Uses of Class
java.lang.Object

Packages that use Object

Package	Description
java.io	Contains Input/Output streams communication classes.
java.lang	Contains core language classes.
java.lang.annotation	Contains core language classes related to compile-time annotations.
java.lang.ref	Contains core language classes related to object references & garbage collection.
java.security	Contains core language classes related to permission management.
java.util	Contains utility classes including the collections framework and date manipulation.

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	FilterInputStream A FilterInputStream contains some other input stream, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
class	FilterOutputStream This class is the superclass of all classes that filter output streams.
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 decodes them into characters using a specified charset.
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 encoded into bytes using a specified charset.
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	UnsupportedEncodingException The Character Encoding is not supported.
class	UTFDataFormatException Signals that a malformed string in modified UTF-8 format 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	Reader.lock The object used to synchronize operations on this stream.
protected Object	Writer.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) Prints an object.
void	PrintStream.println(Object x) Prints an Object and then terminate the line.

Constructors in java.io with parameters of type Object

Constructor and Description
Reader(Object lock) Creates a new character-stream reader whose critical sections will synchronize on the given object.
Writer(Object lock) Creates 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 Thrown when an application tries 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 Thrown to indicate that an assertion has failed.
class	Boolean The Boolean class wraps a value of the primitive type boolean in an object.
class	Byte The Byte class wraps a value of primitive type byte in an object.
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	ClassCircularityError Thrown when the Java Virtual Machine detects a circularity in the superclass hierarchy of a class being loaded.
class	ClassFormatError Thrown when the Java Virtual Machine attempts to read a class file and determines that the file is malformed or otherwise cannot be interpreted as a class file.
class	ClassNotFoundException Thrown when an application tries to load in a class through its string name using: The forName method in class Class.
class	CloneNotSupportedException Thrown to indicate that the clone method in class Object has been called to clone an object, but that the object's class does not implement 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>> This is the common base class of all Java language enumeration types.
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	ExceptionInInitializerError Signals that an unexpected exception has occurred in a static initializer.
class	Float The Float class wraps a value of primitive type float in an object.
class	IllegalAccessError Thrown if an application attempts to access or modify a field, or to call a method that it does not have access to.
class	IllegalAccessException An IllegalAccessException is thrown when an application tries to reflectively create an instance (other than an array), set or get a field, or invoke a method, but the currently executing method does not have access to the definition of the specified class, field, method or constructor.
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 Signals that a method has been invoked at an illegal or inappropriate time.
class	IllegalThreadStateException Thrown to indicate that a thread is not in an appropriate state for the requested operation.
class	IncompatibleClassChangeError Thrown when an incompatible class change has occurred to some class definition.
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	InstantiationError Thrown when an application tries to use the Java new construct to instantiate an abstract class or an interface.
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.
class	Integer The Integer class wraps a value of the primitive type int in an object.
class	InternalError Thrown to indicate some unexpected internal error has occurred in the Java Virtual Machine.
class	InterruptedException Thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted, either before or during the activity.
class	LinkageError Subclasses of LinkageError indicate that a class has some dependency on another class; however, the latter class has incompatibly changed after the compilation of the former class.
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 such as the elementary exponential, logarithm, square root, and trigonometric functions.
class	NegativeArraySizeException Thrown if an application tries to create an array with negative size.
class	NoClassDefFoundError Thrown if the Java Virtual Machine or a ClassLoader instance 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 if an application tries to access or modify a specified field of an object, and that object no longer has that field.
class	NoSuchFieldException Signals that the class doesn't have a field of a specified name.
class	NoSuchMethodError Thrown if an application tries to call a specified method of a class (either static or instance), and that class no longer has a definition of that method.
class	NoSuchMethodException Thrown when a particular method cannot be found.
class	NullPointerException Thrown when an application attempts to use null in a case where an object is required.
class	Number The abstract class Number is the superclass of classes BigDecimal, BigInteger, Byte, Double, Float, Integer, Long, and Short.
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	Package Package represent a Java package.
class	ReflectiveOperationException Common superclass of exceptions thrown by reflective operations in core reflection.
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	RuntimePermission This class is for runtime permissions.
class	SecurityException Thrown by the security manager to indicate a security violation.
class	SecurityManager The security manager is a class that allows applications to implement a security policy.
class	Short The Short class wraps a value of primitive type short in an object.
class	StackOverflowError Thrown when a stack overflow occurs because an application recurses too deeply.
class	StackTraceElement An element in a stack trace.
class	String The String class represents character strings.
class	StringBuffer A thread-safe, mutable sequence of characters.
class	StringBuilder A mutable sequence of characters.
class	StringIndexOutOfBoundsException Thrown by String methods to indicate that an index is either negative or greater than 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	Throwable The Throwable class is the superclass of all errors and exceptions in the Java language.
class	UnknownError Thrown when an unknown but serious exception has occurred in the Java Virtual Machine.
class	UnsatisfiedLinkError Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a method declared native.
class	UnsupportedClassVersionError Thrown when the Java Virtual Machine attempts to read a class file and determines that the major and minor version numbers in the file are not supported.
class	UnsupportedOperationException Thrown to indicate that the requested operation is not supported.
class	VerifyError Thrown when the "verifier" detects that a class file, though well formed, contains some sort of internal inconsistency or security problem.
class	VirtualMachineError Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.

