Uses of Class
java.lang.Object

Packages that use Object

Package	Description
java.io
java.lang
java.lang.annotation
java.lang.invoke
java.lang.ref
java.lang.reflect
java.net
java.nio.charset
java.text
java.util
java.util.concurrent

Uses of Object in java.io

Subclasses of Object in java.io

Modifier and Type	Class and Description
class	ByteArrayInputStream A ByteArrayInputStream contains an internal buffer that contains bytes that may be read from the stream.
class	ByteArrayOutputStream This class implements an output stream in which the data is written into a byte array.
class	DataInputStream A data input stream lets an application read primitive Java data types from an underlying input stream in a machine-independent way.
class	DataOutputStream A data output stream lets an application write primitive Java data types to an output stream in a portable way.
class	EOFException Signals that an end of file or end of stream has been reached unexpectedly during input.
class	InputStream This abstract class is the superclass of all classes representing an input stream of bytes.
class	InputStreamReader An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and translates them into characters.
class	InterruptedIOException Signals that an I/O operation has been interrupted.
class	IOException Signals that an I/O exception of some sort has occurred.
class	OutputStream This abstract class is the superclass of all classes representing an output stream of bytes.
class	OutputStreamWriter An OutputStreamWriter is a bridge from character streams to byte streams: Characters written to it are translated into bytes.
class	PrintStream A PrintStream adds functionality to another output stream, namely the ability to print representations of various data values conveniently.
class	Reader Abstract class for reading character streams.
class	StringReader A specialized Reader that reads characters from a String in a sequential manner.
class	StringWriter
class	UnsupportedEncodingException The Character Encoding is not supported.
class	UTFDataFormatException Signals that a malformed UTF-8 string has been read in a data input stream or by any class that implements the data input interface.
class	Writer Abstract class for writing to character streams.

Fields in java.io declared as Object

Modifier and Type	Field and Description
protected Object	Writer.lock The object used to synchronize operations on this stream.
protected Object	Reader.lock The object used to synchronize operations on this stream.

Methods in java.io with parameters of type Object

Modifier and Type	Method and Description
void	PrintStream.print(Object obj) Print an object.
void	PrintStream.println(Object x) Print an Object and then terminate the line.

Constructors in java.io with parameters of type Object

Constructor and Description
Reader(Object lock) Create a new character-stream reader whose critical sections will synchronize on the given object.
Writer(Object lock) Create a new character-stream writer whose critical sections will synchronize on the given object.

