20.1

java.lang.Object

THE PACKAGE JAVA.LANG

20.1 The Class

java.lang.Object

The class

Object

 is the single root of the class hierarchy. All objects, including

arrays, implement the methods of this class.

public class Object {

public final Class getClass();

public String toString();

public boolean equals(Object obj);

public int hashCode();

protected Object clone()

throws CloneNotSupportedException;

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;

}

20.1.1

public final Class getClass()

This method returns a reference to the unique object of type

Class

 ( 20.3) that

represents the class of this object. That

Class

 object is the object that is locked by

static synchronized

methods of the represented class.

20.1.2

public String toString()

The general contract of

toString

 is that it returns a string that  textually repre 

sents  this object. The idea is to provide a concise but informative representation

that will be useful to a person reading it.

The

toString

 method defined by class

Object

 returns a string consisting of

the name of the class of which the object is an instance, a commercial at character

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