So you thought Java strings were immutable?

General Discussions
#1

I was messing around with a bit of Java recently, and I just discovered that java.lang.String is in fact not 100% immutable

consider:


public class HelloWorld {

    public static void append(String s1, String s2) {
        try {
            Field value = String.class.getDeclaredField("value");
            value.setAccessible(true);
            value.set(s1, s2.toCharArray());
            Field count = String.class.getDeclaredField("count");
            count.setAccessible(true);
            count.set(s1, s2.length());
        } catch (Exception ex) {
        }
    }

    public static final String MESSAGE = "Hello world!";

    static {
        append(MESSAGE, "Lol goodbye");
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        System.out.println(MESSAGE);
    }

}