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?
推荐答案
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);
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