Java替换字符串特定位置的字符?

问题描述

我正在尝试替换字符串特定位置的字符.

I am trying to replace a character at a specific position of a string.

例如:

String str = "hi";

将字符串位置 #2 (i) 替换为另一个字母k"

replace string position #2 (i) to another letter "k"

我该怎么做?谢谢！

推荐答案

Petar Ivanov 对 替换字符串问题中特定索引处的字符

字符串在 Java 中是不可变的.您无法更改它们.

String are immutable in Java. You can't change them.

您需要创建一个替换字符的新字符串.

You need to create a new string with the character replaced.

String myName = "domanokz";
String newName = myName.substring(0,4)+'x'+myName.substring(5);

或者您可以使用 StringBuilder:

Or you can use a StringBuilder:

StringBuilder myName = new StringBuilder("domanokz");
myName.setCharAt(4, 'x');

System.out.println(myName);

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