new method

[Yuan Ye]

Look at the following program,
class test
{ public void doo() {System.out.print("doo");}
public static void main(String [] args)
{test n = new test() {}; //why correct?
n.doo();}
}
Could anyone please tell me why "new test() {}" is a correct format for the method new; does it have any difference with "new test()"?
Thanks in advance

[Rory French]

Hi Yaun.

class test {

public void doo() {
System.out.print("doo");
}
public static void main(String [] args) {
test n = new test() {}; //why correct?
n.doo();}
}
}

The syntax .new test() {}; creates a very simple anonymous inner class. Technically, it creats a subclass instance of test, albeit one that does not override any of the methods of the test class.
So this syntax is effectively redundant when used in this way. To Make it more meaningful you could override the doo() method when you instantiate. Example :

test n = new test() {
  public void doo() {
    System.out.print("daa");
  }
};

And given the above change, n.doo() will now print "daa" instead of "doo".
Hope this helps