--- title: Java classes sidebar_label: Java --- Java standard library classes available in query strings. | Type | Name | Signature | Description | | ----- | -------------------------------------- | -------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------- | | CLASS | AbstractCollection | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/AbstractCollection.html) | This class provides a skeletal implementation of the Collection interface, to minimize the effor... | | CLASS | AbstractList | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/AbstractList.html) | This class provides a skeletal implementation of the List interface to minimize the effort requi... | | CLASS | AbstractMap | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/AbstractMap.html) | This class provides a skeletal implementation of the Map interface, to minimize the effort requi... | | CLASS | AbstractMethodError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/AbstractMethodError.html) | Thrown when an application tries to call an abstract method. Normally, this error is caught by t... | | CLASS | AbstractQueue | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/AbstractQueue.html) | This class provides skeletal implementations of some Queue operations. The implementations in th... | | CLASS | AbstractSequentialList | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/AbstractSequentialList.html) | This class provides a skeletal implementation of the List interface to minimize the effort requi... | | CLASS | AbstractSet | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/AbstractSet.html) | This class provides a skeletal implementation of the Set interface to minimize the effort requir... | | CLASS | Appendable | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Appendable.html) | An object to which char sequences and values can be appended. The Appendable interface must be ... | | CLASS | ArithmeticException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ArithmeticException.html) | Thrown when an exceptional arithmetic condition has occurred. For example, an integer "divide by... | | CLASS | Array | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/reflect/Array.html) | The Array class provides static methods to dynamically create and access Java arrays. Array pe... | | CLASS | ArrayDeque | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/ArrayDeque.html) | Resizable-array implementation of the Deque interface. Array deques have no capacity restrictio... | | CLASS | ArrayIndexOutOfBoundsException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ArrayIndexOutOfBoundsException.html) | Thrown to indicate that an array has been accessed with an illegal index. The index is either ne... | | CLASS | ArrayList | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/ArrayList.html) | Resizable-array implementation of the List interface. Implements all optional list operations, ... | | CLASS | ArrayStoreException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ArrayStoreException.html) | Thrown to indicate that an attempt has been made to store the wrong type of object into an array... | | CLASS | Arrays | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Arrays.html) | This class contains various methods for manipulating arrays (such as sorting and searching). Thi... | | CLASS | AssertionError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/AssertionError.html) | Thrown to indicate that an assertion has failed. The seven one-argument public constructors pro... | | CLASS | AutoCloseable | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/AutoCloseable.html) | An object that may hold resources (such as file or socket handles) until it is closed. The close... | | CLASS | Base64 | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Base64.html) | This class consists exclusively of static methods for obtaining encoders and decoders for the Ba... | | CLASS | BitSet | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/BitSet.html) | This class implements a vector of bits that grows as needed. Each component of the bit set has a... | | CLASS | Boolean | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Boolean.html) | The Boolean class wraps a value of the primitive type boolean in an object. An object of type B... | | CLASS | BootstrapMethodError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/BootstrapMethodError.html) | Thrown to indicate that an invokedynamic instruction or a dynamic constant failed to resolve its... | | CLASS | Byte | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Byte.html) | The Byte class wraps a value of primitive type byte in an object. An object of type Byte contai... | | CLASS | Calendar | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Calendar.html) | The Calendar class is an abstract class that provides methods for converting between a specific ... | | CLASS | CharSequence | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/CharSequence.html) | A CharSequence is a readable sequence of char values. This interface provides uniform, read-only... | | CLASS | Character | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Character.html) | The Character class wraps a value of the primitive type char in an object. An object of class C... | | CLASS | Class | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Class.html) | Instances of the class Class represent classes and interfaces in a running Java application. An ... | | CLASS | ClassCastException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ClassCastException.html) | Thrown to indicate that the code has attempted to cast an object to a subclass of which it is no... | | CLASS | ClassCircularityError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ClassCircularityError.html) | Thrown when the Java Virtual Machine detects a circularity in the superclass hierarchy of a clas... | | CLASS | ClassFormatError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ClassFormatError.html) | Thrown when the Java Virtual Machine attempts to read a class file and determines that the file ... | | CLASS | ClassLoader | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ClassLoader.html) | A class loader is an object that is responsible for loading classes. The class ClassLoader is an... | | CLASS | ClassNotFoundException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ClassNotFoundException.html) | Thrown when an application tries to load in a class through its string name using: The forName... | | CLASS | ClassValue | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ClassValue.html) | Lazily associate a computed value with (potentially) every type. For example, if a dynamic langu... | | CLASS | CloneNotSupportedException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/CloneNotSupportedException.html) | Thrown to indicate that the clone method in class Object has been called to clone an object, but... | | CLASS | Cloneable | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Cloneable.html) | A class implements the Cloneable interface to indicate to the Object.clone() method that it is ... | | CLASS | Collection | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Collection.html) | The root interface in the collection hierarchy. A collection represents a group of objects, kno... | | CLASS | Collections | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Collections.html) | This class consists exclusively of static methods that operate on or return collections. It con... | | CLASS | Comparable | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Comparable.html) | This interface imposes a total ordering on the objects of each class that implements it. This o... | | CLASS | Comparator | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Comparator.html) | A comparison function, which imposes a total ordering on some collection of objects. Comparator... | | CLASS | Compiler | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Compiler.html) | The Compiler class is provided to support Java-to-native-code compilers and related services. By... | | CLASS | ConcurrentHashMap | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/concurrent/ConcurrentHashMap.html) | A hash table supporting full concurrency of retrievals and high expected concurrency for updates... | | CLASS | ConcurrentModificationException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/ConcurrentModificationException.html) | This exception may be thrown by methods that have detected concurrent modification of an object ... | | CLASS | Currency | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Currency.html) | Represents a currency. Currencies are identified by their ISO 4217 currency codes. Visit the I... | | CLASS | Date | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Date.html) | The class Date represents a specific instant in time, with millisecond precision. Prior to JD... | | CLASS | Deprecated | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Deprecated.html) | A program element annotated @Deprecated is one that programmers are discouraged from using. An e... | | CLASS | Deque | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Deque.html) | A linear collection that supports element insertion and removal at both ends. The name deque is... | | CLASS | Dictionary | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Dictionary.html) | The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to ... | | CLASS | Double | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Double.html) | The Double class wraps a value of the primitive type double in an object. An object of type Dou... | | CLASS | DoubleSummaryStatistics | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/DoubleSummaryStatistics.html) | A state object for collecting statistics such as count, min, max, sum, and average. This class... | | CLASS | DuplicateFormatFlagsException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/DuplicateFormatFlagsException.html) | Unchecked exception thrown when duplicate flags are provided in the format specifier. Unless ... | | CLASS | EmptyStackException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/EmptyStackException.html) | Thrown by methods in the Stack class to indicate that the stack is empty. | | CLASS | Enum | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html) | This is the common base class of all Java language enumeration classes. More information about ... | | CLASS | EnumConstantNotPresentException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/EnumConstantNotPresentException.html) | Thrown when an application tries to access an enum constant by name and the enum type contains n... | | CLASS | EnumMap | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/EnumMap.html) | A specialized Map implementation for use with enum type keys. All of the keys in an enum map mu... | | CLASS | EnumSet | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/EnumSet.html) | A specialized Set implementation for use with enum types. All of the elements in an enum set mu... | | CLASS | Enumeration | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Enumeration.html) | An object that implements the Enumeration interface generates a series of elements, one at a tim... | | CLASS | Error | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Error.html) | An Error is a subclass of Throwable that indicates serious problems that a reasonable applicatio... | | CLASS | EventListener | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/EventListener.html) | A tagging interface that all event listener interfaces must extend. | | CLASS | EventListenerProxy | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/EventListenerProxy.html) | An abstract wrapper class for an EventListener class which associates a set of additional parame... | | CLASS | EventObject | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/EventObject.html) | The root class from which all event state objects shall be derived. All Events are construct... | | CLASS | Exception | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Exception.html) | The class Exception and its subclasses are a form of Throwable that indicates conditions that a ... | | CLASS | ExceptionInInitializerError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ExceptionInInitializerError.html) | Signals that an unexpected exception has occurred in a static initializer. An ExceptionInInitial... | | CLASS | Float | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Float.html) | The Float class wraps a value of primitive type float in an object. An object of type Float con... | | CLASS | FormatFlagsConversionMismatchException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/FormatFlagsConversionMismatchException.html) | Unchecked exception thrown when a conversion and flag are incompatible. Unless otherwise speci... | | CLASS | Formattable | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Formattable.html) | The Formattable interface must be implemented by any class that needs to perform custom formatti... | | CLASS | FormattableFlags | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/FormattableFlags.html) | FormattableFlags are passed to the Formattable.formatTo() method and modify the output format for... | | CLASS | Formatter | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Formatter.html) | An interpreter for printf-style format strings. This class provides support for layout justific... | | CLASS | FormatterClosedException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/FormatterClosedException.html) | Unchecked exception thrown when the formatter has been closed. Unless otherwise specified, pas... | | CLASS | FunctionalInterface | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/FunctionalInterface.html) | An informative annotation type used to indicate that an interface type declaration is intended t... | | CLASS | GregorianCalendar | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/GregorianCalendar.html) | GregorianCalendar is a concrete subclass of Calendar and provides the standard calendar system ... | | CLASS | HashMap | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/HashMap.html) | Hash table based implementation of the Map interface. This implementation provides all of the o... | | CLASS | HashSet | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/HashSet.html) | This class implements the Set interface, backed by a hash table (actually a HashMap instance). ... | | CLASS | Hashtable | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Hashtable.html) | This class implements a hash table, which maps keys to values. Any non-null object can be used a... | | CLASS | HexFormat | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/HexFormat.html) | HexFormat converts between bytes and chars and hex-encoded strings which may include additional ... | | CLASS | IdentityHashMap | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/IdentityHashMap.html) | This class implements the Map interface with a hash table, using reference-equality in place of ... | | CLASS | IllegalAccessError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalAccessError.html) | Thrown if an application attempts to access or modify a field, or to call a method that it does ... | | CLASS | IllegalAccessException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalAccessException.html) | An IllegalAccessException is thrown when an application tries to reflectively create an instance... | | CLASS | IllegalArgumentException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalArgumentException.html) | Thrown to indicate that a method has been passed an illegal or inappropriate argument. | | CLASS | IllegalCallerException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalCallerException.html) | Thrown to indicate that a method has been called by an inappropriate caller. | | CLASS | IllegalFormatCodePointException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/IllegalFormatCodePointException.html) | Unchecked exception thrown when a character with an invalid Unicode code point as defined by Cha... | | CLASS | IllegalFormatConversionException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/IllegalFormatConversionException.html) | Unchecked exception thrown when the argument corresponding to the format specifier is of an inco... | | CLASS | IllegalFormatException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/IllegalFormatException.html) | Unchecked exception thrown when a format string contains an illegal syntax or a format specifier... | | CLASS | IllegalFormatFlagsException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/IllegalFormatFlagsException.html) | Unchecked exception thrown when an illegal combination flags is given. Unless otherwise specif... | | CLASS | IllegalFormatPrecisionException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/IllegalFormatPrecisionException.html) | Unchecked exception thrown when the precision is a negative value other than -1, the conversion ... | | CLASS | IllegalFormatWidthException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/IllegalFormatWidthException.html) | Unchecked exception thrown when the format width is a negative value other than -1 or is otherwi... | | CLASS | IllegalMonitorStateException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalMonitorStateException.html) | Thrown to indicate that a thread has attempted to wait on an object's monitor or to notify other... | | CLASS | IllegalStateException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalStateException.html) | Signals that a method has been invoked at an illegal or inappropriate time. In other words, the... | | CLASS | IllegalThreadStateException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalThreadStateException.html) | Thrown to indicate that a thread is not in an appropriate state for the requested operation. See... | | CLASS | IllformedLocaleException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/IllformedLocaleException.html) | Thrown by methods in Locale and Locale.Builder to indicate that an argument is not a well-formed... | | CLASS | IncompatibleClassChangeError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IncompatibleClassChangeError.html) | Thrown when an incompatible class change has occurred to some