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Java - remove last n characters from string

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Created by:

Payne

654

In this article, we would like to show you how to remove the last n characters from the string in Java.

Quick solution:

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String text = "ABCD";
int n = 3;
String result = text.substring(0, text.length() - n);
​
System.out.println(result);  // A

Practical examples

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1. Using String `substring()` method

Edit

In this example, we use String substring() method to create a new result substring from the text string without the last n = 3 characters.

Syntax:

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substring(int startIndex, int endIndex);

Practical example:

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public class Example {
​
    public static void main(String[] args) {
        String text = "ABCD";
        int n = 3;
        String result = text.substring(0, text.length() - n);
​
        System.out.println(result);  // A
    }
}

Output:

xxxxxxxxxx
 
A

2. Using StringBuilder `delete()` method

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In this example, we create sb StringBuilder object from the text string, then we use delete() method on the sb to delete the last n = 3 characters.

Syntax:

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delete(int startIndex, int endIndex);

Practical example:

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public class Example {
​
    public static void main(String[] args) {
        String text = "ABCD";
        int n = 3;
​
        // Create StringBuilder object
        StringBuilder sb = new StringBuilder(text);
​
        // Remove last n = 3 characters
        sb.delete(text.length() - n, text.length());
​
        System.out.println(sb);  // A
    }
}

Output:

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A

3. Using StringBuffer `delete()` method

Edit

In this example, we create sb StringBuffer object from the text string, then we use delete() method on the sb to delete the last n = 3 characters.

Syntax:

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delete(int startIndex, int endIndex);

Practical example:

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public class Example {
​
    public static void main(String[] args) {
        String text = "ABCD";
        int n = 3;
​
        // Create StringBuffer object
        StringBuffer sb = new StringBuffer(text);
​
        // Remove last n = 3 characters
        sb.delete(text.length() - n, text.length());
​
        System.out.println(sb);  // A
    }
}