Methods in java.lang that return Object

Modifier and Type	Method and Description
protected Object	Object.clone() Creates and returns a copy of this object.

Methods in java.lang with parameters of type Object

Modifier and Type	Method and Description
StringBuffer	StringBuffer.append(Object obj) Appends the string representation of the Object argument.
StringBuilder	StringBuilder.append(Object obj) Appends the string representation of the Object argument.
static void	System.arraycopy(Object src, int srcPos, Object dest, int destPos, int length) Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.
T	Class.cast(Object obj) Casts an object to the class or interface represented by this Class object.
boolean	Float.equals(Object obj) Compares this object against 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.
boolean	Long.equals(Object obj) Compares this object to the specified object.
boolean	Double.equals(Object obj) Compares this object against the specified object.
boolean	Short.equals(Object obj) Compares this object to the specified object.
boolean	Enum.equals(Object other) Returns true if the specified object is equal to this enum constant.
boolean	String.equals(Object anObject) Compares this string to the specified object.
boolean	Byte.equals(Object obj) Compares this object to the specified object.
boolean	Integer.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	StackTraceElement.equals(Object obj) Returns true if the specified object is another StackTraceElement instance representing the same execution point as this instance.
boolean	Character.equals(Object obj) Compares this object against the specified object.
static boolean	Thread.holdsLock(Object obj) Returns true if and only if the current thread holds the monitor lock on the specified object.
static int	System.identityHashCode(Object x) Returns the same hash code for the given object as would be returned by the default method hashCode(), whether or not the given object's class overrides hashCode().
StringBuffer	StringBuffer.insert(int offset, Object obj) Inserts the string representation of the Object argument into this character sequence.
StringBuilder	StringBuilder.insert(int offset, Object obj) Inserts the string representation of the Object argument into this character sequence.
boolean	Class.isInstance(Object obj) Determines if the specified Object is assignment-compatible with the object represented by this Class.
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) Constructs an AssertionError with its detail message derived from the specified object, which is converted to a string as defined in section 15.18.1.1 of The Java™ Language Specification.

Uses of Object in java.lang.annotation

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.ref

Subclasses of Object in java.lang.ref

Modifier and Type	Class and Description
class	Reference<T> Abstract base class for reference objects.
class	ReferenceQueue<T> Reference queues, to which registered reference objects are appended by the garbage collector after the appropriate reachability changes are detected.
class	WeakReference<T> Weak reference objects, which do not prevent their referents from being made finalizable, finalized, and then reclaimed.

Uses of Object in java.security

Subclasses of Object in java.security

Modifier and Type	Class and Description
class	BasicPermission The BasicPermission class extends the Permission class, and can be used as the base class for permissions that want to follow the same naming convention as BasicPermission.
class	Permission Abstract class for representing access to a system resource.

Methods in java.security with parameters of type Object

Modifier and Type	Method and Description
boolean	BasicPermission.equals(Object obj) Checks two BasicPermission objects for equality.
abstract boolean	Permission.equals(Object obj) Checks two Permission objects for equality.

