1. 继承 Thread 类：

    private class MyThread extends Thread{
        @Override
        public void run() {
            //doSomething
        }
    }
    
    MyThread myThread = new MyThread();
    myThread.start();

2. 实现 Runnable 接口

    private class MyThread implements Runnable{

        @Override
        public void run() {
            //doSomeThing
        }
    }

    Thread myThread = new Thread(new MyThread());
    myThread.start();

常用简化模式：

  new Thread(new Runnable() {
     @Override
     public void run() {
         //todoList
     }
 }).start();

不同创建线程区别：

继承方式 不能资源共享, 实现 Runnable可以达到资源共享；
列子「卖票」

package threadTest;

public class TicketRunnable implements Runnable{

    private int ticket = 10;

    @Override
    public void run() {
        for(int i =0;i<10;i++){
            //添加同步快
            synchronized (this){
                if(this.ticket>0){
                    try {
                        //通过睡眠线程来模拟出最后一张票的抢票场景
                        Thread.sleep(100);
                        System.out.println(Thread.currentThread().getName()+"卖票---->"+(this.ticket--));
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }

    public static void main(String[] arg){
        TicketRunnable t1 = new TicketRunnable();
        new Thread(t1, "线程1").start();
        new Thread(t1, "线程2").start();
    }
}