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?ThreadLocal中有map會存儲每個線程的信息，這樣，每個線程相當于擁有了局部變量。

package com.baobaotao;class Ticket{public int count = 0;public static ThreadLocal<Integer> threadLocal = new ThreadLocal<Integer>(){protected Integer initialValue(){return 0;};};public String getTicNum(){count = threadLocal.get()+1;threadLocal.set(count);return count+"";} }class ThreadLocalNew extends Thread{private Ticket tkt;public ThreadLocalNew(Ticket tkt){this.tkt = tkt;}@Overridepublic void run() {for(int i=0; i<5; i++){System.out.println(getName()+" ticketNum:"+tkt.getTicNum());}}}public class MyThreadLocal {public static void main(String[] args){Ticket tkt = new Ticket();ThreadLocalNew t1 = new ThreadLocalNew(tkt);ThreadLocalNew t2 = new ThreadLocalNew(tkt);ThreadLocalNew t3 = new ThreadLocalNew(tkt);t1.start();t2.start();t3.start();} }

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