final variables in Java
In Java, when final keyword is used with a variable of primitive data types (int, float, .. etc), value of the variable cannot be changed.
For example following program gives error because i is final.
When final is used with non-primitive variables (Note that non-primitive variables are always references to objects in Java), the members of the referred object can be changed. final for non-primitive variables just mean that they cannot be changed to refer to any other object
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