[HackerRank] Time Conversion

来源：互联网发布：a star算法c 编辑：程序博客网时间：2024/05/13 13:08

Problem

Given a time in AM/PM format, convert it to military (24-hour) time.

Input Format

A single string containing a time in 12-hour clock format.

Output Format

Convert and print the given time in 24-hour format.

Sample Input

07:05:45PM

Sample Output

19:05:45

Solution

1. using char[]

import java.io.*;import java.util.*;public class Solution {    public static void main(String[] args) {        Scanner in = new Scanner(System.in);        String str = in.next();        char[] ch = str.toCharArray();        char[] res = Arrays.copyOfRange(ch, 0, 8);        if(ch[8] == 'A' && str.substring(0,2).equals("12")) {            res[0] = '0';            res[1] = '0';        }        else if(ch[8] =='P' && !str.substring(0,2).equals("12")) {            String hour = "" + (Integer.parseInt(str.substring(0,2)) + 12);            char[] h = hour.toCharArray();            res[0] = h[0];            res[1] = h[1];        }        System.out.println(res);    }}

2. using StringBuilder()

import java.io.*;import java.util.*;public class Solution {    public static void main(String[] args) {        Scanner in = new Scanner(System.in);        String str = in.next();        char[] inChar = str.toCharArray();        StringBuilder sb = new StringBuilder();        if(str.charAt(8) == 'A' && str.substring(0,2).equals("12")) {            sb.append("00");            sb.append(str.substring(2, 8));        }        else if(str.charAt(8) =='P' && !str.substring(0,2).equals("12")) {            String s = "" + (Integer.parseInt(str.substring(0,2)) + 12);            sb.append(s);            sb.append(str.substring(2, 8));        }        else sb.append(str.substring(0, 8));        System.out.println(sb.toString());    }}

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