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Define a constant value and use it

Using the final keyword to declare a variable. The final keyword specifies that the value of a variable is final and cannot be changed. It is a convention in Java to write constants in uppercase letters. public class MainClass {   public static void main(String[] arg) {     final int FEET_PER_YARD = 3;          // Constant values     final double MM_PER_INCH = 25.4;      // that cannot be changed     System.out.println(FEET_PER_YARD);     System.out.println(MM_PER_INCH);        } } 3 25.4