extract number from string in java

/**
 * @author lautturi.com 
 * Java example: get digits from string
 */

import java.util.*;

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

		String str = "The price is $ 79";
		
        String number = str.replaceAll("[^0-9]", "");
        
        System.out.println(number);

	}
}

output:

79