Java classes

Java standard library classes available in query strings.

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

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