开启线程的方式

1、实现Runnable接口

package test;



public class ThreadTest implements Runnable{
    public void tt(){
        Thread t = new Thread(this);
        t.start();
    }

    @Override
    public void run() {
        while(true){
        }
    }
    public static void main(String[] args) {
        ThreadTest t = new ThreadTest();
        Thread t2 = new  Thread(new Runnable() {
            @Override
            public void run() {
            }
        });
        t2.start();
        t.tt();
    }
}

2、继承Thread类

package test;

public class test1 extends Thread{
    public void tt(){
        this.start();
    }
    @Override
    public void run() {
        System.out.println("sfsdfdsf");
    }
    public static void main(String[] args) {
        test1 t= new test1();
        t.tt();
    }
}

3、内包格式

Thread t2 = new  Thread(new Runnable() {
            @Override
            public void run() {
                // TODO Auto-generated method stub
                
            }
        });
        t2.start();

获取虚拟机中的所有线程

Map<Thread, StackTraceElement[]> maps=Thread.getAllStackTraces();
        for(Thread t:maps.keySet()){
            System.out.println(t.getName());//线程名
            System.out.println(t.isAlive());//是否还在执行
            
        }