替换字符串中特定索引处的字符?

问题描述：

我正在尝试替换字符串中特定索引处的字符.

I'm trying to replace a character at a specific index in a string.

我正在做的是:

String myName = "domanokz";
myName.charAt(4) = 'x';

这会产生错误.有没有办法做到这一点?

This gives an error. Is there any method to do this?

答

String 在 Java 中是不可变的.你不能改变它们.

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);

或者你可以使用 StringBuilder:

Or you can use a StringBuilder:

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

System.out.println(myName);