threadisalive.java

Java 程序设计源码 只提供了部分

class TestThread extends Thread implements Runnable {
  static int count;
  private int number;
  private String name;

  TestThread(String name) {
    this.number = ++count;
    this.name = name;
    this.setName(name);

    start();
  }

  public void run() {
    System.out.println(this.name + " is created, No. " + this.number);

    try {
      sleep(100);
    }
    catch(InterruptedException e) {
      System.out.println("interrupted.");
    }
  }
}

public class ThreadIsAlive {
  public static void main(String[] args) {
    TestThread[] t = new TestThread[3];

    for(int i = 0; i < 3; i++) {
      t[i] = new TestThread("Thread " + i);
    }

    for(int i = 0; i < 3; i++) {
      System.out.println(t[i].getName() + " running ? " + t[i].isAlive());
    }

    for(int i = 0; i < 3; i++)
    {
      System.out.println(t[i].getName() + " running ? " + t[i].isAlive());
    }
    System.out.println();

    for(int i = 0; i < 3; i++) {
      try {
        t[i].join();
      }
      catch(InterruptedException e) {
        System.out.println(" interrupted.");
      }
    }

      for(int i = 0; i < 3; i++) {
        System.out.println(t[i].getName() + " is ending ? " + t[i].isAlive());
      }

      System.out.println("main thread end.");

  }
}