多线程创建方式

1、继承Thread

public class ThreadTest {
 
    public static void main(String[] args) {
        MyThread myThread = new MyThread();
        myThread.start();
        for (int i = 0; i < 1001; i++) {
            if(i % 2 != 0){
                System.out.println(i + "main");
            }
        }
    }
}
 
class MyThread extends Thread{
    @Override
    public void run() {
        for (int i = 0; i < 1001; i++) {
            if(i % 2 == 0){
                System.out.println(i);
            }
        }
    }
}

Thread.currentThread()获取当前线程，setName getName 设置线程名称

if (i ==20){
    myThread.join();
}
当前线程进入阻塞，等myThread线程执行完了再执行

2、实现runaable接口

public class ThreadTest1{
    public static void main(String[] args) {
        MyThread1 myThread1 = new MyThread1();
        Thread thread = new Thread(myThread1);
        thread.start();
        for (int i = 1001; i < 2000; i++) {
            System.out.println(Thread.currentThread().getName()+i);
        }
    }
 
}
 
class MyThread1 implements Runnable{
    @Override
    public void run() {
        for (int i = 0; i < 1000; i++) {
            System.out.println(Thread.currentThread().getName()+i);
        }
    }
}