Java多线程-----线程池详解

package com.thread.threadpool;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 创建一个可缓存线程池，如果线程池长度超过处理需要，可灵活回收空闲线程，若无可回收，则新建线程
 * 
 * @author yyx 2019年1月5日
 */
public class CachedThreadPool {
    public static void main(String[] args) {
        ExecutorService executorService = Executors.newCachedThreadPool();
        for (int i = 1; i <= 10; i++) {
            final int index = i;
            executorService.execute(new Runnable() {

                @Override
                public void run() {
                    System.out.println(Thread.currentThread().getName() + "当前运行到:" + index);
                    try {
                        Thread.sleep(3000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            });
        }
    }
}

package com.thread.threadpool;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 创建一个定长线程池，可控制线程最大并发数，超出的线程会在队列中等待
 * 
 * @author yyx 2019年1月5日
 */
public class FixedThreadPool {
    public static void main(String[] args) {
        ExecutorService executorService = Executors.newFixedThreadPool(3);
        for (int i = 1; i <= 10; i++) {
            final int index = i;
            executorService.execute(new Runnable() {

                @Override
                public void run() {
                    System.out.println(Thread.currentThread().getName() + "当前运行到:" + index);
                    try {
                        Thread.sleep(3000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            });
        }
    }
}

package com.thread.threadpool;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 创建一个单线程化的线程池，它只会用唯一的工作线程来执行任务，保证所有任务按照指定顺序(FIFO, LIFO, 优先级)执行
 * 
 * @author yyx 2019年1月5日
 */
public class SingleThreadExecutor {
    public static void main(String[] args) {
        ExecutorService executorService = Executors.newSingleThreadExecutor();
        for (int i = 1; i <= 10; i++) {
            final int index = i;
            executorService.execute(new Runnable() {

                @Override
                public void run() {
                    System.out.println(Thread.currentThread().getName() + "当前运行到:" + index);
                    try {
                        Thread.sleep(3000);
                    } catch (Exception ex) {
                        ex.printStackTrace();
                    }
                }
            });
        }
    }
}

package com.thread.threadpool;

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/**
 * 创建一个定长线程池，支持定时及周期性任务执行
 * 
 * @author yyx 2019年1月5日
 */
public class ScheduledThreadPool {
    public static void main(String[] args) {
        ScheduledExecutorService scheduledExecutorService = Executors.newScheduledThreadPool(5);
        scheduledExecutorService.schedule(new Runnable() {

            @Override
            public void run() {
                System.out.println("延迟3秒执行");
            }
        }, 3, TimeUnit.SECONDS);

        scheduledExecutorService.scheduleAtFixedRate(new Runnable() {

            @Override
            public void run() {
                System.out.println("延迟3秒后每1秒执行一次");

            }
        }, 3, 1, TimeUnit.SECONDS);
    }
}