covariant return types

[coder]

hi,I am new to java...
I couldn't learn about covariant return types in java..
who can explain me...
my other question is

class A{
public A go(){
return new A();
}
public static void main(String args[]){
A n=new A();
n.go();//what will occur,I dont know how metod works with class
//name,plz help

}
}

[gcalvin]

Please use CODE tags when posting code.

I couldn't learn about covariant return types in java..
who can explain me...

This article (first Google hit for "Java covariant return types") explains it pretty well. Tell us what you don't understand about it.

Java Tips - Covariant return types

my other question is

class A{

        public A go(){
                return new A();
        }

        public static void main(String args[]) {
                A n =new A();
                n.go(); //what will occur,I dont know how metod works with class 
                          //name,plz help
        }
}

Essentially nothing will happen. You are creating one new object of type A, then calling its go() method, which creates another new object of type A. But you are not doing anything with the second one, and not even assigning it to a variable. Objects of type A have no local storage, or any other significant side effects, so basically nothing happens.

-Gary-