Java 實現回調

package callbackexample; 

public interface ICallBack { 

    //需要回調的方法 public void postExec(); 

}

package callbackexample; 

public class FooBar { //組合彙總原則 

private ICallBack callBack; 

public void setCallBack(ICallBack callBack) { 

this.callBack = callBack; 

doSth(); 

} 

public void doSth() { 

callBack.postExec(); 

} 

}

package callbackexample; 

public class Test { 

public static void main(String[] args) { 

FooBar foo = new FooBar(); 

foo.setCallBack(new ICallBack() { 

public void postExec() { 

System.out.println("在Test類中實現但不能被Test的對象引用,而由FooBar對象調用"); 

} 

}); 

} 

}