Java回调机制

一、回调接口
public interface ICallback {
 void execute();
}

 

二、回调实现

public class MyCallback implements ICallback {

 public void execute() {
  System.out.println("callback message");
 }

}

 

 

 

三、需要回调的类

public class NeedCallback {

 private ICallback callback;

 public void setCallback(ICallback callback) {
  this.callback = callback;
 }
 
 public void doSomeThing() {
  callback.execute();
 }

}

四、使用

public class MainTest {

 public static void main(String[] args) {
  NeedCallback need = new NeedCallback();
  need.setCallback(new MyCallback());
  System.out.println("do something first");
  need.doSomeThing();
 }
}