使用 Javas System.out.format 对齐整数值 [英] Using Javas System.out.format to align integer values

问题描述

我正在尝试生成看起来有点像这样的右对齐数字:

I am trying to produce right aligned numbers looking a bit like this:

  12345
   2345

但我显然不明白语法.我一直在尝试遵循这些说明.并提出以下尝试(它是整数，所以 d 并且我想要宽度为 7 和 0 的小数):

but I clearly does not understand the syntax. I have been trying to follow these instructions. and Come up with the following attempt (it is integers so d and I want width 7 and 0 decimals):

public class test {

    public static void main( String[] args ) {
        System.out.format("%7.0d%n", 12345);
        System.out.format("%7.0d%n",  2345);
    }
}

但无论我做什么，我似乎都以 IllegalFormatPrecisionException 告终.有没有办法使用这个工具来做到这一点?如果不是，你会怎么做?

but no matter what I do I seem to end up with IllegalFormatPrecisionException. Is there a way to do this using this tool? If not how else would you do it?

推荐答案

你可以这样做:

public class Test {
    public static void main( String[] args ) {
        System.out.format("%7d%n", 12345);
        System.out.format("%7d%n",  2345);
    }
}

本质上，这段代码要求 Java 用空格填充字符串，以便输出正好是 7 个字符.

Essentially this code asks Java to pad the string with spaces so that the output is exactly 7 characters.

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