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java語言

什么是java線程池框架

時間:2025-03-12 11:59:32 java語言 我要投稿

什么是java線程池框架

  多線程是程序員面試時常常會面對的問題,對多線程概念的掌握和理解水平,也常常被用來衡量一個人的編程實力。不錯,普通的多線程已經(jīng)不容易了。

  一、線程池結(jié)構(gòu)圖

  二、示例

  定義線程接口

  6public class MyThread extends Thread {@Overridepublicvoid run() {System.out.println(Thread.currentThread().getName() + "正在執(zhí)行");}}

  1:newSingleThreadExecutor

  10ExecutorService pool = Executors. newSingleThreadExecutor();Thread t1 = new MyThread();Thread t2 = new MyThread();Thread t3 = new MyThread();//將線程放入池中進行執(zhí)行pool.execute(t1);pool.execute(t2);pool.execute(t3);//關(guān)閉線程池pool.shutdown();

  輸入結(jié)果:

  3pool-1-thread-1正在執(zhí)行pool-1-thread-1正在執(zhí)行pool-1-thread-1正在執(zhí)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();//將線程放入池中進行執(zhí)行pool.execute(t1);pool.execute(t2);pool.execute(t3);pool.execute(t4);pool.execute(t5);pool.shutdown();

  輸入結(jié)果:

  4pool-1-thread-1正在執(zhí)行pool-1-thread-2正在執(zhí)行pool-1-thread-1正在執(zhí)行pool-1-thread-2正在執(zhí)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();//將線程放入池中進行執(zhí)行pool.execute(t1);pool.execute(t2);pool.execute(t3);pool.execute(t4);pool.execute(t5);//關(guān)閉線程池pool.shutdown();

  輸入結(jié)果:

  5pool-1-thread-2正在執(zhí)行pool-1-thread-4正在執(zhí)行pool-1-thread-3正在執(zhí)行pool-1-thread-1正在執(zhí)行pool-1-thread-5正在執(zhí)行

  4 :ScheduledThreadPoolExecutor

  14ScheduledExecutorService pool = Executors.newScheduledThreadPool(2);pool.scheduleAtFixedRate(new Runnable() {//每隔一段時間就觸發(fā)異常 @Override public void run() { //throw new RuntimeException(); System.out.println("================"); }}, 1000, 2000, TimeUnit.MILLISECONDS);pool.scheduleAtFixedRate(new Runnable() {//每隔一段時間打印系統(tǒng)時間,證明兩者是互不影響的 @Override public void run() { System.out.println("+++++++++++++++++"); }}, 1000, 2000, TimeUnit.MILLISECONDS);

  輸入結(jié)果:

  4================+++++++++++++++++++++++++++++++++++++++++++++++++++

  三、線程池核心參數(shù)

  corePoolSize : 池中核心的線程數(shù)

  maximumPoolSize : 池中允許的最大線程數(shù)。

  keepAliveTime : 當線程數(shù)大于核

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