Android
java.lang
public class

java.lang.Object

java.lang.Object

This class must be implemented by the vm vendor. Object is the root of the java class hierarchy. All non-base types respond to the messages defined in this class.

Known Direct Subclasses
Known Indirect Subclasses

Summary

Public Constructors

            Object()
Constructs a new instance of this class.

Public Methods

          boolean  equals(Object o)
Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison.
    final      Class<? extends Object getClass()
Returns the unique instance of java.lang.Class which represents the class of the receiver.
          int  hashCode()
Returns an integer hash code for the receiver.
    final      void  notify()
Causes one thread which is wait ing on the receiver to be made ready to run.
    final      void  notifyAll()
Causes all threads which are wait ing on the receiver to be made ready to run.
          String  toString()
Returns a string containing a concise, human-readable description of the receiver.
    final      void  wait(long time, int frac)
Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
    final      void  wait(long time)
Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
    final      void  wait()
Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).

Protected Methods

          Object  clone()
Returns a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
          void  finalize()
Called by the virtual machine when there are no longer any (non-weak) references to the receiver.

Details

Public Constructors

public Object()

Constructs a new instance of this class.

Public Methods

public boolean equals(Object o)

Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison. The implementation in Object returns true only if the argument is the exact same object as the receiver (==).

Parameters

o Object the object to compare with this object.

Returns

  • boolean true if the object is the same as this object false if it is different from this object.

See Also

public final Class<? extends Object> getClass()

Returns the unique instance of java.lang.Class which represents the class of the receiver.

Returns

  • Class the receiver's Class

public int hashCode()

Returns an integer hash code for the receiver. Any two objects which answer true when passed to .equals must answer the same value for this method.

Returns

  • int the receiver's hash.

See Also

public final void notify()

Causes one thread which is wait ing on the receiver to be made ready to run. This does not guarantee that the thread will immediately run. The method can only be invoked by a thread which owns the receiver's monitor.

public final void notifyAll()

Causes all threads which are wait ing on the receiver to be made ready to run. The threads are scheduled according to their priorities as specified in class Thread. Between any two threads of the same priority the one which waited first will be the first thread that runs after being notified. The method can only be invoked by a thread which owns the receiver's monitor.

public String toString()

Returns a string containing a concise, human-readable description of the receiver.

Returns

  • String a printable representation for the receiver.

public final void wait(long time, int frac)

Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout. The method can only be invoked by a thread which owns the receiver's monitor. A waiting thread can be sent interrupt() to cause it to prematurely stop waiting, so senders of wait should check that the condition they were waiting for has been met.

When the thread waits, it gives up ownership of the receiver's monitor. When it is notified (or interrupted) it re-acquires the monitor before it starts running.

Parameters

time long The maximum time to wait in milliseconds.
frac int The fraction of a mSec to wait, specified in nanoseconds.

Throws

InterruptedException to interrupt the wait.

public final void wait(long time)

Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout. The method can only be invoked by a thread which owns the receiver's monitor. A waiting thread can be sent interrupt() to cause it to prematurely stop waiting, so senders of wait should check that the condition they were waiting for has been met.

When the thread waits, it gives up ownership of the receiver's monitor. When it is notified (or interrupted) it re-acquires the monitor before it starts running.

Parameters

time long The maximum time to wait in milliseconds.

Throws

InterruptedException to interrupt the wait.

public final void wait()

Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll). The method can only be invoked by a thread which owns the receiver's monitor. A waiting thread can be sent interrupt() to cause it to prematurely stop waiting, so senders of wait should check that the condition they were waiting for has been met.

When the thread waits, it gives up ownership of the receiver's monitor. When it is notified (or interrupted) it re-acquires the monitor before it starts running.

Throws

InterruptedException to interrupt the wait.

Protected Methods

protected Object clone()

Returns a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.

Classes which wish to support cloning must specify that they implement the Cloneable interface, since the implementation checks for this.

Returns

  • Object a shallow copy of this object.

Throws

CloneNotSupportedException if the receiver's class does not implement the interface Cloneable.

protected void finalize()

Called by the virtual machine when there are no longer any (non-weak) references to the receiver. Subclasses can use this facility to guarantee that any associated resources are cleaned up before the receiver is garbage collected. Uncaught exceptions which are thrown during the running of the method cause it to terminate immediately, but are otherwise ignored.

Note: The virtual machine assumes that the implementation in class Object is empty.

Throws

Throwable The virtual machine ignores any exceptions which are thrown during finalization.
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