本帖最后由 long 于 2013-5-13 13:12 编辑
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) {
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();
}
}
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