java多线程基础知识

1.ThrTest.java 继承Thread类方式

public class ThrTest extends Thread {
    private String name;

    public ThrTest() {

    }

    public ThrTest(String name) {
        this.name = name;
    }

    public void run() {
        for (int i = 0; i < 5; i++) {
            System.out.println(name + "运行     " + i);
        }
    }

    public static void main(String[] args) {
        ThrTest h1=new ThrTest("A");
        ThrTest h2=new ThrTest("B");
//        h1.run();
//        h2.run();
        h1.start();
        h2.start();
    }

}

2.RunnTest.java实现Runnable接口方式

public class RunnTest implements Runnable {
    private String name;

    public RunnTest() {

    }

    public RunnTest(String name) {
        this.name = name;
    }

    private int ticket = 5;  //5张票

    public void run() {
        for (int i=0; i<=20; i++) {
            if (this.ticket > 0) {
                System.out.println(this.name + Thread.currentThread().getName()+ "正在卖票"+this.ticket--);
            }
        }
    }

    public static void main(String[] args) {
        RunnTest h1=new RunnTest("线程A");             //资源共享

//        Thread demo= new Thread(h1,"1号窗口");
//        Thread demo1=new Thread(h1,"2号窗口");
//        Thread demo2=new Thread(h1,"3号窗口");

        Thread demo= new Thread(h1);
        Thread demo1=new Thread(h1);
        Thread demo2=new Thread(h1);

        demo.start();
        demo1.start();
        System.out.println("线程启动之前---》" + demo2.isAlive());
        demo2.start();
        System.out.println("线程启动之后---》" + demo2.isAlive());

    }
}