How can I find whitespace in a String?

Question

How can I check to see if a String contains a whitespace character, an empty space or \" \". If possible, please provide a Java example.

For example: String

Answer 1

Use this code, was better solution for me.

public static boolean containsWhiteSpace(String line){
    boolean space= false; 
    if(line != null){


        for(int i = 0; i < line.length(); i++){

            if(line.charAt(i) == ' '){
            space= true;
            }

        }
    }
    return space;
}

Answer 2

String str = "Test Word";
            if(str.indexOf(' ') != -1){
                return true;
            } else{
                return false;
            }

Answer 3

This will tell if you there is any whitespaces:

Either by looping:

for (char c : s.toCharArray()) {
    if (Character.isWhitespace(c)) {
       return true;
    }
}

or

s.matches(".*\\s+.*")

And StringUtils.isBlank(s) will tell you if there are only whitepsaces.

Answer 4

Use Apache Commons StringUtils:

StringUtils.containsWhitespace(str)

Answer 5

import java.util.Scanner;
public class camelCase {

public static void main(String[] args)
{
    Scanner user_input=new Scanner(System.in);
    String Line1;
    Line1 = user_input.nextLine();
    int j=1;
    //Now Read each word from the Line and convert it to Camel Case

    String result = "", result1 = "";
    for (int i = 0; i < Line1.length(); i++) {
        String next = Line1.substring(i, i + 1);
        System.out.println(next + "  i Value:" + i + "  j Value:" + j);
        if (i == 0 | j == 1 )
        {
            result += next.toUpperCase();
        } else {
            result += next.toLowerCase();
        }

        if (Character.isWhitespace(Line1.charAt(i)) == true)
        {
            j=1;
        }
        else
        {
            j=0;
        }
    }
    System.out.println(result);

Answer 6

You could use Regex to determine if there's a whitespace character. \s.

More info of regex here.