class definition. The definition o... | | CLASS | IndexOutOfBoundsException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IndexOutOfBoundsException.html) | Thrown to indicate that an index of some sort (such as to an array, to a string, or to a vector)... | | CLASS | InheritableThreadLocal | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/InheritableThreadLocal.html) | This class extends ThreadLocal to provide inheritance of values from parent thread to child thre... | | CLASS | InputMismatchException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/InputMismatchException.html) | Thrown by a Scanner to indicate that the token retrieved does not match the pattern for the expe... | | CLASS | InstantiationError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/InstantiationError.html) | Thrown when an application tries to use the Java new construct to instantiate an abstract class ... | | CLASS | InstantiationException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/InstantiationException.html) | Thrown when an application tries to create an instance of a class using the newInstance method i... | | CLASS | IntSummaryStatistics | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/IntSummaryStatistics.html) | A state object for collecting statistics such as count, min, max, sum, and average. This class... | | CLASS | Integer | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Integer.html) | The Integer class wraps a value of the primitive type int in an object. An object of type Intege... | | CLASS | InternalError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/InternalError.html) | Thrown to indicate some unexpected internal error has occurred in the Java Virtual Machine. | | CLASS | InterruptedException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/InterruptedException.html) | Thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted,... | | CLASS | InvalidPropertiesFormatException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/InvalidPropertiesFormatException.html) | Thrown to indicate that an operation could not complete because the input did not conform to the... | | CLASS | Iterable | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Iterable.html) | Implementing this interface allows an object to be the target of the enhanced for statement (som... | | CLASS | Iterator | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Iterator.html) | An iterator over a collection. Iterator takes the place of Enumeration in the Java Collections ... | | CLASS | LayerInstantiationException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/LayerInstantiationException.html) | Thrown when creating a module layer fails. | | CLASS | LinkageError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/LinkageError.html) | Subclasses of LinkageError indicate that a class has some dependency on another class; however, ... | | CLASS | LinkedHashMap | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/LinkedHashMap.html) | Hash table and linked list implementation of the Map interface, with predictable iteration order... | | CLASS | LinkedHashSet | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/LinkedHashSet.html) | Hash table and linked list implementation of the Set interface, with predictable iteration order... | | CLASS | LinkedList | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/LinkedList.html) | Doubly-linked list implementation of the List and Deque interfaces. Implements all optional lis... | | CLASS | List | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html) | An ordered collection (also known as a sequence). The user of this interface has precise contro... | | CLASS | ListIterator | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/ListIterator.html) | An iterator for lists that allows the programmer to traverse the list in either direction, modif... | | CLASS | ListResourceBundle | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/ListResourceBundle.html) | ListResourceBundle is an abstract subclass of ResourceBundle that manages resources for a locale... | | CLASS | Locale | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Locale.html) | A Locale object represents a specific geographical, political, or cultural region. An operation ... | | CLASS | Long | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Long.html) | The Long class wraps a value of the primitive type long in an object. An object of type Long co... | | CLASS | LongSummaryStatistics | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/LongSummaryStatistics.html) | A state object for collecting statistics such as count, min, max, sum, and average. This class... | | CLASS | Map | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html) | An object that maps keys to values. A map cannot contain duplicate keys; each key can map to at... | | CLASS | Math | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Math.html) | The class Math contains methods for performing basic numeric operations such as the elementary e... | | CLASS | MissingFormatArgumentException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/MissingFormatArgumentException.html) | Unchecked exception thrown when there is a format specifier which does not have a corresponding ... | | CLASS | MissingFormatWidthException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/MissingFormatWidthException.html) | Unchecked exception thrown when the format width is required. Unless otherwise specified, pass... | | CLASS | MissingResourceException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/MissingResourceException.html) | Signals that a resource is missing. | | CLASS | Module | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Module.html) | Represents a run-time module, either named or unnamed. Named modules have a name and are const... | | CLASS | ModuleLayer | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ModuleLayer.html) | A layer of modules in the Java virtual machine. A layer is created from a graph of modules in ... | | CLASS | NavigableMap | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/NavigableMap.html) | A