那些年踩过的坑

Posted 2020-11-25 miaowulj

1.遇到这么个题目

Write a function, which takes a non-negative integer (seconds) as input and returns the time in a human-readable format (HH:MM:SS)
HH = hours, padded to 2 digits, range: 00 - 99
MM = minutes, padded to 2 digits, range: 00 - 59
SS = seconds, padded to 2 digits, range: 00 - 59
The maximum time never exceeds 359999 (99:59:59)
测试代码如下

import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class ExampleTest {
  @Test
  public void Tests() {
    assertEquals("makeReadable(0)", "00:00:00", HumanReadableTime.makeReadable(0));
    assertEquals("makeReadable(5)", "00:00:05", HumanReadableTime.makeReadable(5));
    assertEquals("makeReadable(60)", "00:01:00", HumanReadableTime.makeReadable(60));
    assertEquals("makeReadable(86399)", "23:59:59", HumanReadableTime.makeReadable(86399));
    assertEquals("makeReadable(359999)", "99:59:59", HumanReadableTime.makeReadable(359999));
  }
}

于是,傻乎乎的写下了这么多代码

package com.practice.JUnit;

public class HumanReadableTime {
      public static String makeReadable(int seconds) {
        // Do something
        int hour = 0;
        int minute = 0;
        int second = 0;
        if(seconds < 60){
          hour = 0;
          minute = 0;
          second = seconds;
        }else if(seconds < 3600){
          hour = 0;
          minute = seconds / 60;
          second = seconds - minute * 60;
        }else if(seconds >= 3600){
          hour = seconds / 3600;
          minute = (seconds - hour * 3600)/60;
          second = (seconds - hour * 3600) - minute * 60;
        }
    
        String sst = null;
        String mst = null;
        String hst = null;
        
        if(second < 9) sst = "0" + second;
        else sst = second + "";
        if(minute < 9) mst = "0" + minute;
        else mst = minute + "";
        if(hour < 9) hst = "0" + hour;
        else hst = hour + "";
        String s = hst + ":" + mst + ":" + sst;
        return s;
      }
}

答案是：

public class HumanReadableTime {
  public static String makeReadable(int seconds) {
    return String.format("%02d:%02d:%02d", seconds / 3600, (seconds / 60) % 60, seconds % 60);
  }
}

(╬◣д◢)哦！万能的API