Java replace characters in string

/**
 * @author lautturi.com 
 * Java example: replace chars in java string
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {
		
		String str = "hello lautturi java world!";
		String newstr = str.replace(' ', '-');
		System.out.println(str);
		System.out.println(newstr);
		
	}
}

output:

hello lautturi java world!
hello-lautturi-java-world!