Uses of Object in java.lang

Subclasses of Object in java.lang

Modifier and Type	Class and Description
class	AbstractMethodError Exception thrown when an attempt is made to call an abstract method.
class	ArithmeticException Thrown when an exceptional arithmetic condition has occurred.
class	ArrayIndexOutOfBoundsException Thrown to indicate that an array has been accessed with an illegal index.
class	ArrayStoreException Thrown to indicate that an attempt has been made to store the wrong type of object into an array of objects.
class	AssertionError
class	Boolean The Boolean class wraps a value of the primitive type boolean in an object.
class	Byte The Byte class is the standard wrapper for byte values.
class	Character The Character class wraps a value of the primitive type char in an object.
class	Class<T> Instances of the class Class represent classes and interfaces in a running Java application.
class	ClassCastException Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.
class	ClassLoader
class	ClassNotFoundException Thrown when an application tries to load in a class through its string name using the forName method in class Class but no definition for the class with the specified name could be found.
class	CloneNotSupportedException Thrown when a program attempts to clone an object which does not support the Cloneable interface.
class	Double The Double class wraps a value of the primitive type double in an object.
class	Enum<E extends Enum<E>> Implementation class required to compile enums
class	Error An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch.
class	Exception The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.
class	Float The Float class wraps a value of primitive type float in an object.
class	IllegalAccessException Thrown when an application tries to load in a class, but the currently executing method does not have access to the definition of the specified class, because the class is not public and in another package.
class	IllegalArgumentException Thrown to indicate that a method has been passed an illegal or inappropriate argument.
class	IllegalMonitorStateException Thrown to indicate that a thread has attempted to wait on an object's monitor or to notify other threads waiting on an object's monitor without owning the specified monitor.
class	IllegalStateException
class	IllegalThreadStateException Thrown to indicate that a thread is not in an appropriate state for the requested operation.
class	IncompatibleClassChangeError IncompatibleClassChangeError is the superclass of all classes which represent errors that occur when inconsistent class files are loaded into the same running image.
class	IndexOutOfBoundsException Thrown to indicate that an index of some sort (such as to an array, to a string, or to a vector) is out of range.
class	InstantiationException Thrown when an application tries to create an instance of a class using the newInstance method in class Class, but the specified class object cannot be instantiated because it is an interface or is an abstract class.
class	Integer The Integer class wraps a value of the primitive type int in an object.
class	InterruptedException Thrown when a thread is waiting, sleeping, or otherwise paused for a long time and another thread interrupts it.
class	LinkageError LinkageError is the superclass of all error classes that occur when loading and linking class files.
class	Long The Long class wraps a value of the primitive type long in an object.
class	Math The class Math contains methods for performing basic numeric operations.
class	NegativeArraySizeException Thrown if an application tries to create an array with negative size.
class	NoClassDefFoundError Thrown if the Java Virtual Machine tries to load in the definition of a class (as part of a normal method call or as part of creating a new instance using the new expression) and no definition of the class could be found.
class	NoSuchFieldError Thrown when the virtual machine notices that a program tries to reference, on a class or object, a field that does not exist.
class	NullPointerException Thrown when an application attempts to use null in a case where an object is required.
class	Number
class	NumberFormatException Thrown to indicate that the application has attempted to convert a string to one of the numeric types, but that the string does not have the appropriate format.
class	OutOfMemoryError Thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and no more memory could be made available by the garbage collector.
class	Runtime Every Java application has a single instance of class Runtime that allows the application to interface with the environment in which the application is running.
class	RuntimeException RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.
class	SecurityException Thrown by the system to indicate a security violation.
class	Short The Short class is the standard wrapper for short values.
class	StackTraceElement
class	String The String class represents character strings.
class	StringBuffer A string buffer implements a mutable sequence of characters.
class	StringBuilder A string builder implements a mutable sequence of characters.
class	StringIndexOutOfBoundsException Thrown by the charAt method in class String and by other String methods to indicate that an index is either negative or greater than or equal to the size of the string.
class	System The System class contains several useful class fields and methods.
class	Thread A thread is a thread of execution in a program.
class	ThreadLocal<T>
class	Throwable The Throwable class is the superclass of all errors and exceptions in the Java language.
class	UnsupportedOperationException
class	VirtualMachineError Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.
class	Void

Methods in java.lang that return Object

Modifier and Type	Method and Description
Object	Class.cast(Object object) Replacement for Class.cast(Object).
protected Object	Object.clone()
protected Object	Enum.clone()
protected static <T> T[]	Enum.getEnumValues(Class<T> class_)
Object	Class.newInstance() Creates a new instance of a class.

Methods in java.lang with parameters of type Object

Modifier and Type	Method and Description
StringBuilder	StringBuilder.append(Object obj) Appends the string representation of the Object argument to this string builder.
StringBuffer	StringBuffer.append(Object obj) Appends the string representation of the Object argument to this string buffer.
static void	System.arraycopy(Object src, int srcOffset, Object dst, int dstOffset, int length) Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.
Object	Class.cast(Object object) Replacement for Class.cast(Object).
boolean	String.equals(Object anObject) Compares this string to the specified object.
boolean	Short.equals(Object obj) Compares this object to the specified object.
boolean	Object.equals(Object obj) Indicates whether some other object is "equal to" this one.
boolean	Long.equals(Object obj) Compares this object against the specified object.
boolean	Integer.equals(Object obj) Compares this object to the specified object.
boolean	Float.equals(Object obj) Compares this object against some other object.
boolean	Enum.equals(Object other)
boolean	Double.equals(Object obj) Compares this object against the specified object.
boolean	Character.equals(Object obj) Compares this object against the specified object.
boolean	Byte.equals(Object obj) Compares this object to the specified object.
boolean	Boolean.equals(Object obj) Returns true if and only if the argument is not null and is a Boolean object that represents the same boolean value as this object.
static int	System.identityHashCode(Object x) Returns the same hashcode for the given object as would be returned by the default method hashCode(), whether or not the given object's class overrides hashCode().
StringBuilder	StringBuilder.insert(int offset, Object obj) Inserts the string representation of the Object argument into this string builder.
StringBuffer	StringBuffer.insert(int offset, Object obj) Inserts the string representation of the Object argument into this string buffer.
boolean	Class.isInstance(Object obj) Determines if the specified Object is assignment-compatible with the object represented by this Class.
protected static void	Enum.setEnumValues(Object[] values, Class c)
static String	String.valueOf(Object obj) Returns the string representation of the Object argument.

