how to call method of Owner?

Question

Hello. I have Class1, which has methods:

1. setSomething()
2. createObjectOfClass2()

Now, when I create object of Class2, is it possible to call setSomething method from it?

Answer 1

If Class2 doesn't extends Class1, then you can call setSomething() on any instance of Class1 if it's not a static method:

Class1 c = new Class1();
c.setSomething();

Answer 2

If you like, but you're introducing coupling, which will make separating functionality quite difficult later. Just make setSomething public and pass a reference to the first object to the second's constructor.

public class Class1 {
    Class2 object2 = null;

    public void setSomething(Object something) { ... }

    public void createObjectOfClass2() {
        object2 = new Class2(this);
    }
}

public class Class2 {
    public Class2(Class1 parent) {
        parent.setSomething(new Foo());
    }
}

Answer 3

Call Parent.this.method()

e.g.:

public class K1
{
public class K2
    {
    public void hello()
        {
        K1.this.setSomething();
        }

    } 

public void setSomething()
   {
   System.out.println("Set Something");
   }

public K2 createObjectOfClass2()
   {
   return new K2();
   }

public static void main(String args[])
   {
   new K1().createObjectOfClass2().hello();
   }


}