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Java - remove first n characters from string

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Created by:

Zachariah

298

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

Quick solution:

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String text = "ABCD";
int n = 3;
String result = text.substring(n);
​
System.out.println(result);  // D

Practical examples

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1. Using String `substring()` method

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

Syntax:

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substring(int startIndex, int endIndex);

Note:

By default endIndex is the end of the string, so we don't need to specify it.

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(n);
​
        System.out.println(result);  // D
    }
}

Output:

xxxxxxxxxx
 
D

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 first n 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 first n characters
        sb.delete(0, n);
​
        System.out.println(sb);  // D
    }
}

Output:

xxxxxxxxxx
 
D

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 first n 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 first n characters
        sb.delete(0, n);
​
        System.out.println(sb);
    }
}