Constructors in java.lang with parameters of type Object

Constructor and Description
AssertionError(Object detailMessage)

Uses of Object in java.lang.annotation

Subclasses of Object in java.lang.annotation

Modifier and Type	Class and Description
class	AnnotationFormatError A mirror of java.lang.annotation.AnnotationFormatError.
class	IncompleteAnnotationException A mirror of java.lang.annotation.IncompleteAnnotationException.

Methods in java.lang.annotation with parameters of type Object

Modifier and Type	Method and Description
boolean	Annotation.equals(Object obj) Returns true if the specified object represents an annotation that is logically equivalent to this one.

Uses of Object in java.lang.invoke

Subclasses of Object in java.lang.invoke

Modifier and Type	Class and Description
class	CallSite Deprecated. these classes are used internally for Lambda compatibility
class	LambdaMetafactory Deprecated. these classes are used internally for Lambda compatibility
class	MethodHandle Deprecated. these classes are used internally for Lambda compatibility
class	MethodHandles Deprecated. these classes are used internally for Lambda compatibility
static class	MethodHandles.Lookup Deprecated.
class	MethodType Deprecated. these classes are used internally for Lambda compatibility

Methods in java.lang.invoke that return Object

Modifier and Type	Method and Description
Object	MethodHandle.invoke(Object... a) Deprecated.
Object	MethodHandle.invokeExact(Object... a) Deprecated.
Object	MethodHandle.invokeWithArguments(List<?> a) Deprecated.
Object	MethodHandle.invokeWithArguments(Object... a) Deprecated.

Methods in java.lang.invoke with parameters of type Object

Modifier and Type	Method and Description
static CallSite	LambdaMetafactory.altMetafactory(MethodHandles.Lookup a, String b, MethodType c, Object... d) Deprecated.
MethodHandle	MethodHandles.Lookup.bind(Object a, String b, MethodType c)
MethodHandle	MethodHandle.bindTo(Object a) Deprecated.
static MethodHandle	MethodHandles.constant(Class<?> a, Object b) Deprecated.
static MethodHandle	MethodHandles.insertArguments(MethodHandle a, int b, Object... c) Deprecated.
Object	MethodHandle.invoke(Object... a) Deprecated.
Object	MethodHandle.invokeExact(Object... a) Deprecated.
Object	MethodHandle.invokeWithArguments(Object... a) Deprecated.
MethodHandle	MethodHandles.Lookup.unreflect(Object a)
MethodHandle	MethodHandles.Lookup.unreflectConstructor(Object a)
MethodHandle	MethodHandles.Lookup.unreflectGetter(Object a)
MethodHandle	MethodHandles.Lookup.unreflectSetter(Object a)
MethodHandle	MethodHandles.Lookup.unreflectSpecial(Object a, Class<?> b)

Uses of Object in java.lang.ref

Subclasses of Object in java.lang.ref

Modifier and Type	Class and Description
class	Reference Abstract base class for reference objects.
class	WeakReference This class provides support for weak references.

Methods in java.lang.ref that return Object

Modifier and Type	Method and Description
Object	Reference.get() Returns this reference object's referent.

Constructors in java.lang.ref with parameters of type Object

Constructor and Description
WeakReference(Object ref) Creates a new weak reference that refers to the given object.

