测试程序运行时间

程序本体

package com.example.util;

import java.time.LocalDateTime;

public class TimeUtil {

    public interface Task {
        void execute();
    }

    public static void check(String title, Task task) {
        if (task == null) {
            return;
        }
        title = (title == null) ? "" : ("[" + title + "]");
        System.out.println(title);
        System.out.println("开始：" + LocalDateTime.now());
        long beginTime = System.currentTimeMillis();
        task.execute();
        long endTime = System.currentTimeMillis();
        System.out.println("结束：" + LocalDateTime.now());
        double delta = (endTime - beginTime) / 1000.0;
        System.out.println("耗时：" + delta + "秒");
        System.out.println("=========");

    }
}

调用

package com.example;

import com.example.util.TimeUtil;

public class Main {

    public static void main(String[] args) {
        TimeUtil.check("testAdd", new TimeUtil.Task() {
            @Override
            public void execute() {
                long res = 0;
                for (long i = 0; i < 1000000000; i ++) {
                    res += i;
                }
                System.out.println(res);
            }
        });
    }
}

运行结果

Python直接用time库就行

import time

# 程序开始时的时间
time_start = time.time()
# 程序结束时系统时间
time_end = time.time()
# 两者相减
print('totally cost', time_end - time_start)