Java program to remove characters in a string except alphabets

October 13, 2022

Remove character in a String except alphabet

In this article we will learn how to Remove character in a String except alphabet.

Take String input from the user and store it in a variable called “s”(in this case). After that use replaceAll() method which was present in string class the work of replaceAll() method is to replace some old thing with some new thing so here we’re using a regular expression to replace character in a string with blank spaces.

Java program to remove characters in a string except alphabets

Algorithm

  • Take String input from user and store it in a variable called “s”.
  • After that use replaceAll() method.
  • Write regex to replace character with whitespaces like this s.replaceAll(“[^a-zA-Z]”,””);.
  • After that simply print the String after removing character except alphabet.

Code in Java

Output

helloworld

Method 2

Run 
class Main
{
    // function to remove characters and
    // print new string
    static void removeSpecialCharacter(String s)
    {
        for (int i = 0; i < s.length(); i++)
        {
            // Finding the character whose
            // ASCII value fall under this
            // range
            if (s.charAt(i) < 'A' || s.charAt(i) > 'Z' && s.charAt(i) < 'a' || s.charAt(i) > 'z')
            {

                // erase function to erase
                // the character
                s = s.substring(0, i) + s.substring(i + 1);
                i--;
            }
        }
        System.out.print(s);
    }
    // Driver code
    public static void main(String[] args)
    {
        String s = "$P*r;e..pi, ns'ta^?";
        removeSpecialCharacter(s);
    }
}

Output

Prepinsta
Run 
import java.util.Scanner;

class Main {

public static void main(String[] args) {
     String s = "hel1456lo56wor%^ld";
     s=s.replaceAll("[^a-zA-Z]","");
     System.out.println(s);
   }
}
 
 

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18 comments on “Java program to remove characters in a string except alphabets”


  • PRASHANTH

    import java.util.Scanner;

    public class removeCharacters {
    public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String str = sc.nextLine();
    for (int i = 0; i = ‘a’ && str.charAt(i) = ‘A’ && str.charAt(i) <= 'Z')
    System.out.print(str.charAt(i));
    }
    }
    }

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