照线程池七大参数分别是corePoolSize、maximumPoolSize、keepAliveTime、unit、workQueue、threadFactory、handler

//Executors.newSingleThreadExecutor(); 单线程 //源码分析： public stat吸胞判ic Executo概光度哪针元rService newSingleThreadExecutor() { return new FinalizableDelegatedExecutorService (new ThreadPoolExecutor(1, 1, 0L, TimeUnit.MILLISECONDS, new LinkelockingQueueRunnable())); } //Executors.newFixedThreadPo的助汉宽什ol(5); 固定线程个数 //源码分析： public sttic ExecutorService newFixedThreadPool(int nThreads) { return new ThreadPoolExecutor(nThreads, nThreads, 0L, TimeUnit.MILLISECO扬NDS, new Li供字伯获黄协章充逐分底nkedBlockingQ温务位ueueRunnable()) //Executors.newCachedThreadPl(); 缓存池，可扩展 //源码任跑饭谓源跟不娘分析： public static ExecutorService newCachedThreadPool { return new ThreadPoolExecutor(0, Integer.MA罗充级孙的田余陈收X_VALUE,//21亿 OOM：Out Of Mem坚杨画座见飞ory,内存溢出 , TimeUnit.SECONDS, new SynchronousQueueRunnable()); } 继续点击ThradPoolExecutor ，查看源码： //吃搞粮本质： ThreadPoolExecutor public ThreadPoolExecutor(int corePoolSize,//核心线程池大小 int maximumPoolSize,//最大核心线程池大小 long keepAliveTime,//超时了没有人调用会释放 TimeUnit unit, //超时单位 BlockingQueu还求东矛难eRunnable workQueue,/报耐级伤/阻塞队列 Threa里离刚地等传衡创正样江dFactory threadFactory,//线程工厂：创建线程的，一般不用动 RejectedExecutionHandler handler//拒绝策略) { if (corePoo元段营搞没结未兵节良lSize 0 maximumPoolSize = 0 maximumPoolSize cPoolSize keepAliveTime 0) throw new IllegalArgum激演内诗汽操也原白entExceptio(); if (workQueue == null threadFactory == null handler == null) throw new NullPointerException(); this.acc = System.getSecurityManager() == null ? n被买原材祖ull : AccesController.getContext(); this.corePoolSize 问报= corePoolze; this.maximumPoolSize = maximumPoolSize; thisorkQueue = workQueue; this.keepAliveTime = unit.t任料德料吃养间生二oNanos(keepAliveTime); this.threa培散烟肉争兵dFactory = threadFactory; this.handler = handler; } int corePoolSize,//核心宪妒费如味率染学快讨斤线程池大小 int maxi则记即件采适技列充低证mumPoolSize,//最大核心线程池大小 long keepAliv守底层著科儿虽eTime,//超时了没有人调用会释放 TimeUn妒it unit, //超 BlockingQueueR灯unnable workQueue,//阻塞队换落死雷怕钟困会冲迅位列 ThreadFactory threadFary,//线程工厂：创建线程的，一般不用动 RejectedExe列金终得叫伯试比济起cutionHandler handler//拒绝策略 package pol; import java.util.concurrent.*; public class Dem技手许候装先唱被重o2 { public static void main(Strig[] args) { // 自定义线程池！工作 T双伯逐压多毛hreadPoo长天和于岁采全秋标lExecutor(七大参数) ExecutorService threadPool = new ThreadPoolExecutor( 2, 5, 3, TimeUnit.SECONDS, new LikedBlockingDeque(3), Executors.defaultTh轻随readFactory() 有四种拒绝策略，用适合于自己的！ new ThreadPoolExecutor.DiscardOldestPolicy() //队列满了，尝试和最早的竞争，也不会抛出异常！ ); try { //最大承载： Deque + max //超过 RejectedEx是各ecutionException抛出拒绝执行异常 for (int i = 1黄义兵新龙空州清粉脱; i = 9; i++) { //使用了线程池之后，使用线程池来创建线配装往程 threadPool.execute(()-{ System.out.print止甲ln(Thread.究宽专运轻望块探currentThread()已革金今灯.getName()+ OK！); }); } } catch (Exc强小房停松月略花越早eption e) { e.ptStackTrace(); } finally { //线程池用完，程序结饭流木白降句束，关闭线程池 threadPool.shutdown(); } } } 目录