Uses of Object in java.util

Subclasses of Object in java.util

Modifier and Type	Class and Description
class	AbstractCollection<E> This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.
class	AbstractList<E> This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a "random access" data store (such as an array).
class	AbstractMap<K,V> This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface.
static class	AbstractMap.SimpleEntry<K,V> An Entry maintaining a key and a value.
static class	AbstractMap.SimpleImmutableEntry<K,V> An Entry maintaining an immutable key and value.
class	AbstractSet<E> This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.
class	ArrayList<E> Resizable-array implementation of the List interface.
class	Calendar The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR , MONTH , DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
class	ConcurrentModificationException This exception may be thrown by methods that have detected concurrent modification of an object when such modification is not permissible.
class	Date The class Date represents a specific instant in time, with millisecond precision.
class	Dictionary<K,V> The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.
class	EmptyStackException Thrown by methods in the Stack class to indicate that the stack is empty.
class	EventObject The root class from which all event state objects shall be derived.
class	HashMap<K,V> Hash table based implementation of the Map interface.
class	Hashtable<K,V> This class implements a hash table, which maps keys to values.
class	NoSuchElementException Thrown by the nextElement method of an Enumeration to indicate that there are no more elements in the enumeration.
class	Observable This class represents an observable object, or "data" in the model-view paradigm.
class	PropertyPermission This class is for property permissions.
class	Random An instance of this class is used to generate a stream of pseudorandom numbers.
class	Stack<E> The Stack class represents a last-in-first-out (LIFO) stack of objects.
class	Timer Deprecated. Please consider ej.bon.Timer from BON specification instead.
class	TimerTask Deprecated. Please consider ej.bon.TimerTask from BON specification instead.
class	TimeZone TimeZone represents a time zone offset, and also figures out daylight savings.
class	Vector<E> The Vector class implements a growable array of objects.
class	WeakHashMap<K,V> Hash table based implementation of the Map interface, with weak keys.

Fields in java.util declared as Object

Modifier and Type	Field and Description
protected Object[]	Vector.elementData The array buffer into which the components of the vector are stored.
protected Object	EventObject.source The object on which the Event initially occurred.

Methods in java.util that return Object

Modifier and Type	Method and Description
Object	TimeZone.clone() Creates a copy of this TimeZone.
Object	Calendar.clone() Creates and returns a copy of this object.
Object	Vector.clone() Returns a clone of this vector.
Object	HashMap.clone() Returns a shallow copy of this HashMap instance: the keys and values themselves are not cloned.
Object	Hashtable.clone() Creates a shallow copy of this hashtable.
Object	ArrayList.clone() Returns a shallow copy of this ArrayList instance.
Object	Date.clone() Return a copy of this object.
protected Object	AbstractMap.clone() Returns a shallow copy of this AbstractMap instance: the keys and values themselves are not cloned.
Object	EventObject.getSource() The object on which the Event initially occurred.
Object[]	Vector.toArray() Returns an array containing all of the elements in this Vector in the correct order.
Object[]	List.toArray() Returns an array containing all of the elements in this list in proper sequence (from first to last element).
Object[]	Collection.toArray() Returns an array containing all of the elements in this collection.
Object[]	ArrayList.toArray() Returns an array containing all of the elements in this list in proper sequence (from first to last element).
Object[]	Set.toArray() Returns an array containing all of the elements in this set.
Object[]	AbstractCollection.toArray() Returns an array containing all of the elements in this collection.
<T> T[]	Vector.toArray(T[] a) Returns an array containing all of the elements in this Vector in the correct order; the runtime type of the returned array is that of the specified array.
<T> T[]	List.toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	Collection.toArray(T[] a) Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array.
<T> T[]	ArrayList.toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	Set.toArray(T[] a) Returns an array containing all of the elements in this set; the runtime type of the returned array is that of the specified array.
<T> T[]	AbstractCollection.toArray(T[] a) Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array.

