Java - How to remove characters from a String at a specific index?

In this post, I will show you how to remove the characters/string from a string at a specific index. In Java, there is no such function available in String class. We have the following two alternates available

• StringBuilder
• StringBuffer

Option 1 (StringBuilder)

    StringBuilder builder = new StringBuilder("hello to Java");

        

    builder.delete( 5, 8 );

    System.out.println( builder );//OUTPUT hello Java

To remove a single character




    StringBuilder builder = new StringBuilder("hello to Java");
     
    builder.deleteCharAt( 0 );
    System.out.println( builder );//OUTPUT ello to Java



Option 2 (StringBuffer)

    StringBuffer buffer = new StringBuffer ("hello to Java");

    buffer.delete( 5, 8 );

    System.out.println( buffer);//OUTPUT hello Java

To remove a single character

    StringBuffer buffer = new StringBuffer ("hello to Java");
     
    buffer.deleteCharAt( 0 );
    System.out.println( buffer );//OUTPUT ello to Java

Option 3 (Our own implementation)

    

    public static String remove(String string,int offset,int numberOfCharacters) {

        if(offset >= string.length()) {

            return string;

        }

        

        String firstPart = string.substring( 0, offset );

        String secondPart = string.substring( offset );

        

        secondPart = secondPart.substring( numberOfCharacters );

        

        return firstPart.concat( secondPart );

    }

To remove a single character

    public static String remove(String string,int offset) {

        if(offset>= string.length()) {

            return string;

        }

        

        return string.substring(0, offset);

    }