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package threadlocal;import java.text.SimpleDateFormat; import java.util.Date; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors;/*** 描述： 加鎖來解決線程安全問題*/ public class ThreadLocalNormalUsage04 {public static ExecutorService threadPool = Executors.newFixedThreadPool(10);static SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");public static void main(String[] args) throws InterruptedException {for (int i = 0; i < 1000; i++) {int finalI = i;threadPool.submit(new Runnable() {@Overridepublic void run() {String date = new ThreadLocalNormalUsage04().date(finalI);System.out.println(date);}});}threadPool.shutdown();}public String date(int seconds) {//參數的單位是毫秒，從1970.1.1 00:00:00 GMT計時Date date = new Date(1000 * seconds);String s = null;synchronized (ThreadLocalNormalUsage04.class) {s = dateFormat.format(date);}return s;} }

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