centos7.x设置SSH免密码登陆

public class ThreadOne extends Thread{ public ThreadOne(){ } public void run(){ System.out.println(Thread.currentThread().getName()); } public static void main(String[] args){ ThreadOne threadOne = new ThreadOne(); threadOne.setName("继承Thread的方式实现线程"); threadOne.start(); System.out.println(Thread.currentThread().toString()); } }

public class ThreadTwo { 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() { System.out.println(Thread.currentThread().getName()+"-->通过实现接口的方式实现线程"); } }

public class ThreadThree { public static void main(String[] args) { Callable<Object> callable = new Tickets<Object>(); FutureTask<Object> task = new FutureTask<Object>(callable); Thread t = new Thread(task); System.out.println(Thread.currentThread().getName()); t.start(); } }  class Tickets<Object> implements Callable<Object>{ @Override public Object call() throws Exception { System.out.println(Thread.currentThread().getName()+"-->通过实现Callable接口通过FutureTask包装器来实现的线程"); return null; } }

public class ThreadFour{ private static int POOL_NUM = 10; public static void main(String[] args) throws InterruptedException { ExecutorService executorService = Executors.newFixedThreadPool(5); for(int i = 0; i<POOL_NUM; i++) { RunnableThread thread = new RunnableThread(); executorService.execute(thread); }  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()); } }