How to Remove Characters from a String in Java?

Removing Occurrences of Characters from Strings in Java

In Java, the replace method can be used to replace occurrences of characters or substrings within a string. However, when working with characters, it's essential to use the overload that accepts CharSequence arguments (e.g., String) instead of char.

Problem Statement

Consider the following code:

String str = "TextX Xto modifyX";
str = str.replace('X',''); // This does not work

In this code, the intention is to remove all occurrences of the character 'X' from the string. However, the replace method is called with a single character argument, which does not work as intended.

Solution

To remove all occurrences of a character from a string, use the replace method with a CharSequence argument. For example:

str = str.replace("X", "");

By providing a String as the argument to replace, all occurrences of the character 'X' in the original string will be removed. Note that this overload of replace is case-sensitive, so if you need to remove case-insensitive occurrences, you can use equalsIgnoreCase first:

str = str.replace("X".equalsIgnoreCase("X"), "");

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