Java多线程状态及方法实例解析

public class MutliThreadDemo4 {
  public static void main(String[] args) {
    threadBlock();
    //threadPriority();
    //threadYield();
    
  }
  /**
   * 线程的阻塞
   */
  private static void threadBlock() {
    //创建Runnable接口实现类的对象
    Runnable r = () -> {
      for(int i = 0; i < 10; i++) {
        System.out.println(Thread.currentThread().getName() + ":" + i);
        //线程休眠(由运行状态到阻塞状态，时间过了回到就绪态，重新争抢)，直观上表现为停顿打印
        try {
          Thread.sleep(1000);
        }catch(InterruptedException e){
          e.printStackTrace();
        }
      }
    };
    //实例化
    new Thread(r, "甲").start();  
  }
  
  /**
   * 线程的优先级
   */
  private static void threadPriority() {

    Runnable r = () -> {
      for(int i = 0; i < 10; i++) {
        System.out.println(Thread.currentThread().getName() + ":" + i);
      }
    };
    Thread t1 = new Thread(r, "甲");
    Thread t2 = new Thread(r, "乙");
    
    //设置优先级，必须在开始执行（start）之前
    //设置线程的优先级，只是修改这个线程可以去抢到CPU时间片的概率。
    //并不是优先级高的线程一定能抢到CPU时间片
    //优先级的设置，是一个整数(0,10]的整数，默认是5
    t1.setPriority(10);
    t2.setPriority(1);
    
    t1.start();
    t2.start();
    
  }
  /**
   * 线程的礼让
   */
  private static void threadYield() {  
    //线程释放自己的CPU资源，由运行状态，回到就绪状态
    //匿名内部类
    Runnable r = new Runnable() {
      public void run() {
        for (int i = 0; i < 10; i++) {
          System.out.println(Thread.currentThread().getName() + ":" + i);
          if (i == 3) {
            Thread.yield();
          }
        }
      }
    };
    Thread thread1 = new Thread(r, "thread-1");
    Thread thread2 = new Thread(r, "thread-2");
    
    thread1.start();
    thread2.start();  
  }  
}