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java線程池框架解析方法
Java對象實例的鎖一共有四種狀態(tài):無鎖,偏向鎖,輕量鎖和重量鎖。原始脫離框架的并發(fā)應用大部分都需要手動完成加鎖釋放,最直接的就是使用synchronized和volatile關鍵字對某個對象或者代碼塊加鎖從而限制每次訪問的次數(shù),從對象之間的競爭也可以實現(xiàn)到對象之間的協(xié)作。但是這樣手動實現(xiàn)出來的應用不僅耗費時間而且性能表現(xiàn)往往又有待提升。
一、線程池結構圖
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);//關閉線程池pool.shutdown();
輸入結果:
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);//關閉線程池pool.shutdown();
輸入結果:
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)
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