java匿名线程Thread的三种方式：lambda，run重写，Runable接口和run重写

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本文介绍了Java中创建线程的三种常见方法：使用Lambda表达式、重写Thread类的run方法及实现Runnable接口，并展示了如何利用这些方法以特定格式输出当前系统时间。


/*
* 匿名Thread几种方法：
* 1） 重写run方法：通过new Thread(){}.start() 直接new一个实例后实现并start， 实现里面重写run方法
* 2） 调用runable接口：new Thread( new Runable(){} ).start()
* 3） 通过lambda传参给Thread： new Thread( () -> {}).start()
*
* Task:
* “yyyy-MM-dd HH:mm:ss”的格式打印当前系统时间，总循环10次，每1s调用一次
* */

import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import java.util.SimpleTimeZone;

public class useLib {
    // 1 通过lambda,最简洁
    public static void main(String[] args) {
        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yy-MM-dd HH:mm:ss");
        new Thread(()->{
                    for(int i = 0; i < 10; i++) {
                        System.out.println("<M1" + dtf.format(LocalDateTime.now()));
                        try{
                            Thread.sleep(100);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
        }
        ).start();

        // 2 通过run方法,最直接
        System.out.println("Method 2: by run method");
        SimpleDateFormat d = new SimpleDateFormat("yy-MM-dd HH:mm:ss");
        new Thread() {
            @Override
            public void run() {
                for (int i = 0; i < 10; i ++) {
                    String str = d.format(new Date());
                    System.out.println(">M2" + str);
                    try{
                        Thread.sleep(100);
                    }catch(InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }.start();

       //3 通过runable接口,内部仍然需要覆盖run方法
        System.out.println("Method3: by runable interface");
        DateTimeFormatter dt = DateTimeFormatter.ISO_LOCAL_DATE_TIME;
        new print().print(dt.format(LocalDateTime.now()));
        new Thread(
                new Runnable() {
                    @Override
                    public void run() {
                        for (int i = 0; i < 10; i++) {
                           new print().print("[M3 " + dt.format(LocalDateTime.now()));
                           try{
                               Thread.sleep(100);
                           }catch (InterruptedException e){
                               e.printStackTrace();
                           }
                        }
                    }
                }
        ).start();


    }
}

class print{
    public void print(String str) {
        System.out.println(str);
    }
}

results：

Method 2: by run method
<M121-01-05 15:30:45
Method3: by runable interface

M221-01-05 15:30:45
2021-01-05T15:30:45.9785493
[M3 2021-01-05T15:30:45.9795468
<M121-01-05 15:30:46
M221-01-05 15:30:46
[M3 2021-01-05T15:30:46.0872608
<M121-01-05 15:30:46
M221-01-05 15:30:46
[M3 2021-01-05T15:30:46.1922955
<M121-01-05 15:30:46
M221-01-05 15:30:46
[M3 2021-01-05T15:30:46.297524
<M121-01-05 15:30:46
M221-01-05 15:30:46
[M3 2021-01-05T15:30:46.4022459
<M121-01-05 15:30:46
M221-01-05 15:30:46
[M3 2021-01-05T15:30:46.506966
<M121-01-05 15:30:46
M221-01-05 15:30:46
[M3 2021-01-05T15:30:46.611687
<M121-01-05 15:30:46
M221-01-05 15:30:46
[M3 2021-01-05T15:30:46.7164079
<M121-01-05 15:30:46
M221-01-05 15:30:46
[M3 2021-01-05T15:30:46.8211614
<M121-01-05 15:30:46
M221-01-05 15:30:46
[M3 2021-01-05T15:30:46.9258799

Process finished with exit code 0