SortedMap extended with navigation methods returning the closest matches for given search targ... | | CLASS | NavigableSet | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/NavigableSet.html) | A SortedSet extended with navigation methods reporting closest matches for given search targets.... | | CLASS | NegativeArraySizeException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/NegativeArraySizeException.html) | Thrown if an application tries to create an array with negative size. | | CLASS | NoClassDefFoundError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/NoClassDefFoundError.html) | Thrown if the Java Virtual Machine or a ClassLoader instance tries to load in the definition of ... | | CLASS | NoSuchElementException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/NoSuchElementException.html) | Thrown by various accessor methods to indicate that the element being requested does not exist. | | CLASS | NoSuchFieldError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/NoSuchFieldError.html) | Thrown if an application tries to access or modify a specified field of an object, and that obje... | | CLASS | NoSuchFieldException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/NoSuchFieldException.html) | Signals that the class doesn't have a field of a specified name. | | CLASS | NoSuchMethodError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/NoSuchMethodError.html) | Thrown if an application tries to call a specified method of a class (either static or instance)... | | CLASS | NoSuchMethodException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/NoSuchMethodException.html) | Thrown when a particular method cannot be found. | | CLASS | NullPointerException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/NullPointerException.html) | Thrown when an application attempts to use null in a case where an object is required. These inc... | | CLASS | Number | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Number.html) | The abstract class Number is the superclass of platform classes representing numeric values that... | | CLASS | NumberFormatException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/NumberFormatException.html) | Thrown to indicate that the application has attempted to convert a string to one of the numeric ... | | CLASS | Object | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html) | Class Object is the root of the class hierarchy. Every class has Object as a superclass. All obj... | | CLASS | Objects | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Objects.html) | This class consists of static utility methods for operating on objects, or checking certain cond... | | CLASS | Observable | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Observable.html) | This class represents an observable object, or "data" in the model-view paradigm. It can be subc... | | CLASS | Observer | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Observer.html) | A class can implement the Observer interface when it wants to be informed of changes in observab... | | CLASS | Optional | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Optional.html) | A container object which may or may not contain a non-null value. If a value is present, isPrese... | | CLASS | OptionalDouble | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/OptionalDouble.html) | A container object which may or may not contain a double value. If a value is present, isPresent... | | CLASS | OptionalInt | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/OptionalInt.html) | A container object which may or may not contain an int value. If a value is present, isPresent()... | | CLASS | OptionalLong | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/OptionalLong.html) | A container object which may or may not contain a long value. If a value is present, isPresent()... | | CLASS | OutOfMemoryError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/OutOfMemoryError.html) | Thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and ... | | CLASS | Override | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Override.html) | Indicates that a method declaration is intended to override a method declaration in a supertype.... | | CLASS | Package | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Package.html) | Represents metadata about a run-time package associated with a class loader. Metadata includes a... | | CLASS | PrimitiveIterator | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/PrimitiveIterator.html) | A base type for primitive specializations of Iterator. Specialized subtypes are provided for in... | | CLASS | PriorityQueue | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/PriorityQueue.html) | An unbounded priority queue based on a priority heap. The elements of the priority queue are ord... | | CLASS | Process | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Process.html) | Process provides control of native processes started by ProcessBuilder.start and Runtime.exec. ... | | CLASS | ProcessBuilder | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ProcessBuilder.html) | This class is used to create operating system processes. Each ProcessBuilder instance manages a... | | CLASS | ProcessHandle | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ProcessHandle.html) | ProcessHandle identifies and provides control of native processes. Each individual process can b... | | CLASS | Properties | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Properties.html) | The Properties class represents a persistent set of properties. The Properties can be saved to a... | | CLASS | PropertyPermission | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/PropertyPermission.html) | This class is for property permissions. The name is the name of the property ("java.home", "... | | CLASS | PropertyResourceBundle | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/PropertyResourceBundle.html) | PropertyResourceBundle is a concrete subclass of ResourceBundle that manages resources for a loc... | | CLASS | Queue | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Queue.html) | A