什么是java线程池框架
多线程是程序员面试时常常会面对的问题，对多线程概念的掌握和理解水平，也常常被用来衡量一个人的.编程实力。不错，普通的多线程已经不容易了。
一、线程池结构图
二、示例
定义线程接口
6public class MyThread extends Thread {@Overridepublicvoid run() {System.out.println(Thread.currentThread().getName() + "正在执行");}}
1：newSingleThreadExecutor
10ExecutorService pool = Executors. newSingleThreadExecutor();Thread t1 = new MyThread();Thread t2 = new MyThread();Thread t3 = new MyThread();//将线程放入池中进行执行pool.execute(t1);pool.execute(t2);pool.execute(t3);//关闭线程池pool.shutdown();
输入结果：
3pool-1-thread-1正在执行pool-1-thread-1正在执行pool-1-thread-1正在执行
2：newFixedThreadPool
13ExecutorService pool = Executors.newFixedThreadPool(3);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);pool.shutdown();
输入结果：
4pool-1-thread-1正在执行pool-1-thread-2正在执行pool-1-thread-1正在执行pool-1-thread-2正在执行
3 :newCachedThreadPool
14ExecutorService pool = Executors.newCachedThreadPool();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();
输入结果：
5pool-1-thread-2正在执行pool-1-thread-4正在执行pool-1-thread-3正在执行pool-1-thread-1正在执行pool-1-thread-5正在执行
4 :ScheduledThreadPoolExecutor
14ScheduledExecutorService pool = Executors.newScheduledThreadPool(2);pool.scheduleAtFixedRate(new Runnable() {//每隔一段时间就触发异常 @Override public void run() { //throw new RuntimeException(); System.out.println("================"); }}, 1000, 2000, TimeUnit.MILLISECONDS);pool.scheduleAtFixedRate(new Runnable() {//每隔一段时间打印系统时间，证明两者是互不影响的 @Override public void run() { System.out.println("+++++++++++++++++"); }}, 1000, 2000, TimeUnit.MILLISECONDS);
输入结果：
4================+++++++++++++++++++++++++++++++++++++++++++++++++++
三、线程池核心参数
corePoolSize ： 池中核心的线程数
maximumPoolSize ： 池中允许的最大线程数。
keepAliveTime ： 当线程数大于核
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