TYPES, VALUES, AND VARIABLES

The Class

String

4.3.3

public final void wait()

throws IllegalMonitorStateException,

InterruptedException {

. . .

 }

public final void wait(long millis)

throws IllegalMonitorStateException,

InterruptedException {

. . .

 }

public final void wait(long millis, int nanos) {

. . .

 }

throws IllegalMonitorStateException,

InterruptedException {

. . .

 }

public final void notify() {

. . .

 }

throws IllegalMonitorStateException

public final void notifyAll() {

. . .

 }

throws IllegalMonitorStateException

protected void finalize()

throws Throwable {

. . .

 }

}

The members of

Object

 are as follows:

The method

getClass

 returns the

Class

 ( 20.3) object that represents the

class of the object. A

Class

 object exists for each reference type. It can be

used, for example, to discover the fully qualified name of a class, its members,

its immediate superclass, and any interfaces that it implements. A class

method that is declared

synchronized

 ( 8.4.3.5) synchronizes on the lock

associated with the

Class

 object of the class.

The method

toString

 returns a

String

 representation of the object.

The methods

equals

 and

hashCode

 are declared for the benefit of hashtables

such as

java.util.Hashtable

 ( 21.7). The method

equals

 defines a notion

of object equality, which is based on value, not reference, comparison.

The method

clone

 is used to make a duplicate of an object.

The methods

wait

,

notify

, and

notifyAll

 are used in concurrent program 

ming using threads, as described in  17.

The method

finalize

 is run just before an object is destroyed and is

described in  12.6.

4.3.3   The Class

String

Instances of class

String

 ( 20.12) represent sequences of Unicode characters.

A

String

 object has a constant (unchanging) value. String literals ( 3.10.5) are

references to instances of class

String

.

The string concatenation operator

+

 ( 15.17.1) implicitly creates a new

String

 object.

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