package Thread.threadLocal;
/*
* ThreadLocal实例
*
* 两个线程产生的åºå·å…±äº«ä¸€ä¸ªTestå®žä¾‹ï¼Œä½†æ²¡æœ‰ç›¸äº’å¹²æ‰°ï¼Œå› ä¸ºé€šè¿‡ThreadLocal为æ¯ä¸€ä¸ªè¯¥å˜é‡çš„线程æ供独立的å˜é‡å‰¯æœ¬ï¼Œè€Œä¸ä¼šå½±å“其他其他线程的所对应的副本
*
* åŒåŒæ¥æœºåˆ¶ï¼ˆé”ï¼‰ä¸€æ ·ï¼Œä¸ºäº†è§£å†³å¤šçº¿ç¨‹è®¿é—®ç›¸åŒå˜é‡å†²çªçš„问题
* åŒæ¥ï¼šä»¥æ—¶é—´æ¢ç©ºé—´
* ThreadLocal:以空间æ¢æ—¶é—´
*
* */
import java.text.DateFormat;
import java.text.SimpleDateFormat;
public class Test {
private static final ThreadLocal threadLocal=new ThreadLocal(){
//返回线程局部å˜é‡çš„åˆå§‹å€¼
protected DateFormat initialValue() {
// TODO Auto-generated method stub
return new SimpleDateFormat("yyyy-MM-dd");
}
};
private static ThreadLocal seqNum=new ThreadLocal(){
protected Integer initialValue() {
return 0;
}
};
//获å–下一个åºåˆ—值
public int nextSqlNum(){
seqNum.set(seqNum.get()+1);
return seqNum.get();
}
public static void main(String[] args) {
//System.out.println(threadLocal.get().format(new Date()));
Test test=new Test();
TestClient testClient=new TestClient(test);
TestClient testClient1=new TestClient(test);
testClient.start();
testClient1.start();
}
}
class TestClient extends Thread{
private Test test;
public TestClient(Test test) {
this.test=test;
}
@Override
public void run() {
//打å°å‡ºä¸‰ä¸ªåºåˆ—å·
for(int i=0;i