Uses of Object in java.lang.reflect

Subclasses of Object in java.lang.reflect

Modifier and Type	Class and Description
class	Array Added this for Kotlin
class	Constructor
class	Method

Methods in java.lang.reflect that return Object

Modifier and Type	Method and Description
static Object	Array.newInstance(Class<?> componentType, int length)
static Object	Array.newInstance(Class<?> componentType, int[] dimensions)

Uses of Object in java.net

Subclasses of Object in java.net

Modifier and Type	Class and Description
class	URI An implementation of a Univeral Resource Identifier (URI).
class	URISyntaxException

Methods in java.net with parameters of type Object

Modifier and Type	Method and Description
boolean	URI.equals(Object that)

Uses of Object in java.nio.charset

Subclasses of Object in java.nio.charset

Modifier and Type	Class and Description
class	Charset Added this for Kotlin

Uses of Object in java.text

Subclasses of Object in java.text

Modifier and Type	Class and Description
class	DateFormat Deprecated. this class has many issues in iOS and other platforms, please use the L10NManager
class	DateFormatPatterns Common patterns for dates, times, and timestamps.
class	DateFormatSymbols
class	Format An abstract class for parsing and formatting localisation sensitive information, compatible with JDK 6.
class	ParseException An error occurred during parsing.
class	SimpleDateFormat Deprecated. this class has many issues in iOS and other platforms, please use the L10NManager

Methods in java.text that return Object

Modifier and Type	Method and Description
Object	SimpleDateFormat.clone() Deprecated.
Object	DateFormatSymbols.clone()
Object	DateFormat.clone() Deprecated.
abstract Object	Format.parseObject(String source) Parse an string to an object.
Object	DateFormat.parseObject(String source) Deprecated. NOT IMPLEMENTED - use SimpleDateFormat for parsing instead.

Methods in java.text with parameters of type Object

Modifier and Type	Method and Description
boolean	DateFormat.equals(Object obj) Deprecated.
abstract String	Format.format(Object source) Format an object.
String	DateFormat.format(Object obj) Deprecated. Format a given object.

Uses of Object in java.util

Subclasses of Object in java.util

Modifier and Type	Class and Description
class	AbstractCollection<E> Class AbstractCollection is an abstract implementation of the Collection interface.
class	AbstractList<E> AbstractList is an abstract implementation of the List interface, optimized for a backing store which supports random access.
class	AbstractMap<K,V> This class is an abstract implementation of the Map interface.
static class	AbstractMap.SimpleEntry<K,V> A key-value mapping.
static class	AbstractMap.SimpleImmutableEntry<K,V> An immutable key-value mapping.
class	AbstractQueue<E> AbstractQueue is an abstract class which implements some of the methods in Queue.
class	AbstractSequentialList<E> AbstractSequentialList is an abstract implementation of the List interface.
class	AbstractSet<E> An AbstractSet is an abstract implementation of the Set interface.
class	ArrayDeque<E> An implementation of Deque, backed by an array.
class	ArrayList<E> ArrayList is an implementation of List, backed by an array.
class	Arrays Arrays contains static methods which operate on arrays.
class	BitSet The BitSet class implements a bit field.
class	Calendar Calendar is an abstract base class for converting between a Date object and a set of integer fields such as YEAR, MONTH, DAY, HOUR, and so on.
class	Collections Collections contains static methods which operate on Collection classes.
class	ConcurrentModificationException An ConcurrentModificationException is thrown when a Collection is modified and an existing iterator on the Collection is used to modify the Collection as well.
class	Date The class Date represents a specific instant in time, with millisecond precision.
class	Dictionary<K,V> Note: Do not use this class since it is obsolete.
class	EmptyStackException Thrown by methods in the Stack class to indicate that the stack is empty.
class	EventListenerProxy This abstract class provides a simple wrapper for objects of type EventListener.
class	HashMap<K,V> HashMap is an implementation of Map.
class	HashSet<E> HashSet is an implementation of a Set.
class	Hashtable<K,V> Hashtable associates keys with values.
class	IdentityHashMap<K,V> IdentityHashMap is a variant on HashMap which tests equality by reference instead of equality by value.
class	LinkedHashMap<K,V> LinkedHashMap is a variant of HashMap.
class	LinkedHashSet<E> LinkedHashSet is a variant of HashSet.
class	LinkedList<E> LinkedList is an implementation of List, backed by a linked list.
class	Locale
class	NoSuchElementException Thrown by the nextElement method of an Enumeration to indicate that there are no more elements in the enumeration.
class	Objects This is a compatibility class which supports the java.util.Objects API.
class	Observable Observable is used to notify a group of Observer objects when a change occurs.
class	PriorityQueue<E> A PriorityQueue holds elements on a priority heap, which orders the elements according to their natural order or according to the comparator specified at construction time.
class	Random An instance of this class is used to generate a stream of pseudorandom numbers.
class	Stack<E> Stack is a Last-In/First-Out(LIFO) data structure which represents a stack of objects.
class	StringTokenizer The StringTokenizer class allows an application to break a string into tokens by performing code point comparison.
class	Timer
class	TimerTask
class	TimeZone TimeZone represents a time zone offset, and also figures out daylight savings.
class	TreeMap<K,V> TreeMap is an implementation of SortedMap.
class	TreeSet<E> TreeSet is an implementation of SortedSet.
class	Vector<E> Vector is a variable size contiguous indexable array of objects.

