時間輸入和顯示

Question

我想讓程序以我在displayTime方法中指定的格式輸入並顯示它。不要求用戶輸入直接跳到displayTime方法的值，並將值賦給00; 00; 00。有人可以幫助我，讓我知道需要改變什麼，所以它首先需要輸入，然後顯示？

import java.util.Scanner; 
public class Time { 
Scanner input = new Scanner(System.in); 
private int hour = 0; 
private int minute = 0; 
private int second = 0; 

public void getHour(int h) { 
h = hour; 
System.out.println("Enter Hour:"); 
h = input.nextInt(); 

} 
public void getMinute(int m) { 
    m = minute; 
    System.out.println("Enter Minute:"); 
    m = input.nextInt(); 
} 
public void getSecond(int s) { 
    s = second; 
    System.out.println("Enter Second:"); 
    s = input.nextInt(); 
} 

public String displayTime() { 
return String.format("%02d:%02d:%02d", hour, minute, second); 
} 
} 
public class Test { 

public static void main (String args[]) { 
Time TimeObject = new Time(); 
System.out.println(TimeObject.displayTime()); 
} 
} 

Answer 1

試試這個：

class Time { 
private int hour = 0; 
private int minute = 0; 
private int second = 0; 

public void getHour(int h) { 
    hour = h; 
} 
public void getMinute(int m) { 
    minute = m; 
} 

public void getSecond(int s) { 
    second = s; 
} 
public String displayTime() { 
    return String.format("%02d:%02d:%02d", hour, minute, second); 
} 
} 
public class Test{ 
public static void main(String[] args) { 
    int h, m, s; 
    Scanner input = new Scanner(System.in); 
    System.out.println("Enter Hour:"); 
    h = input.nextInt(); 
    System.out.println("Enter Minute:"); 
    m = input.nextInt(); 
    System.out.println("Enter Second:"); 
    s = input.nextInt(); 
    Time TimeObject = new Time(); 
    TimeObject.getHour(h); 
    TimeObject.getMinute(m); 
    TimeObject.getSecond(s); 
    System.out.println(TimeObject.displayTime()); 
} 
} 

Answer 2

至於你想創建和格式時的實際操作，你爲什麼不使用Java的日曆API？

看一看這樣的：

https://www.mkyong.com/java/java-date-and-calendar-examples/

Answer 3

很多事情是錯在你的榜樣。首先，按照慣例，變量名稱在Java中以小寫字母開頭，其次，您的方法getHour(int h)預計會傳遞一個小時，但也會從鍵盤請求它。對我來說沒有意義。

這麼說，我寧願做這樣的事情：

public class Time { 

Scanner input = new Scanner(System.in); 
private int hours = 0; 
private int minutes = 0; 
private int seconds = 0; 

private int getHours() { 
    System.out.println("Hours:"); 
    int hour = input.nextInt(); 
    if (hour < 0 || hour >= 24) { 
     System.out.println("Wrong input. Hours must be between 0 and 23.Try again..."); 
     return getHours(); 
    } 
    return hour; 
} 

private int getMinutes() { 
    System.out.println("Minutes:"); 
    int minute = input.nextInt(); 
    if (minute < 0 || minute >= 60) { 
     System.out.println("Wrong input. Minutes must be between 0 and 59. Try again..."); 
     return getMinutes(); 
    } 
    return minute; 
} 

private int getSeconds() { 
    System.out.println("Seconds:"); 
    int second = input.nextInt(); 
    if (second < 0 || second >= 60) { 
     System.out.println("Wrong input. Seconds must be between 0 and 59. Try again..."); 
     return getSeconds(); 
    } 
    return second; 
} 

public void getTime() { 
    hours = getHours(); 
    minutes = getMinutes(); 
    seconds = getSeconds(); 
} 

public String displayTime() { 
    return String.format("%02d:%02d:%02d", hours, minutes, seconds); 
} 
} 

而主要：

public class Test { 

public static void main(String args[]) { 
    Time time = new Time(); 
    time.getTime(); 
    System.out.println(time.displayTime()); 

} 

} 

，直到它在適當的範圍內得到進入這將遞歸索要價值。