When NOT to use the static keyword in Java?

One reason why you may not want it to be static is to allow it to be overridden in a subclass. In other words, the behaviour may not depend on the data within the object, but on the exact type of the object. For example, you might have a general collection type, with an isReadOnly property which would return false in always-mutable collections true in always-immutable collections, and depend on instance variables in others.

Two of the greatest evils you will ever encounter in large-scale Java applications are.

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