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BAEL-4503
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‎core-java-modules/core-java-lang-3/src/main/java/com/baeldung/constantspatterns/Calculator.java‎

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package com.baeldung.constantspatterns;
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public class Calculator {
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public static final double PI = 3.14159265359;
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private static final double UPPER_LIMIT = 0x1.fffffffffffffP+1023;
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public enum Operation {
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ADD, SUBTRACT, DIVIDE, MULTIPLY
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}
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public double operateOnTwoNumbers(double numberOne, double numberTwo, Operation operation) {
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if (numberOne > UPPER_LIMIT) {
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throw new IllegalArgumentException("'numberOne' is too large");
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}
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if (numberTwo > UPPER_LIMIT) {
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throw new IllegalArgumentException("'numberTwo' is too large");
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}
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double answer = 0;
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switch (operation) {
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case ADD:
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answer = numberOne + numberTwo;
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break;
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case SUBTRACT:
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answer = numberOne - numberTwo;
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break;
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case DIVIDE:
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answer = numberOne / numberTwo;
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break;
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case MULTIPLY:
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answer = numberOne * numberTwo;
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break;
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}
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return answer;
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}
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}

‎core-java-modules/core-java-lang-3/src/main/java/com/baeldung/constantspatterns/CalculatorConstants.java‎

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package com.baeldung.constantspatterns;
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public interface CalculatorConstants {
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double PI = 3.14159265359;
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double UPPER_LIMIT = 0x1.fffffffffffffP+1023;
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enum Operation {
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ADD, SUBTRACT, MULTIPLY, DIVIDE
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};
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}

‎core-java-modules/core-java-lang-3/src/main/java/com/baeldung/constantspatterns/GeometryCalculator.java‎

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package com.baeldung.constantspatterns;
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public class GeometryCalculator implements CalculatorConstants {
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public static final double UPPER_LIMIT = 100000000000000000000.0;
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public double operateOnTwoNumbers(double numberOne, double numberTwo, Operation operation) {
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if (numberOne > UPPER_LIMIT) {
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throw new IllegalArgumentException("'numberOne' is too large");
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}
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if (numberTwo > UPPER_LIMIT) {
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throw new IllegalArgumentException("'numberTwo' is too large");
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}
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double answer = 0;
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switch (operation) {
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case ADD:
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answer = numberOne + numberTwo;
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break;
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case SUBTRACT:
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answer = numberOne - numberTwo;
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break;
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case DIVIDE:
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answer = numberOne / numberTwo;
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break;
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case MULTIPLY:
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answer = numberOne * numberTwo;
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break;
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}
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return answer;
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}
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}

‎core-java-modules/core-java-lang-3/src/main/java/com/baeldung/constantspatterns/calculations/MathConstants.java‎

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package com.baeldung.constantspatterns.calculations;
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public final class MathConstants {
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public static final double PI = 3.14159265359;
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public static final double GOLDEN_RATIO = 1.6180;
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public static final double GRAVITATIONAL_ACCELERATION = 9.8;
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public static final double EULERS_NUMBER = 2.7182818284590452353602874713527;
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public enum Operation {
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ADD, SUBTRACT, DIVIDE, MULTIPLY
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}
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private MathConstants() {
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}
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}

‎core-java-modules/core-java-lang-3/src/test/java/com/baeldung/constantspatterns/ConstantPatternUnitTest.java‎

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package com.baeldung.constantspatterns;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import org.junit.Test;
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public class ConstantPatternUnitTest {
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@Test
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public void givenTwoNumbersAndAdd_whenCallingCalculatorOperatOneTwoNumbers_correctAnswerReturned() {
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Calculator calculator = new Calculator();
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double expected = 4;
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double answer = calculator.operateOnTwoNumbers(2, 2, Calculator.Operation.ADD);
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assertEquals(expected, answer);
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}
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@Test
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public void givenTwoNumbersAndAdd_whenCallingGeometryCalculatorOperatOneTwoNumbers_correctAnswerReturned() {
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GeometryCalculator calculator = new GeometryCalculator();
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double expected = 4;
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double answer = calculator.operateOnTwoNumbers(2, 2, GeometryCalculator.Operation.ADD);
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assertEquals(expected, answer);
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}
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}

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