时间输入和显示

Question

我想让程序以我在displayTime方法中指定的格式输入并显示它。不要求用户输入直接跳到displayTime方法的值，并将值赋给00; 00; 00。有人可以帮助我，让我知道需要改变什么，所以它首先需要输入，然后显示？

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

试试这个：

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

至于你想创建和格式时的实际操作，你为什么不使用Java的日历API？

看一看这样的：

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

Answer 3

很多事情是错在你的榜样。首先，按照惯例，变量名称在Java中以小写字母开头，其次，您的方法getHour(int h)预计会传递一个小时，但也会从键盘请求它。对我来说没有意义。

这么说，我宁愿做这样的事情：

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()); 

} 

} 

，直到它在适当的范围内得到进入这将递归索要价值。