자바 프로그램 - Display the hour(시간 표시하기)

1. 요구사항

1. 12시간 시계를 만들 것. 형식은 아래 그림처럼.

24시간 시계 프로그램 정보

추가 조건 정수형 타입만 사용할 것!!

2. 분석

• 1)  표준시간대를 사용할 것.
• mills 부터 시작해 hour까지 %(mod), / (divde), int casting의 관계를 이용할 것.

3. 디자인

• 1)  함수 설정
• 함수 타입 - Void 
• parameter - 정수

4. 프로그램 작성 

(최초 작성일 9.18일)

updata내역

import java.util.Scanner;

public class Homework2CurrentTIme {
 public  static void main(String[] args) {
  long milliseconds;
  long seconds, currentSeconds;
  long minutes, currentMinutes;
  long hours, currentHours;
  
  milliseconds = System.currentTimeMillis();
  seconds = milliseconds / 1000;
  currentSeconds = seconds % 60;

  minutes = seconds / 60;
  currentMinutes = minutes % 60;
  
     hours = minutes / 60;
     
     currentHours = hours % 24;

     System.out.println("GMT Current time is " + currentHours + ":"
       + currentMinutes + ":" + currentSeconds);
     
     Scanner input = new Scanner(System.in);
     System.out.print("Enter the time zone offset to GMT: ");
     int time = input.nextInt();
     
     hours = hours + time;
     
     long ampm = hours / 12;
     if(ampm%2 == 0){
      currentHours = hours % 12;
      System.out.println("The Current time is " + currentHours + ":"
             + currentMinutes + ":" + currentSeconds + "AM"); 
     }
     else{
      currentHours = hours % 12;
      if(currentHours==0){
       currentHours = currentHours + 12;
       System.out.println("The Current time is " + currentHours + ":"
              + currentMinutes + ":" + currentSeconds + "PM"); 
       }
      else{
       System.out.println("The Current time is " + currentHours + ":"
              + currentMinutes + ":" + currentSeconds + "PM"); 
       }
      }
     }  
}

Updata 10.10일 함수화시키기

import java.util.Scanner;

public class Homework2CurrentTIme {
 
 static void TimezoneOffset(){
  
  long seconds, currentSeconds;
  long minutes, currentMinutes;
  long hours, currentHours;
  long milliseconds;
  
  milliseconds = System.currentTimeMillis();
  seconds = milliseconds / 1000;
  currentSeconds = seconds % 60;

  minutes = seconds / 60;
  currentMinutes = minutes % 60;
  
     hours = minutes / 60;
     
     currentHours = hours % 24;

     System.out.println("GMT Current time is " + currentHours + ":"
       + currentMinutes + ":" + currentSeconds);
 
  Scanner input = new Scanner(System.in);
     System.out.print("Enter the time zone offset to GMT: ");
     long time = input.nextInt();
     
     currentHours = currentHours + time;
     
     long ampm = currentHours / 12;
     if(ampm%2 == 0){
      currentHours = currentHours % 12;
      System.out.println("The Current time is " + currentHours + ":"
             + currentMinutes + ":" + currentSeconds + "AM"); 
     }
     else{
      
      currentHours = currentHours % 12;
      if(currentHours==0){
       currentHours = currentHours + 12;
       
       System.out.println("The Current time is " + currentHours + ":"
              + currentMinutes + ":" + currentSeconds + "PM"); 
       }
      else{
       System.out.println("The Current time is " + currentHours + ":"
              + currentMinutes + ":" + currentSeconds + "PM"); 
       }
      }
     }  

 public  static void main(String[] args) {
  TimezoneOffset();
 }
   
}

5. 고찰
1) 함수형대로 바꿔볼 것
2) 클린 코드에 대해 알아보고 클린 코드지향적 프로그램 수정후 다시 업로드.

System.currentTimeMillis()에 대해 조사