java string remove more than one space

/**
 * @author lautturi.com 
 * Java example: Java replace 2 or more spaces with one space in string
 */

import java.util.*;

public class Lautturi {
	public static void main(String[] args) {
		String str = "hello   java   world!";
		String newStr = str.trim().replaceAll(" +", " ");
		// Or
		// String newStr = str.trim().replaceAll("\\s+", " ");
		System.out.println(newStr);
	}
}

output:

hello java world!