Object variables in Java always point to the real object ... ve learned about object references. In the code example below, you see the immutable String and the mutable StringBuilder class.

Another way to create strings is to use the new keyword, as in the following example. String s1 = new String("Hello world!"); That code will create an s1 string object and a reference variable. As ...

For example ... In terms of fully immutable objects, the historic workaround has been to declare instance variables private and restrict access through public setters and getters. More recently, Java ...