java 给定AM / PM格式的时间，将其转换为军事（24小时）时间。注意：午夜是12小时制的12:00:00 AM和24小时的00:00:00

Posted 2021-05-08

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String time = in.next();
        
        if(time.contains("AM")){
            time = time.replace("AM", "");
            String[] timeArr = time.split(":");
            
            if(timeArr[0].equals("12")){
                timeArr[0] = "00";
            }
            
            time = timeArr[0] + ":" + timeArr[1] + ":" + timeArr[2];   
        }
        
        else if(time.contains("PM")){
            time = time.replace("PM", "");
            String[] timeArr = time.split(":");
            if(!timeArr[0].equals("12")){
                timeArr[0] = Integer.toString(Integer.parseInt(timeArr[0]) + 12);
                
            }
            
            time = timeArr[0] + ":" + timeArr[1] + ":" + timeArr[2];
            
        }
        
        System.out.println(time);
        
    }
}