collection designed for holding elements prior to processing. Besides basic Collection operati... | | CLASS | Random | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Random.html) | An instance of this class is used to generate a stream of pseudorandom numbers; its period is on... | | CLASS | RandomAccess | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/RandomAccess.html) | Marker interface used by List implementations to indicate that they support fast (generally cons... | | CLASS | Readable | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Readable.html) | A Readable is a source of characters. Characters from a Readable are made available to callers o... | | CLASS | Record | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Record.html) | This is the common base class of all Java language record classes. More information about recor... | | CLASS | ReflectiveOperationException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ReflectiveOperationException.html) | Common superclass of exceptions thrown by reflective operations in core reflection. | | CLASS | ResourceBundle | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/ResourceBundle.html) | Resource bundles contain locale-specific objects. When your program needs a locale-specific res... | | CLASS | Runnable | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Runnable.html) | The Runnable interface should be implemented by any class whose instances are intended to be exe... | | CLASS | Runtime | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Runtime.html) | Every Java application has a single instance of class Runtime that allows the application to int... | | CLASS | RuntimeException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html) | RuntimeException is the superclass of those exceptions that can be thrown during the normal oper... | | CLASS | RuntimePermission | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimePermission.html) | This class is for runtime permissions. A RuntimePermission contains a name (also referred to as ... | | CLASS | SafeVarargs | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/SafeVarargs.html) | A programmer assertion that the body of the annotated method or constructor does not perform pot... | | CLASS | Scanner | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Scanner.html) | A simple text scanner which can parse primitive types and strings using regular expressions. A... | | CLASS | SecurityException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/SecurityException.html) | Thrown by the security manager to indicate a security violation. | | CLASS | SecurityManager | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/SecurityManager.html) | The security manager is a class that allows applications to implement a security policy. It allo... | | CLASS | ServiceConfigurationError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/ServiceConfigurationError.html) | Error thrown when something goes wrong while locating, loading, or instantiating a service provi... | | CLASS | ServiceLoader | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/ServiceLoader.html) | A facility to load implementations of a service. A service is a well-known interface or class ... | | CLASS | Set | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Set.html) | A collection that contains no duplicate elements. More formally, sets contain no pair of elemen... | | CLASS | Short | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Short.html) | The Short class wraps a value of primitive type short in an object. An object of type Short co... | | CLASS | SimpleTimeZone | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/SimpleTimeZone.html) | SimpleTimeZone is a concrete subclass of TimeZone that represents a time zone for use with a Gre... | | CLASS | SortedMap | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/SortedMap.html) | A Map that further provides a total ordering on its keys. The map is ordered according to the na... | | CLASS | SortedSet | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/SortedSet.html) | A Set that further provides a total ordering on its elements. The elements are ordered using the... | | CLASS | Spliterator | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Spliterator.html) | An object for traversing and partitioning elements of a source. The source of elements covered ... | | CLASS | Spliterators | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Spliterators.html) | Static classes and methods for operating on or creating instances of Spliterator and its primiti... | | CLASS | SplittableRandom | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/SplittableRandom.html) | A generator of uniform pseudorandom values (with period 264) applicable for use in (among other ... | | CLASS | Stack | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Stack.html) | The Stack class represents a last-in-first-out (LIFO) stack of objects. It extends class Vector ... | | CLASS | StackOverflowError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/StackOverflowError.html) | Thrown when a stack overflow occurs because an application recurses too deeply. | | CLASS | StackTraceElement | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/StackTraceElement.html) | An element in a stack trace, as returned by Throwable.getStackTrace(). Each element represents a... | | CLASS | StackWalker | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/StackWalker.html) | A stack walker. The walk method opens a sequential stream of StackFrames for the current thre... | | CLASS | StrictMath | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/StrictMath.html) | The class StrictMath contains methods for performing basic numeric operations such as the elemen... | | CLASS | String | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html) | The String class represents character strings. All string literals in Java programs, such as "ab... | | CLASS | StringBuffer | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/StringBuffer.html) | A thread-safe, mutable sequence of characters. A string