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1. Reverse String2. Check Palindrome String3. Count Vowels4. Count Consonants5. Count Words6. Remove Whitespace7. Remove Duplicate Characters8. Anagram Check9. String Rotation10. Frequency of Characters11. Longest Word12. Shortest Word13. Replace Substring14. Reverse Words in Sentence15. Sort Characters16. Convert to Title Case17. Count Uppercase Letters18. Count Lowercase Letters19. Extract Numbers20. Validate Email (Regex)21. Validate Password22. Check Pangram23. Split & Join Strings24. String Compression25. String Permutations

Remove Whitespace in Java

Remove all whitespace characters from a string.

BeginnerModule 4: String ProgramsExample 6 of 25
remove-whitespace.java
1import java.util.Scanner;
2

3public class Main {
4    public static void main(String[] args) {
5        Scanner sc = new Scanner(System.in);
6        System.out.print("Enter a string: ");
7        String s = sc.nextLine();
8

9        String noSpace = s.replaceAll("\\s+", "");
10        System.out.println("Without whitespace: " + noSpace);
11        sc.close();
12    }
13}

Output

Enter a string: a b  c
Without whitespace: abc

What's going on

We use a regex \\s+ to match all whitespace and replace with empty string.

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