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Editorial Team
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Asked: 2026-06-03T14:20:59+00:00

Consider this code snippet public class ConstantFolding { static final int number1 = 5;

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Consider this code snippet

public class ConstantFolding {

   static final  int number1 = 5;
   static final  int number2 = 6;

   static int number3 = 5;
   static int number4 = 6;

   public static void main(String[ ] args) {
      int product1 = number1 * number2;             //line A
      int product2 = number3 * number4;             //line B
   }
}

What is the difference between the line marked as line A and the line marked as line B?

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1 Answer

  1. Editorial Team

    The difference is that the multiplication required for product1 is performed at compile-time as number1 and number2 are constants.

    The calculation for product2 is compiled at execution time, as the values of number3 and number4 can change. Indeed, you could change the values and then call main again.

    See sections 15.28 and 4.12.4 of the JLS for more information about constant expressions and constant variables.

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