Question

How to count the white spaces in a string in Java

Answer 1

public class CountWhiteSpacesInString_Java {
 
    public static void main(String[] args) 
    {
        String s = "Java \n  Programming \r Language \t ";

        int WhiteSpaces = s.length() - s.toLowerCase().replaceAll("[ \r\n\t]", "").length(); 
         
        System.out.println("WhiteSpaces = " + WhiteSpaces);
    }
}
 

/*
run:
 
WhiteSpaces = 10
 
*/

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Answer 2

public class CountWhiteSpacesInString_Java {
 
    public static void main(String[] args) 
    {
        String s = "Java \n  Programming \r Language \t ";

        int WhiteSpaces = 0; 
        
        for (char ch : s.toCharArray()) {
            if (ch == ' ' || ch == '\n' || ch == '\t' || ch == '\r') {
                WhiteSpaces++;
            }
        }
         
        System.out.println("WhiteSpaces = " + WhiteSpaces);
    }
}

 
/*
run:
 
WhiteSpaces = 10
 
*/

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Answer 3

public class CountWhiteSpacesInString_Java
{
	private static int countWhitespaceCharacters(String str) {
		int count = 0;

		for (char ch: str.toCharArray()) {
			if (Character.isWhitespace(ch)) {
				count++;
			}
		}

		return count;
	}

	public static void main(String[] args)
	{
		String str = "Java \n  Programming \r Language \t ";

		System.out.println("WhiteSpaces = " + countWhitespaceCharacters(str));
	}
}

 
/*
run:
 
WhiteSpaces = 10
 
*/

 

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