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Sunday, 13 January 2013

static|method overriding|overidden in|of java with example|rules

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Definition Of Method Overriding :
         Method overriding is equal to method heading is same but its signature is different.
       The process of redefining the original method in various ways for performing several operations is known as Method Overriding.

The Following Rules must consider while doing with Method overriding or Overridden    method:

1)      If we want to apply overriding we need  to make use of inheritance concept.
2)      While we are overriding the methods, original methods are always resides in
        base class and overridden methods / redefined methods always present in 
        derived class.
3)     Arguments of overridden methods Must not change
4)     Return type of overridden method  Can't change except for covariant (subtype) returns
5)      Exceptions can reduce/eliminate. Must not throw new/broader checked exceptions
6)     Access must not be more restrictive. Can be less restrictive.
7)      Invocation Which method to call is based on object type, at runtime time

The Following Program illustrate the concept of Method overriding
        Class Basedemo
           void fun1(int x,int y)
          System.out.println(“this is Base Demo”);
          int z=x+y;
          System.out.println(“sum in Base Demo is”+z);
     Class InterBasedemo extends Basedemo
       void fun1(int x,int y)
      System.out.println(“this is Inter  Base Demo”);
      int z=x*y;
      System.out.println(“multiple in Inter  Base Demo is”+z);
     Class Deriveddemo extends InterBasedemo
        void fun1(int x,int y)
        System.out.println(“this is Derived Demo”);
        int z=x/y;
        System.out.println(“division in Derived Demo is”+z);
     Class Demo
        public static void main(String args[])
         int  x=Integer.ParseInt(args[0]);
         int  y=Integer.ParseInt(args[1]);
         Demo do=new Demo();

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