Methods in java.util with parameters of type Object

Modifier and Type	Method and Description
boolean	Calendar.after(Object when) Returns whether this Calendar represents a time after the time represented by the specified Object.
boolean	Calendar.before(Object when) Returns whether this Calendar represents a time before the time represented by the specified Object.
boolean	Vector.contains(Object o) Returns true if this vector contains the specified element.
boolean	List.contains(Object o) Returns true if this list contains the specified element.
boolean	Collection.contains(Object o) Returns true if this collection contains the specified element.
boolean	Hashtable.contains(Object value) Tests if some key maps into the specified value in this hashtable.
boolean	ArrayList.contains(Object o) Returns true if this list contains the specified element.
boolean	Set.contains(Object o) Returns true if this set contains the specified element.
boolean	AbstractCollection.contains(Object o) Returns true if this collection contains the specified element.
boolean	Map.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	WeakHashMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	HashMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	Hashtable.containsKey(Object key) Tests if the specified object is a key in this hashtable.
boolean	AbstractMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	Map.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	WeakHashMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	HashMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	Hashtable.containsValue(Object value) Returns true if this hashtable maps one or more keys to this value.
boolean	AbstractMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
void	Vector.copyInto(Object[] anArray) Copies the components of this vector into the specified array.
boolean	PropertyPermission.equals(Object obj) Checks two PropertyPermission objects for equality.
boolean	Comparator.equals(Object obj) Indicates whether some other object is "equal to" this comparator.
boolean	Map.equals(Object o) Compares the specified object with this map for equality.
boolean	Map.Entry.equals(Object o) Compares the specified object with this entry for equality.
boolean	Calendar.equals(Object obj) Compares this Calendar to the specified Object.
boolean	Vector.equals(Object o) Compares the specified Object with this Vector for equality.
boolean	List.equals(Object o) Compares the specified object with this list for equality.
boolean	Collection.equals(Object o) Compares the specified object with this collection for equality.
boolean	Hashtable.equals(Object o) Compares the specified Object with this Map for equality, as per the definition in the Map interface.
boolean	AbstractList.equals(Object o) Compares the specified object with this list for equality.
boolean	AbstractSet.equals(Object o) Compares the specified object with this set for equality.
boolean	Set.equals(Object o) Compares the specified object with this set for equality.
boolean	Date.equals(Object obj) Compares two dates for equality.
boolean	AbstractMap.equals(Object o) Compares the specified object with this map for equality.
boolean	AbstractMap.SimpleEntry.equals(Object o) Compares the specified object with this entry for equality.
boolean	AbstractMap.SimpleImmutableEntry.equals(Object o) Compares the specified object with this entry for equality.
abstract V	Dictionary.get(Object key) Returns the value to which the key is mapped in this dictionary.
V	Map.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	WeakHashMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	HashMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	Hashtable.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	AbstractMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
int	Vector.indexOf(Object o) Returns the index of the first occurrence of the specified element in this vector, or -1 if this vector does not contain the element.
int	List.indexOf(Object o) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	AbstractList.indexOf(Object o) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	ArrayList.indexOf(Object o) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	Vector.indexOf(Object o, int index) Returns the index of the first occurrence of the specified element in this vector, searching forwards from index, or returns -1 if the element is not found.
int	Vector.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this vector, or -1 if this vector does not contain the element.
int	List.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	AbstractList.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	ArrayList.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	Vector.lastIndexOf(Object o, int index) Returns the index of the last occurrence of the specified element in this vector, searching backwards from index, or returns -1 if the element is not found.
void	Observable.notifyObservers(Object arg) If this object has changed, as indicated by the hasChanged method, then notify all of its observers and then call the clearChanged method to indicate that this object has no longer changed.
abstract V	Dictionary.remove(Object key) Removes the key (and its corresponding value) from this dictionary.
V	Map.remove(Object key) Removes the mapping for a key from this map if it is present (optional operation).
V	WeakHashMap.remove(Object key) Removes the mapping for a key from this weak hash map if it is present.
boolean	Vector.remove(Object o) Removes the first occurrence of the specified element in this Vector If the Vector does not contain the element, it is unchanged.
boolean	List.remove(Object o) Removes the first occurrence of the specified element from this list, if it is present (optional operation).
boolean	Collection.remove(Object o) Removes a single instance of the specified element from this collection, if it is present (optional operation).
V	HashMap.remove(Object key) Removes the mapping for the specified key from this map if present.
V	Hashtable.remove(Object key) Removes the key (and its corresponding value) from this hashtable.
boolean	ArrayList.remove(Object o) Removes the first occurrence of the specified element from this list, if it is present.
boolean	Set.remove(Object o) Removes the specified element from this set if it is present (optional operation).
V	AbstractMap.remove(Object key) Removes the mapping for a key from this map if it is present (optional operation).
boolean	AbstractCollection.remove(Object o) Removes a single instance of the specified element from this collection, if it is present (optional operation).
boolean	Vector.removeElement(Object obj) Removes the first (lowest-indexed) occurrence of the argument from this vector.
int	Stack.search(Object o) Returns the 1-based position where an object is on this stack.
<T> T[]	Vector.toArray(T[] a) Returns an array containing all of the elements in this Vector in the correct order; the runtime type of the returned array is that of the specified array.
<T> T[]	List.toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	Collection.toArray(T[] a) Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array.
<T> T[]	ArrayList.toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	Set.toArray(T[] a) Returns an array containing all of the elements in this set; the runtime type of the returned array is that of the specified array.
<T> T[]	AbstractCollection.toArray(T[] a) Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array.
void	Observer.update(Observable o, Object arg) This method is called whenever the observed object is changed.

Constructors in java.util with parameters of type Object

Constructor and Description
EventObject(Object source) Constructs a prototypical Event.