java并发（一）：初探线程的创建

线程的创建两种方式

创建线程有四种方式，今天主要演示的是两种：继承Thread，实现Runable接口

继承Thread创建线程

import lombok.extern.slf4j.Slf4j;

@Slf4j
class MyThread extends Thread{
    private  int count=0;
    @Override
    public void run(){
        for(int i=0;i<10;i++){
            if(count<10){
                log.info("{} :counter ={}",this.getName(),count++);
            }

        }

    }

}
@Slf4j
public class ThreadTest {
    public static void main(String[] args) {
       MyThread m1=new MyThread();
       MyThread m2=new MyThread();
       m1.start();
       m2.start();
    }
}

测试结果

2019-07-24 14:25:22,725   [Thread-0] INFO  MyThread  - Thread-0 :counter =0
2019-07-24 14:25:22,725   [Thread-1] INFO  MyThread  - Thread-1 :counter =0
2019-07-24 14:25:22,725   [Thread-1] INFO  MyThread  - Thread-1 :counter =1
2019-07-24 14:25:22,725   [Thread-1] INFO  MyThread  - Thread-1 :counter =2
2019-07-24 14:25:22,725   [Thread-0] INFO  MyThread  - Thread-0 :counter =1
2019-07-24 14:25:22,725   [Thread-0] INFO  MyThread  - Thread-0 :counter =2
2019-07-24 14:25:22,725   [Thread-1] INFO  MyThread  - Thread-1 :counter =3
2019-07-24 14:25:22,725   [Thread-0] INFO  MyThread  - Thread-0 :counter =3
2019-07-24 14:25:22,725   [Thread-1] INFO  MyThread  - Thread-1 :counter =4
2019-07-24 14:25:22,725   [Thread-1] INFO  MyThread  - Thread-1 :counter =5
2019-07-24 14:25:22,725   [Thread-1] INFO  MyThread  - Thread-1 :counter =6
2019-07-24 14:25:22,725   [Thread-1] INFO  MyThread  - Thread-1 :counter =7
2019-07-24 14:25:22,725   [Thread-1] INFO  MyThread  - Thread-1 :counter =8
2019-07-24 14:25:22,725   [Thread-1] INFO  MyThread  - Thread-1 :counter =9
2019-07-24 14:25:22,725   [Thread-0] INFO  MyThread  - Thread-0 :counter =4
2019-07-24 14:25:22,741   [Thread-0] INFO  MyThread  - Thread-0 :counter =5
2019-07-24 14:25:22,741   [Thread-0] INFO  MyThread  - Thread-0 :counter =6
2019-07-24 14:25:22,741   [Thread-0] INFO  MyThread  - Thread-0 :counter =7
2019-07-24 14:25:22,741   [Thread-0] INFO  MyThread  - Thread-0 :counter =8
2019-07-24 14:25:22,741   [Thread-0] INFO  MyThread  - Thread-0 :counter =9

Process finished with exit code 0

说明

两个线程，各自的变量，交替运行

实现Runable接口创建线程

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class RunableTest {
    public static void main(String[] args) {
        //内部类寄生于外部类，需要先创建外部类的对象
        RunableTest test = new RunableTest();
        MyThread m1 = test.new MyThread();
        //两个线程共享一个对象
        Thread t1 = new Thread(m1);
        Thread t2 = new Thread(m1);
        t1.start();
        t2.start();

    }

    class MyThread implements Runnable {
        public int count = 0;

        @Override
        public void run() {
            for (int i = 0; i < 10; i++) {
                //runable只继承了getClass方法
                if(count<10){
                    log.info("{} :counter ={}", Thread.currentThread().getName(), count++);
                }

            }
        }
    }

}

测试结果

2019-07-24 14:26:40,722   [Thread-1] INFO  RunableTest  - Thread-1 :counter =1
2019-07-24 14:26:40,722   [Thread-0] INFO  RunableTest  - Thread-0 :counter =0
2019-07-24 14:26:40,737   [Thread-0] INFO  RunableTest  - Thread-0 :counter =3
2019-07-24 14:26:40,737   [Thread-0] INFO  RunableTest  - Thread-0 :counter =4
2019-07-24 14:26:40,737   [Thread-0] INFO  RunableTest  - Thread-0 :counter =5
2019-07-24 14:26:40,737   [Thread-0] INFO  RunableTest  - Thread-0 :counter =6
2019-07-24 14:26:40,737   [Thread-0] INFO  RunableTest  - Thread-0 :counter =7
2019-07-24 14:26:40,737   [Thread-0] INFO  RunableTest  - Thread-0 :counter =8
2019-07-24 14:26:40,737   [Thread-0] INFO  RunableTest  - Thread-0 :counter =9
2019-07-24 14:26:40,737   [Thread-1] INFO  RunableTest  - Thread-1 :counter =2

Process finished with exit code 0

说明

两个线程，共享一个对象，交替运行。