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