Fields in java.util declared as Object

Modifier and Type	Field and Description
protected Object[]	Vector.elementData The elements of the vector.

Methods in java.util with type parameters of type Object

Modifier and Type	Method and Description
static <T extends Object & Comparable<? super T>> T	Collections.max(Collection<? extends T> collection) Searches the specified collection for the maximum element.
static <T extends Object & Comparable<? super T>> T	Collections.min(Collection<? extends T> collection) Searches the specified collection for the minimum element.

Methods in java.util that return Object

Modifier and Type	Method and Description
static <T> T[]	Arrays.copyOf(T[] original, int newLength)
static <T> T[]	Arrays.copyOf(T[] original, int newLength, Class<? extends T[]> newType)
static <T> T[]	Arrays.copyOfRange(T[] original, int from, int to)
static <T,U> T[]	Arrays.copyOfRange(U[] original, int from, int to, Class<? extends T[]> newType)
Object	StringTokenizer.nextElement() Returns the next token in the string as an Object.
Object[]	Vector.toArray() Returns a new array containing all elements contained in this vector.
Object[]	Set.toArray() Returns an array containing all elements contained in this set.
Object[]	PriorityQueue.toArray() Returns all the elements in an array.
Object[]	List.toArray() Returns an array containing all elements contained in this List.
Object[]	LinkedList.toArray() Returns a new array containing all elements contained in this LinkedList.
Object[]	Collection.toArray() Returns a new array containing all elements contained in this Collection.
Object[]	ArrayList.toArray() Returns a new array containing all elements contained in this ArrayList.
Object[]	AbstractList.toArray() Returns a new array containing all elements contained in this ArrayList.
Object[]	AbstractCollection.toArray() Returns a new array containing all elements contained in this ArrayList.
<T> T[]	Vector.toArray(T[] contents) Returns an array containing all elements contained in this vector.
<T> T[]	Set.toArray(T[] array) Returns an array containing all elements contained in this set.
<T> T[]	PriorityQueue.toArray(T[] array) Returns all the elements in an array, and the type of the result array is the type of the argument array.
<T> T[]	List.toArray(T[] array) Returns an array containing all elements contained in this List.
<T> T[]	LinkedList.toArray(T[] contents) Returns an array containing all elements contained in this LinkedList.
<T> T[]	Collection.toArray(T[] array) Returns an array containing all elements contained in this Collection.
<T> T[]	ArrayList.toArray(T[] contents) Returns an array containing all elements contained in this ArrayList.
<T> T[]	AbstractList.toArray(T[] contents) Returns an array containing all elements contained in this ArrayList.
<T> T[]	AbstractCollection.toArray(T[] contents) Returns an array containing all elements contained in this ArrayList.

