java SimpleDateFormat如何转换局部变量

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

public class SimpleDateFormatExample {

    public static void main(String[] args) {

        // 创建线程池

        ExecutorService threadPool = Executors.newFixedThreadPool(10);

        // 执行 10 次时间格式化

        for (int i = 0; i < 10; i++) {

            int finalI = i;

            // 线程池执行任务

            threadPool.execute(new Runnable() {

                @Override

                public void run() {

                    // 创建 SimpleDateFormat 对象

                    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("mm:ss");

                    // 创建时间对象

                    Date date = new Date(finalI * 1000);

                    // 执行时间格式化并打印结果

                    System.out.println(simpleDateFormat.format(date));

                }

            });

        }

        // 任务执行完之后关闭线程池

        threadPool.shutdown();

    }

}