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SimpleDateFormat线程不安全,通过ThreadLocal使用

zidea 2022-03-12 阅读 79
java
public class ThreadLocalDemo2 {
    private static final ThreadLocal<SimpleDateFormat> THREAD_LOCAL = new ThreadLocal<SimpleDateFormat>() {
        @Override
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        }
    };

    public static void main(String[] args) {
        ExecutorService service = Executors.newFixedThreadPool(100);
        for (int i = 0; i < 20; i++) {
            service.execute(() -> {
                for (int j = 0; j < 10; j++) {
                    try {
                        System.out.println(THREAD_LOCAL.get().parse("2020-03-12 20:54:12"));
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });
        }
        service.shutdown();
    }
}
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