Methods in java.util with parameters of type Object

Modifier and Type	Method and Description
static <T> boolean	Collections.addAll(Collection<? super T> c, T... a) Adds all the specified elements to the specified collection.
boolean	Calendar.after(Object when) Compares the time field records.
static <T> List<T>	Arrays.asList(T... array) Returns a List of the objects in the specified array.
boolean	Calendar.before(Object when) Compares the time field records.
static int	Arrays.binarySearch(Object[] array, int startIndex, int endIndex, Object object) Performs a binary search for the specified element in a part of the specified sorted array.
static int	Arrays.binarySearch(Object[] array, int startIndex, int endIndex, Object object) Performs a binary search for the specified element in a part of the specified sorted array.
static int	Arrays.binarySearch(Object[] array, Object object) Performs a binary search for the specified element in the specified sorted array.
static int	Arrays.binarySearch(Object[] array, Object object) Performs a binary search for the specified element in the specified sorted array.
static <T> int	Arrays.binarySearch(T[] array, int startIndex, int endIndex, T object, Comparator<? super T> comparator) Performs a binary search for the specified element in a part of the specified sorted array using the Comparator to compare elements.
static <T> int	Arrays.binarySearch(T[] array, T object, Comparator<? super T> comparator) Performs a binary search for the specified element in the specified sorted array using the Comparator to compare elements.
boolean	Vector.contains(Object object) Searches this vector for the specified object.
boolean	TreeSet.contains(Object object) Searches this TreeSet for the specified object.
boolean	Set.contains(Object object) Searches this set for the specified object.
boolean	PriorityQueue.contains(Object object) Answers if there is an element in this queue equals to the object.
boolean	List.contains(Object object) Tests whether this List contains the specified object.
boolean	LinkedList.contains(Object object) Searches this LinkedList for the specified object.
boolean	Hashtable.contains(Object value) Returns true if this Hashtable contains the specified object as the value of at least one of the key/value pairs.
boolean	HashSet.contains(Object object) Searches this HashSet for the specified object.
boolean	Collection.contains(Object object) Tests whether this Collection contains the specified object.
boolean	ArrayList.contains(Object object) Searches this ArrayList for the specified object.
boolean	ArrayDeque.contains(Object obj) Returns true if the specified element is in the deque.
boolean	AbstractCollection.contains(Object object) Tests whether this Collection contains the specified object.
boolean	TreeMap.containsKey(Object key) Returns whether this map contains the specified key.
boolean	Map.containsKey(Object key) Returns whether this Map contains the specified key.
boolean	IdentityHashMap.containsKey(Object key) Returns whether this map contains the specified key.
boolean	Hashtable.containsKey(Object key) Returns true if this Hashtable contains the specified object as a key of one of the key/value pairs.
boolean	HashMap.containsKey(Object key) Returns whether this map contains the specified key.
boolean	AbstractMap.containsKey(Object key) Returns whether this map contains the specified key.
boolean	TreeMap.containsValue(Object value) Returns whether this map contains the specified value.
boolean	Map.containsValue(Object value) Returns whether this Map contains the specified value.
boolean	LinkedHashMap.containsValue(Object value)
boolean	IdentityHashMap.containsValue(Object value) Returns whether this map contains the specified value.
boolean	Hashtable.containsValue(Object value) Searches this Hashtable for the specified value.
boolean	HashMap.containsValue(Object value) Returns whether this map contains the specified value.
boolean	AbstractMap.containsValue(Object value) Returns whether this map contains the specified value.
void	Vector.copyInto(Object[] elements) Attempts to copy elements contained by this Vector into the corresponding elements of the supplied Object array.
static <T> T[]	Arrays.copyOf(T[] original, int newLength)
static <T> T[]	Arrays.copyOf(T[] original, int newLength, Class<? extends T[]> newType)
static <T> T[]	Arrays.copyOfRange(T[] original, int from, int to)
static <T,U> T[]	Arrays.copyOfRange(U[] original, int from, int to, Class<? extends T[]> newType)
static boolean	Arrays.deepEquals(Object[] array1, Object[] array2) Returns true if the two given arrays are deeply equal to one another.
static boolean	Arrays.deepEquals(Object[] array1, Object[] array2) Returns true if the two given arrays are deeply equal to one another.
static boolean	Objects.deepEquals(Object a, Object b)
static int	Arrays.deepHashCode(Object[] array) Returns a hash code based on the "deep contents" of the given array.
static String	Arrays.deepToString(Object[] array) Creates a "deep" String representation of the Object[] passed, such that if the array contains other arrays, the String representation of those arrays is generated as well.
