我可以在 Java 中乘以字符串来重复序列吗? [英] Can I multiply strings in Java to repeat sequences?

问题描述

我有类似以下内容:

int i = 3;
String someNum = "123";

我想将 i "0" 附加到 someNum 字符串.它有什么方法可以像 Python 那样乘以一个字符串来重复它吗?

I'd like to append i "0"s to the someNum string. Does it have some way I can multiply a string to repeat it like Python does?

所以我可以走了:

someNum = sumNum + ("0" * 3);

或类似的东西?

在这种情况下，我的最终结果是:

Where, in this case, my final result would be:

123000".

推荐答案

在没有依赖的纯 Java 中最简单的方法是以下单行:

The easiest way in plain Java with no dependencies is the following one-liner:

new String(new char[generation]).replace("", "-")

用重复次数替换generation，用你想要重复的字符串(或字符)替换-".

Replace generation with number of repetitions, and the "-" with the string (or char) you want repeated.

所做的只是创建一个包含 n 个 0x00 字符的空字符串，其余的由内置的 String#replace 方法完成.

All this does is create an empty string containing n number of 0x00 characters, and the built-in String#replace method does the rest.

这是复制和粘贴的示例:

Here's a sample to copy and paste:

public static String repeat(int count, String with) {
    return new String(new char[count]).replace("", with);
}

public static String repeat(int count) {
    return repeat(count, " ");
}

public static void main(String[] args) {
    for (int n = 0; n < 10; n++) {
        System.out.println(repeat(n) + " Hello");
    }

    for (int n = 0; n < 10; n++) {
        System.out.println(repeat(n, ":-) ") + " Hello");
    }
}

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