java.lang.object|object class api|methods of|in java

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Object Class (or) Super class for all classes in java (or) java.Lang.Object:

       Java.Lang.Object is the super class of all classes in java. Why it is super class for all classes in java, because it contains some methods such as Finalize(), toString() etc….. , these methods providing common functionality for all classes. For that Java.Lang.Object was designed as super class for  all classes in java.

The Following are the methods in Java.Lang.Object Class:

1)      private static native void registerNatives():

Returns the runtime class of this Object. The returned object is the object that is locked by  static synchronized methods of the represented class.

2)      public final native Class<?> getClass():

3)      public native int hashCode():                                                                                                                                       Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by  java.util.HashMap.

4)      public boolean equals(Object obj) //Contains Definition:                                                                                                                                                       Indicates whether some other object is "equal to" this one.

5)      protected native Object clone() throws CloneNotSupportedException:

6)      public String toString(): 

              Returns a string representation of the object. In general, the method returns a string that "textually represents" this object.

7)      public final native void notify():

8)      public final native void notifyAll():

9)      public final void wait(long timeout, int nanos) throws InterruptedException //contains  Definition:

            The above 7,8,9 would briefly in multi threading.

10)   protected void finalize() throws Throwable //contains Definition:

          This is most useful method in Java.lang.Object Class because it used to un reference the referenced variables and datamembers in class. it acts like a garbage collector.

    Inner code Of Java.Lang.Object Class Api or Object Class Api :

      package java.lang; // this is hierarchy of Object Class.

   public class Object {

     private static native void registerNatives(); // Returns the runtime class of this {@code Object}. The     

         //returned  object is the object that is locked by  static synchronized methods of the represented class.

      static {

                 registerNatives();

                }

     public final native Class<?> getClass();

     public native int hashCode(); 

     public boolean equals(Object obj) {

                    return (this == obj);

                }

    protected native Object clone() throws CloneNotSupportedException;

    public String toString() {

                       return getClass().getName() + "@" + Integer.toHexString(hashCode());

                 }

   public final native void notify();

   public final native void notifyAll();           

   public final native void wait(long timeout) throws InterruptedException;

   public final void wait(long timeout, int nanos) throws InterruptedException {

        if (timeout < 0) {

                  throw new IllegalArgumentException("timeout value is negative");

              }

        if (nanos < 0 || nanos > 999999) {

            throw new IllegalArgumentException(

                                "nanosecond timeout value out of range");

                        }

        if (nanos >= 500000 || (nanos != 0 && timeout == 0)) {

                       timeout++;

                 }

       }