Java Program to remove white spaces from String

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Program to remove white spaces

In this article we will see that how to remove white spaces form a string .

Concept :

Whitespace is a character which creates space on a page but not a visible mark. Common whitespace characters are including tabs and spaces. Removing all white space will result no gap between the words or character .

We will see 3 different ways to remove white spaces from a string.

Java Program to remove white spaces using for loop
Java program to remove white spaces using replaceAll() method
Java program to remove white spaces using replace() method

Method 1 : Java Program to remove white spaces using for loop

We can remove all white space in a string by using for loop .

Approach :

Enter a string .
Take a blank string .
Take a for loop for checking every character in the string .
For every character in entered string ,if the character is a blank space / white space don’t include in the new string & if the character is not a white space then include in the newly created string .
Print the newly created string.

Program :

import java.util.Scanner;
public class Main {  
    public static void main(String[] args)
    {  
        // CREATING OBJECT 
        Scanner sc = new Scanner(System.in);  
        // TAKING STRING FORM USER 
        System.out.print("Enter a string : ");  
        String s= sc.nextLine();   
        // CONVERTING TO CHAR. ARRAY 
        char[] s1 = s.toCharArray();  
        // CREATING A NEW BUFFER 
        StringBuffer s2 = new StringBuffer();  
           // CHECKING EACH CHARACTER OF CHAR. ARRAY FOR WHITE SPACE 
        for (int x= 0; x < s1.length; x++)
            if ((s1[x] != ' ') && (s1[x] != '\t'))
            // APPENDING ONLY CHARACTER TO BUFFER
                s2.append(s1[x]);  
        // CONVERTING BUFFER TO STING 
        String str = s2.toString(); 
        // PRINTING THE WHITE SPACE ELEMINATED STRING 
        System.out.println("After Eliminating Space Sting Is : " + str);  
    }  
}

Output:

Enter a string : BTech Geeks
After Eliminating Space Sting Is : BTechGeeks

Method 2 : Java program to remove white spaces using replaceAll() method

We can remove all white space in a string by using a built-in method called replaceAll() .

Approach :

Enter a string .
Use built in method replaceAll() to remove all the white space and store it to a new string .
Print the newly created string.

Program :

import java.util.Scanner;
public class Main {  
    public static void main(String[] args)
    {  
        // CREATING OBJECT 
        Scanner sc = new Scanner(System.in);  
        // TAKING STRING FORM USER 
        System.out.print("Enter a string : ");  
        String s= sc.nextLine();   
        // USING OF PRE-DEFINED METHOD
        // WHITE SPACES REMOVED USING REGEX
        String str = s.replaceAll("\\s+", ""); 
        // PRINTING THE WHITE SPACE ELEMINATED STRING 
        System.out.println("After Eliminating Space Sting Is : " + str);  
    }  
}

Output:

Enter a string : BTech Geeks 
After Eliminating Space Sting Is : BTechGeeks

Method 3 : Java program to remove white spaces using replace() method

We can remove all white space in a string by using a built-in method called replace() .

Approach :

Enter a string .
Use built in method replace() to remove all the white space and store it to a new string .
Print the newly created string

Program :

import java.util.Scanner;
public class Main {  
    public static void main(String[] args)
    {  
        // CREATING OBJECT 
        Scanner sc = new Scanner(System.in);  
        // TAKING STRING FORM USER 
        System.out.print("Enter a string : ");  
        String s= sc.nextLine();   
        // USING OF PRE-DEFINED BUILTIN METHOD
        String str = s.replace (" ", ""); 
        // PRINTING THE WHITE SPACE ELEMINATED STRING 
        System.out.println("After Eliminating Space Sting Is : " + str);  
    }  
}

Output:

Enter a string : BTech Geeks 
After Eliminating Space Sting Is : 
BTechGeeks

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