替换字符串中特定索引处的字符? [英] Replace a character at a specific index in a string?
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问题描述
我想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.
我所做的是:
String myName = "domanokz";
myName.charAt(4) = 'x';
这会产生错误。有什么方法可以做到这一点吗?
This gives an error. Is there any method to do this?
推荐答案
字符串在Java中是不可变的。您不能更改它们。
String are immutable in Java. You can't change them.
您需要创建一个替换了字符的新字符串。
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);
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