How to Remove the Last Character from a String in Java?

How do you remove the last character from a string in Java without affecting other characters?

public String removeLastCharacter(String str) {
    if (str != null && str.length() > 0) {
        return str.substring(0, str.length() - 1);
    }
    return str; // Return original string if null or empty
}

To remove the last character from a string in Java, it's essential to leverage the `substring` method without using `replace`, which may impact other instances of characters in the string. Here's how to properly achieve this task.

public String removeLastCharacter(String str) {
    if (str != null && str.length() > 0) {
        return str.substring(0, str.length() - 1);
    }
    return str; // Return original string if null or empty
}

Causes

• Using `str.replace()` method erroneously replaces occurrences of the last character throughout the string.
• Failing to check if the string is null or empty can lead to exceptions.

Solutions

• Use the `substring()` method to extract a portion of the string, ensuring that only the last character is omitted.
• Always check if the string is null or has a length greater than zero before attempting to modify it.

Mistake: Using `str.replace()` instead of `str.substring()`

Solution: Use `str.substring(0, str.length() - 1)` to remove the last character correctly.

Mistake: Not checking for null or empty strings before manipulating them

Solution: Ensure the string is not null and has a length greater than zero to avoid `StringIndexOutOfBoundsException`.