实现方式：
1,继承Thread类
public class ThreadTest extends Thread {
@Override
public void run() {
System.out.println(Thread.currentThread().getName());
}
public static void main(String[] args) {
ThreadTest test=new ThreadTest();
test.start();
}
}
2,实现一个Runable接口
public class ThreadTest implements Runnable {
@Override
public void run() {
// TODO Auto-generated method stub
}
public static void main(String[] args) {
ThreadTest t1=new ThreadTest();
Thread thread=new Thread(t1);
thread.start();
}
}
3,线程池实现方式Executors
//创建一个可重用固定线程数的线程池
ExecutorService pool = Executors. newSingleThreadExecutor();
//创建一个可重用固定线程数的线程池
ExecutorService pool = Executors.newFixedThreadPool(2);
//创建一个可重用固定线程数的线程池
ExecutorService pool = Executors.newCachedThreadPool();
例如：
//创建实现了Runnable接口对象
Thread t1 = new MyThread();
Thread t2 = new MyThread();
Thread t3 = new MyThread();
Thread t4 = new MyThread();
Thread t5 = new MyThread();
//将线程放入池中进行执行
pool.execute(t1);
pool.execute(t2);
pool.execute(t3);
pool.execute(t4);
pool.execute(t5);
//关闭线程池
pool.shutdown();
}