Immutable Classes

Java String is final and immutable. Yet, java string contents can be modified

The article discusses differences between finalness and immutability of classes and unchangeability of contents. On example of java.lang.String demostrated that content of immutable class’s object can be changed

What it takes to make a java class immutable?And what does it mean, actually?

The article discusses what classes produce immutable objects and what guarantees JVM provides fro immutable objects