Relation between toString() and hashCode() methods...

If you are a java programmer you need to have the clear picture of the java.lang.Object class, this Object class has the most important methods like toString() and hashCode() method. now you will be scratching your head what is the relation between toString() and hashCode() methods.
the Answer is as follows.

• The Signature of the hashCode method is as follows.

                public native int hashCode();

 the hashCode method is a native method  which returns the integer value.

• The Signature of the toString() method is as follows.

     public String toString() 
      { 
return getClass().getName() + "@" +Integer.toHexString(hashCode());
       }


 so the toString() methods internally uses hashCode() Method.

Actually
                                 System.out.println(reference);

                                            is equivalent to

                                 System.out.println(reference.toString());

the example for the above concepts is as follows..

Example-1

//MyDemo.java

public class MyDemo
{
public String toString()
{
return "secret";
}
public static void main(String ar[])
{
MyDemo m=new MyDemo();
System.out.println(m);
System.out.println(m.toString());
}
}

Output is...

secret

secret

***************************************************************

Example-2

//MyDemo.java

public class MyDemo
{
public int hashCode()
{
return 1;
}

public String toString()
{
return "secret";
}
public static void main(String ar[])
{
MyDemo m=new MyDemo();
System.out.println(m);

}

}

Output is..

secret

because the toString() method internally uses hashCode() method only in Object class.

right now we are not calling the hashCode() function.

that is why we will get only secret as a output