甚至可以在带有terny运算符的java中添加0吗？ [英] is it even possible to add a 0 in java with terny operators?

问题描述

嗨我已经尝试过terny运算符，if else语句和解析int到字符串的所有内容，我正在制作一个读取4:01 4:02的时钟，但它输出4：1

Hi I've tried everything from terny operators, if else statements and parsing the int to a string, I am making a clock that reads 4:01 4:02 but instead it outputs 4:1

这是我的java代码，是否可以添加0？或者我还需要别的东西？

this is my java code, is it possible to add a 0? or I am going to need something else?

package bank;

import java.util.*;

/**
 *
 * @author will
 */
public class dClock {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here

        Calendar time = Calendar.getInstance();

        int min = 1;//time.get(Calendar.MINUTE);
        int hour =  time.get(Calendar.HOUR_OF_DAY);
        int blank = Integer.parseInt("0");

        int hourOfDay = ((hour > 12) ? (hour - 12) : hour);
        int zero = ((min > 10 ) ? min : blank+min);        
        System.out.println("The time is " + hourOfDay + ":" + zero );


    }

}

推荐答案

您只需使用 String.format（模式，数据），模式为％02d

• ％代表模式开始


• 2 表示输入应至少写成两个字符 __


• 0 但是如果输入短于两个字符，则用 0填充休息 _a - > 0a


• d 很短来自数字

• % represents start of pattern
• 2 means that input should be written as at least two characters __
• 0 but if input is shorter than two characters fill rest with 0 _a -> 0a
• d is short from digit

这意味着数字传递的数字应该用两个字符写，如果有空格（数字也是简短如 0 ， 1 ， 2 直到 9 ）用 0 填充前面的空格。

which all means that digit passed digit should be written using two characters and in case there would be empty space (number is too short like 0, 1, 2 till 9) fill space before it with 0.

格式化程序文档

演示：

String formatted = String.format("%02d:%02d", 4,2);
System.out.println(formatted);

输出： 04:02

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