Question

Design a program that will receive a valid time in the 24-hour format (e.g. 2305) and convert to its equivalent 12-hour format (e.g. 11:05 PM). Assume 0000 in 24-hour format is 12:00AM in 12-hour format. The program should continue accepting inputs until a sentinel value of 9999 is entered. Hint: Use System.out.printf statements with "d" (Links to an external site.) to match output format. Ex: If the input is: g

Answer 1

Answer:

import java.io.*;

public class Main

{

  public static void main(String[] args) throws IOException {

      BufferedReader bufferObject=new BufferedReader(new InputStreamReader(System.in));

      String stringObject=bufferObject.readLine();

      while(!stringObject.equals("99:99AM")){

      System.out.println(convertedTime(stringObject));

      stringObject=bufferObject.readLine();

      }

  }

  public static String convertedTime(String stringObject){

  String s=stringObject.substring(stringObject.length()-2);

  String[] timeObject=stringObject.substring(0,5).split(":");

  if(s.equals("AM")){

  if(timeObject[0].equals("12")) return "00"+timeObject[1];

  else return timeObject[0]+timeObject[1];

  }

  else{

  if(timeObject[0].equals("12")) return "12"+timeObject[1];

  else{

  int hours=Integer.valueOf(timeObject[0]);

  timeObject[0]=String.valueOf(12+hours);

  return timeObject[0]+timeObject[1];

  }

  }

 

  }

}

Explanation:

• Inside the main method run a while loop until stringObject is not equal to the string "99:99AM".
• Call the convertedTime method and display the results.
• Use the same hours and minutes except for 12th hour If the time is in AM.
• Use "00" instead of 12, if it is 12th hour.
• Add hours to 12, if the time is in PM and don't change anything in case of 12.