Java 之 回调函数实例说明

使用接口

也就是使用多态来实现回调函数

public interface ICallback {
public void   func();
}

public class ClassWithCallbackFunction implements ICallback{
public ClassWithCallbackFunction() {
}
public void func(){
System.out.println("cccccccccccccccccc");
}
}

public class Caller {
ICallback callback;
public void doCallback() {
callback.func();
}

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

}

public class MainClass {
public MainClass() {
}

public static void main(String[] args) {
Caller caller = new Caller();
caller.setCallback(new ClassWithCallbackFunction() {
public void func() {
System.out.println("aaaaaaaaaa");
}
});
caller.doCallback();
}
}
现实中是把doCallback()方法放在setCallback里调用,以上是为了说明回调原理
public class Caller {
ICallback callback;
public void doCallback() {
callback.func();
}

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

}