buffer is like a String, but can be modi... | | CLASS | StringBuilder | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/StringBuilder.html) | A mutable sequence of characters. This class provides an API compatible with StringBuffer, but ... | | CLASS | StringIndexOutOfBoundsException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/StringIndexOutOfBoundsException.html) | Thrown by String methods to indicate that an index is either negative or greater than the size o... | | CLASS | StringJoiner | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/StringJoiner.html) | StringJoiner is used to construct a sequence of characters separated by a delimiter and optional... | | CLASS | StringTokenizer | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/StringTokenizer.html) | The string tokenizer class allows an application to break a string into tokens. The tokenization... | | CLASS | SuppressWarnings | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/SuppressWarnings.html) | Indicates that the named compiler warnings should be suppressed in the annotated element (and in... | | CLASS | System | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/System.html) | The System class contains several useful class fields and methods. It cannot be instantiated. ... | | CLASS | Thread | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Thread.html) | A thread is a thread of execution in a program. The Java Virtual Machine allows an application t... | | CLASS | ThreadDeath | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ThreadDeath.html) | An instance of ThreadDeath is thrown in the victim thread when the (deprecated) Thread.stop() me... | | CLASS | ThreadGroup | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ThreadGroup.html) | A thread group represents a set of threads. In addition, a thread group can also include other t... | | CLASS | ThreadLocal | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ThreadLocal.html) | This class provides thread-local variables. These variables differ from their normal counterpar... | | CLASS | Throwable | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Throwable.html) | The Throwable class is the superclass of all errors and exceptions in the Java language. Only ob... | | CLASS | TimeZone | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/TimeZone.html) | TimeZone represents a time zone offset, and also figures out daylight savings. Typically, yo... | | CLASS | Timer | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Timer.html) | A facility for threads to schedule tasks for future execution in a background thread. Tasks may... | | CLASS | TimerTask | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/TimerTask.html) | A task that can be scheduled for one-time or repeated execution by a Timer. A timer task is no... | | CLASS | TooManyListenersException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/TooManyListenersException.html) | The TooManyListenersException Exception is used as part of the Java Event model to annotate ... | | CLASS | TreeMap | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/TreeMap.html) | A Red-Black tree based NavigableMap implementation. The map is sorted according to the natural ... | | CLASS | TreeSet | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/TreeSet.html) | A NavigableSet implementation based on a TreeMap. The elements are ordered using their natural ... | | CLASS | TypeNotPresentException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/TypeNotPresentException.html) | Thrown when an application tries to access a type using a string representing the type's name, b... | | CLASS | UUID | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/UUID.html) | A class that represents an immutable universally unique identifier (UUID). A UUID represents a 1... | | CLASS | UnknownError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/UnknownError.html) | Thrown when an unknown but serious exception has occurred in the Java Virtual Machine. | | CLASS | UnknownFormatConversionException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/UnknownFormatConversionException.html) | Unchecked exception thrown when an unknown conversion is given. Unless otherwise specified, pa... | | CLASS | UnknownFormatFlagsException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/UnknownFormatFlagsException.html) | Unchecked exception thrown when an unknown flag is given. Unless otherwise specified, passing ... | | CLASS | UnsatisfiedLinkError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/UnsatisfiedLinkError.html) | Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a me... | | CLASS | UnsupportedClassVersionError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/UnsupportedClassVersionError.html) | Thrown when the Java Virtual Machine attempts to read a class file and determines that the major... | | CLASS | UnsupportedOperationException | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/UnsupportedOperationException.html) | Thrown to indicate that the requested operation is not supported. This class is a member of the... | | CLASS | Vector | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Vector.html) | The Vector class implements a growable array of objects. Like an array, it contains components t... | | CLASS | VerifyError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/VerifyError.html) | Thrown when the "verifier" detects that a class file, though well formed, contains some sort of ... | | CLASS | VirtualMachineError | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/VirtualMachineError.html) | Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary... | | CLASS | Void | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Void.html) | The Void class is an uninstantiable placeholder class to hold a reference to the Class object re... | | CLASS | WeakHashMap | [None](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/WeakHashMap.html) | Hash table based implementation of the Map interface, with weak keys. An entry in a WeakHashMap... | ## Related documentation - [Auto-imported functions](./index.md)