determine whether java string has whitespace in it

/**
 * @author lautturi.com
 * Java example: check whether string contains whitespace in java
 */

import java.util.*;

public class Lautturi {
	public static void main(String[] args) {

		String str = "Hello Java world";
		if(str.indexOf(' ') != -1){
			System.out.println("The string contains whitespace ");
		}

	}
}

output:

The string contains whitespace