Java回调

还是自己写的看的容易明白

import java.util.*;

public class Main {
    
	public static void main(String[] args) {
        Student st=new Student();
        st.doTask(new CallBack(){

                @Override
                public void taskResult(float percent) {
                    if(percent<1f){
                        System.out.println("未完成任务");
                    }
                    else{
                        System.out.println("完成任务");
                    }
                }
            });
    }

}
class Student{
    
    private float percent;
    
    public Student(){
        
    }
    
    public void doTask(final CallBack callBack){
        new Thread(new Runnable(){

                @Override
                public void run() {
                    for(int i=1;i<=10;i++){
                        try {
                            Thread.sleep(100);
                            percent=(float)i/10;
                            System.out.println("完成率:"+percent);
                        } catch (InterruptedException e) {}
                    }
                    callBack.taskResult(percent);
                }
            }).start();
    }
}

interface CallBack{
    void taskResult(float percent);
}