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Final Variables

You can prefix a variable declaration with the keyword final to make its value unchangeable. You can make both local variables and class fields final. final int numberOfMonths = 12; Once assigned a value, the final value cannot change. Attempting to change it will result in a compile error. final float pi = (float) 22 / 7; The casting (float) after 22 / 7 is needed to convert the value of division to float. Otherwise, an int will be returned and the pi variable will have a value of 3.0, instead of 3.1428.