JAVA重写不需要@override

Posted 2020-11-23 叶丶梓轩

一，如下代码，

package com.boot.enable.bootenable;

import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

import java.util.concurrent.TimeUnit;

@Component("RunnableDemo")
public class RunnableDemo implements Runnable {
    @Override
    @Async // 异步方式执行方法
    public void run() {
        for(int i=0;i<5;i++)
        {
            System.out.println(i);
            try {
                TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

 

package com.boot.enable.bootenable;

import org.springframework.stereotype.Component;

@Component("RunnableDemo2")
public class RunnableDemo2 implements Runnable {
    public void run() {
        for (int i=6;i<10;i++)
        {
            System.out.println(i);
        }
    }
}

 

package com.boot.enable.bootenable;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;

@SpringBootApplication
public class BootEnableApplication {
    public static void main(String[] arg) {
        ConfigurableApplicationContext context = SpringApplication.run(BootEnableApplication.class);
        Runnable bean = context.getBean("RunnableDemo", Runnable.class);
        System.out.println("start");
        bean.run();
        System.out.println("end");
    }
}

二，可以运行，不写JAVA重写不需要@override，编译也是通过的，那个是注解，是给编译器看的，告诉编译器我下面写的代码是重写方法，让编译器检查，执行的时候不会执行注解代码