Java-ThreadLocal的簡單例子

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內容：ThreadLocal：允許我們建立只能被同一個線程讀寫的變數，例如Web應用中將變數從前端到後台，並且需要在這次請求的線程中始終可以隨時擷取到。內部實現是通過一個ThreadLocalMap這個Map結構來實現的，將線程對象作為Key，變數副本作為Value。

public class TestThreadLocal {public static class MyRunnable1 implements Runnable {private ThreadLocal<Integer> threadlocal = new ThreadLocal<Integer>();@Overridepublic void run() {threadlocal.set(new Random().nextInt(10));try {Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(Thread.currentThread() + " : " + threadlocal.get());}}public static void main(String[] args) {System.out.println("start");MyRunnable1 runnable = new MyRunnable1();Thread thread1 = new Thread(runnable);Thread thread2 = new Thread(runnable);thread1.start();thread2.start();}}

Java-ThreadLocal的簡單例子