Re: Backing Up Objects

Piotr Kobzda <>
Tue, 10 Jul 2007 14:25:14 +0200
Twisted wrote:

Of course, it doesn't *really* mutate a "String" value, in that your
String is seen by the compiler as a different type to, and not
assignable to, java.lang.String.

Of course, my String is different type. It simply allows to implement
the scenario described by the OP:

public class Test {
     public static void m(String[] args) {
         class String {
             java.lang.String value;
             public java.lang.String toString() { return value; }
         String oldString = new String();
         String newString = oldString; // the OP's line (literally)
         oldString.value = "123";

On the other hand, there is another real way to mutate a String --
alter it when it's serialized, then deserialize it.

That way you cannot mutate the value of an existing String object. It
allows to create a new one only. To achieve similar effect, much easier
is to use a String's "copy constructor".


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