boolean	Vector.equals(Object object) Compares the specified object to this vector and returns if they are equal.
boolean	Set.equals(Object object) Compares the specified object to this set, and returns true if they represent the same object using a class specific comparison.
boolean	Map.equals(Object object) Compares the argument to the receiver, and returns true if the specified object is a Map and both Maps contain the same mappings.
boolean	Map.Entry.equals(Object object) Compares the specified object to this Map.Entry and returns if they are equal.
boolean	List.equals(Object object) Compares the given object with the List, and returns true if they represent the same object using a class specific comparison.
boolean	IdentityHashMap.equals(Object object) Compares this map with other objects.
boolean	Hashtable.equals(Object object) Compares this Hashtable with the specified object and indicates if they are equal.
boolean	Date.equals(Object obj) Compares two dates for equality.
boolean	Comparator.equals(Object object) Compares this Comparator with the specified Object and indicates whether they are equal.
boolean	Collection.equals(Object object) Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison.
boolean	Calendar.equals(Object obj) Compares this calendar to the specified object.
boolean	BitSet.equals(Object obj) Compares the argument to this BitSet and returns whether they are equal.
boolean	AbstractSet.equals(Object object) Compares the specified object to this Set and returns true if they are equal.
boolean	AbstractMap.equals(Object object) Compares the specified object to this instance, and returns true if the specified object is a map and both maps contain the same mappings.
boolean	AbstractMap.SimpleImmutableEntry.equals(Object object) Answers whether the object is equal to this entry.
boolean	AbstractMap.SimpleEntry.equals(Object object) Answers whether the object is equal to this entry.
boolean	AbstractList.equals(Object object) Compares the specified object to this list and return true if they are equal.
static boolean	Arrays.equals(Object[] array1, Object[] array2) Compares the two arrays.
static boolean	Arrays.equals(Object[] array1, Object[] array2) Compares the two arrays.
static boolean	Objects.equals(Object a, Object b) Returns true if the arguments are equal to each other and false otherwise.
static void	Arrays.fill(Object[] array, int start, int end, Object value) Fills the specified range in the array with the specified element.
static void	Arrays.fill(Object[] array, int start, int end, Object value) Fills the specified range in the array with the specified element.
static void	Arrays.fill(Object[] array, Object value) Fills the specified array with the specified element.
static void	Arrays.fill(Object[] array, Object value) Fills the specified array with the specified element.
static int	Collections.frequency(Collection<?> c, Object o) Returns the number of elements in the Collection that match the Object passed.
V	TreeMap.get(Object key) Returns the value of the mapping with the specified key.
V	Map.get(Object key) Returns the value of the mapping with the specified key.
V	LinkedHashMap.get(Object key) Returns the value of the mapping with the specified key.
V	IdentityHashMap.get(Object key) Returns the value of the mapping with the specified key.
V	Hashtable.get(Object key) Returns the value associated with the specified key in this Hashtable.
V	HashMap.get(Object key) Returns the value of the mapping with the specified key.
abstract V	Dictionary.get(Object key) Returns the value which is associated with key.
V	AbstractMap.get(Object key) Returns the value of the mapping with the specified key.
static int	Objects.hash(Object... values)
static int	Objects.hashCode(Object o) Returns the hash code of a non-null argument and 0 for a null argument.
static int	Arrays.hashCode(Object[] array) Returns a hash code based on the contents of the given array.
int	Vector.indexOf(Object object) Searches in this vector for the index of the specified object.
int	List.indexOf(Object object) Searches this List for the specified object and returns the index of the first occurrence.
int	LinkedList.indexOf(Object object)
int	ArrayList.indexOf(Object object)
int	AbstractList.indexOf(Object object) Searches this list for the specified object and returns the index of the first occurrence.
int	Vector.indexOf(Object object, int location) Searches in this vector for the index of the specified object.
int	Vector.lastIndexOf(Object object) Searches in this vector for the index of the specified object.
int	List.lastIndexOf(Object object) Searches this List for the specified object and returns the index of the last occurrence.
int	LinkedList.lastIndexOf(Object object) Searches this LinkedList for the specified object and returns the index of the last occurrence.
int	ArrayList.lastIndexOf(Object object)
int	AbstractList.lastIndexOf(Object object) Searches this list for the specified object and returns the index of the last occurrence.
int	Vector.lastIndexOf(Object object, int location) Searches in this vector for the index of the specified object.
