Java多线程实现四种方式原理详解

public class ThreadDemo01 extends Thread{
  public ThreadDemo01(){
    //编写子类的构造方法，可缺省
  }
  public void run(){
    //编写自己的线程代码
    System.out.println(Thread.currentThread().getName());
  }
  public static void main(String[] args){ 
    ThreadDemo01 threadDemo01 = new ThreadDemo01(); 
    threadDemo01.setName("我是自定义的线程1");
    threadDemo01.start();    
    System.out.println(Thread.currentThread().toString()); 
  }
}

public class ThreadDemo02 {
  public static void main(String[] args){ 
    System.out.println(Thread.currentThread().getName());
    Thread t1 = new Thread(new MyThread());
    t1.start(); 
  }
}

class MyThread implements Runnable{
  @Override
  public void run() {
    // TODO Auto-generated method stub
    System.out.println(Thread.currentThread().getName()+"-->我是通过实现接口的线程实现方式！");
  }  
}

public class ThreadDemo03 {
  /**
   * @param args
   */
  public static void main(String[] args) {
    // TODO Auto-generated method stub
    Callable<Object> oneCallable = new Tickets<Object>();
    FutureTask<Object> oneTask = new FutureTask<Object>(oneCallable);
    Thread t = new Thread(oneTask);
    System.out.println(Thread.currentThread().getName());
    t.start();
  }
}
class Tickets<Object> implements Callable<Object>{

  //重写call方法
  @Override
  public Object call() throws Exception {
    // TODO Auto-generated method stub
    System.out.println(Thread.currentThread().getName()+"-->我是通过实现Callable接口通过FutureTask包装器来实现的线程");
    return null;
  }  
}

public class ThreadDemo05{
  private static int POOL_NUM = 10;   //线程池数量

  /**
   * @param args
   * @throws InterruptedException 
   */
  public static void main(String[] args) throws InterruptedException {
    // TODO Auto-generated method stub
    ExecutorService executorService = Executors.newFixedThreadPool(5); 
    for(int i = 0; i<POOL_NUM; i++) { 
      RunnableThread thread = new RunnableThread();
      //Thread.sleep(1000);
      executorService.execute(thread); 
    }
    //关闭线程池
    executorService.shutdown(); 
  }  
}

class RunnableThread implements Runnable {   
  @Override
  public void run() { 
    System.out.println("通过线程池方式创建的线程：" + Thread.currentThread().getName() + " "); 
  } 
}