Thread之线程池

import lombok.SneakyThrows;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
/**
 * @author layman
 */
public class Demo02 {
    
    
    public static void main(String[] args) {
    
    
        Runnable runnable = new Demo02Runnable();
        //缓存线程池
        //ExecutorService es = Executors.newCachedThreadPool();
        //创建固定容量为2的线程池，轮流执行
        //ExecutorService es = Executors.newFixedThreadPool(2);
        //创建单一线程池，串行执行
//        ExecutorService es = Executors.newSingleThreadExecutor();
//        for (int i = 0; i < 10; i++) {
    
    
//            es.execute(runnable);
//        }
        //线程池中保留2个线程，即便它们是空闲的
        //ScheduledExecutorService es = Executors.newScheduledThreadPool(2);
        ScheduledExecutorService es = Executors.newSingleThreadScheduledExecutor();
        System.out.println("准备执行时间： " + System.currentTimeMillis());
        //延迟3秒执行
        es.schedule(runnable,3, TimeUnit.SECONDS);
        /**
         * runnable:执行的线程
         * initialDelay：初始化执行需要延迟的时间
         * period：每次执行的间隔
         * unit：时间单位
         */
        //es.scheduleAtFixedRate(runnable,3,4,TimeUnit.SECONDS);
        //关闭线程池
        //es.shutdown();
    }
}
class Demo02Runnable implements Runnable{
    
    
    private SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd HH:mm:ss");
    private static long waitTime = 1000L;
    @SneakyThrows
    @Override
    public void run() {
    
    
        System.out.println(Thread.currentThread().getName()+" 开始于："+sdf.format(new Date(System.currentTimeMillis())));
        //System.out.println(Thread.currentThread().getName()+" 开始于："+System.currentTimeMillis());
        synchronized (this){
    
    
            waitTime += 100L;
        }
        Thread.sleep(waitTime);
        //System.out.println(Thread.currentThread().getName()+" 结束于："+System.currentTimeMillis());
        System.out.println(Thread.currentThread().getName()+" 结束于："+sdf.format(new Date(System.currentTimeMillis())));
    }
}