// strings/Immutable.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

public class Immutable {

public static String upcase(String s) {

return s.toUpperCase();

}

public static void main(String[] args) {

String q = "howdy";

System.out.println(q); // howdy

String qq = upcase(q);

System.out.println(qq); // HOWDY

System.out.println(q); // howdy

}

}

/* Output:

howdy

HOWDY

howdy

*/