static boolean	Objects.nonNull(Object obj)
void	Observable.notifyObservers(Object data) If hasChanged() returns true, calls the update() method for every Observer in the list of observers using the specified argument.
boolean	Vector.remove(Object object) Removes the first occurrence, starting at the beginning and moving towards the end, of the specified object from this vector.
boolean	TreeSet.remove(Object object) Removes an occurrence of the specified object from this TreeSet.
V	TreeMap.remove(Object key) Removes the mapping with the specified key from this map.
boolean	Set.remove(Object object) Removes the specified object from this set.
boolean	PriorityQueue.remove(Object o) Removes the specified object from the priority queue.
V	Map.remove(Object key) Removes a mapping with the specified key from this Map.
boolean	List.remove(Object object) Removes the first occurrence of the specified object from this List.
boolean	LinkedList.remove(Object object)
V	LinkedHashMap.remove(Object key) Removes the mapping with the specified key from this map.
V	IdentityHashMap.remove(Object key) Removes the mapping with the specified key from this map.
V	Hashtable.remove(Object key) Removes the key/value pair with the specified key from this Hashtable.
boolean	HashSet.remove(Object object) Removes the specified object from this HashSet.
V	HashMap.remove(Object key) Removes the mapping with the specified key from this map.
abstract V	Dictionary.remove(Object key) Removes the key/value pair with the specified key from this dictionary.
boolean	Collection.remove(Object object) Removes one instance of the specified object from this Collection if one is contained (optional).
boolean	ArrayList.remove(Object object)
boolean	ArrayDeque.remove(Object obj) Removes the first equivalent element of the specified object.
V	AbstractMap.remove(Object key) Removes a mapping with the specified key from this Map.
boolean	AbstractCollection.remove(Object object) Removes one instance of the specified object from this Collection if one is contained (optional).
boolean	Vector.removeElement(Object object) Removes the first occurrence, starting at the beginning and moving towards the end, of the specified object from this vector.
boolean	LinkedList.removeFirstOccurrence(Object o) Removes the first equivalent element of the specified object.
boolean	Deque.removeFirstOccurrence(Object o) Removes the first equivalent element of the specified object.
boolean	ArrayDeque.removeFirstOccurrence(Object obj) Removes the first equivalent element of the specified object.
boolean	LinkedList.removeLastOccurrence(Object o) Removes the last equivalent element of the specified object.
boolean	Deque.removeLastOccurrence(Object o) Removes the last equivalent element of the specified object.
boolean	ArrayDeque.removeLastOccurrence(Object obj) Removes the last equivalent element of the specified object.
int	Stack.search(Object o) Returns the index of the first occurrence of the object, starting from the top of the stack.
static void	Arrays.sort(Object[] array) Sorts the specified array in ascending natural order.
static void	Arrays.sort(Object[] array, int start, int end) Sorts the specified range in the array in ascending natural order.
static <T> void	Arrays.sort(T[] array, Comparator<? super T> comparator) Sorts the specified array using the specified Comparator.
static <T> void	Arrays.sort(T[] array, int start, int end, Comparator<? super T> comparator) Sorts the specified range in the array using the specified Comparator.
<T> T[]	Vector.toArray(T[] contents) Returns an array containing all elements contained in this vector.
<T> T[]	Set.toArray(T[] array) Returns an array containing all elements contained in this set.
<T> T[]	PriorityQueue.toArray(T[] array) Returns all the elements in an array, and the type of the result array is the type of the argument array.
<T> T[]	List.toArray(T[] array) Returns an array containing all elements contained in this List.
<T> T[]	LinkedList.toArray(T[] contents) Returns an array containing all elements contained in this LinkedList.
<T> T[]	Collection.toArray(T[] array) Returns an array containing all elements contained in this Collection.
<T> T[]	ArrayList.toArray(T[] contents) Returns an array containing all elements contained in this ArrayList.
<T> T[]	AbstractList.toArray(T[] contents) Returns an array containing all elements contained in this ArrayList.
<T> T[]	AbstractCollection.toArray(T[] contents) Returns an array containing all elements contained in this ArrayList.
static String	Objects.toString(Object o)
static String	Arrays.toString(Object[] array) Creates a String representation of the Object[] passed.
static String	Objects.toString(Object o, String nullDefault)
void	Observer.update(Observable observable, Object data) This method is called if the specified Observable object's notifyObservers method is called (because the Observable object has been updated.

Uses of Object in java.util.concurrent

Subclasses of Object in java.util.concurrent

Modifier and Type	Class and Description
class	ThreadLocalRandom