package src.threadlocal;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**

• 描述： 利用ThreadLocal，给每个线程分配自己的dateFormat对象，保证了线程安全，高效利用内存
  */
  public class ThreadLocalNormalUsage05 {

  public static ExecutorService threadPool = Executors.newFixedThreadPool(10);

  public static void main(String[] args) throws InterruptedException {
  for (int i = 0; i < 1000; i++) {
  int finalI = i;
  threadPool.submit(new Runnable() {
  @Override
  public void run() {
  try{
  String date = new ThreadLocalNormalUsage05().date(finalI);
  System.out.println(ThreadSafeFormatter.dateFormatThreadLocal);
  System.out.println(date);
  }finally {
  System.out.println("*******");
  ThreadSafeFormatter.dateFormatThreadLocal.remove();
  System.out.println(ThreadSafeFormatter.dateFormatThreadLocal.get());
  System.out.println("+++++++");
  }

           }
       });
   }
   threadPool.shutdown();
  

  }

  public String date(int seconds) {
  //参数的单位是毫秒，从1970.1.1 00:00:00 GMT计时
  Date date = new Date(1000 * seconds);
  // SimpleDateFormat dateFormat = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”);
  SimpleDateFormat dateFormat = ThreadSafeFormatter.dateFormatThreadLocal.get();
  return dateFormat.format(date);
  }
  }

class ThreadSafeFormatter {

public static ThreadLocal<SimpleDateFormat> dateFormatThreadLocal = new ThreadLocal<SimpleDateFormat>() {
    @Override
    protected SimpleDateFormat initialValue() {
        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    }
};

/*public static ThreadLocal<SimpleDateFormat> dateFormatThreadLocal2 = ThreadLocal
        .withInitial(() -> new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));*/

}

上面是我的代码 我在finally中 将threadlocal删除 为什么 每次打印的还是同一个 对象，这里的删除不对吗