How Can I Modify a Specific Character in a Java String?

Replacing Characters in Strings

Question: How can I change a single character in a Java string at a specific index?

Example:

String myName = "domanokz";
myName.charAt(4) = 'x'; // Throws an error

Answer: Strings in Java are immutable, meaning once created, they cannot be modified. To change a character, you'll need to create a new string containing the desired change.

One solution is to use the substring method to extract the desired portion of the old string and concatenate it with the new character:

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

Another approach is to use a StringBuilder, which provides mutable string operations:

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

System.out.println(myName); // Prints "domanoxz"

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