Thinking in Java(9)-closures and callbacks

package interfaces.classprocessor;

interface Incrementable{
void increment();
}

class Callee1 implements Incrementable {
private int i = 0;
public void increment()
{
i++;
System.out.println(i);
}
}

class MyIncrement {
public  void increment()
{
System.out.println("Other operation");
}
static void f(MyIncrement mi){
mi.increment();
}
}

class Callee2 extends MyIncrement {
private int i = 0;
public void increment() {
super.increment();
i++;
System.out.println(i);
}
private class Closure implements Incrementable {
public void increment()
{
Callee2.this.increment();
}
}
Incrementable getCallbackReference() {
return new Closure();
}
}

class Caller {
private Incrementable callbackReference;
Caller(Incrementable cbh) {
callbackReference = cbh;
}
void go() {
callbackReference.increment();
}
}

public class Callbacks {

public static void main(String[] args) {
// TODO Auto-generated method stub
Callee1 c1 = new Callee1();
Callee2 c2 = new Callee2();
MyIncrement.f(c2);
Caller caller1 = new Caller(c1);
Caller caller2 = new Caller(c2.getCallbackReference());
caller1.go();
caller1.go();
caller2.go();
caller2.go();

}

}

Other operation
1
1
2
Other operation
2
Other operation
3