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Merge pull request #10127 from amdegregorio/BAEL-4503 

BAEL-4503
This commit is contained in:
Eric Martin 2020-10-18 21:40:33 -05:00 committed by GitHub
parent 000275f9f7 7d297f344f
commit d6d7661771
5 changed files with 118 additions and 0 deletions
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37
core-java-modules/core-java-lang-3/src/main/java/com/baeldung/constantspatterns/Calculator.java Normal file
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package com.baeldung.constantspatterns;
public class Calculator {
public static final double PI = 3.14159265359;
private static final double UPPER_LIMIT = 0x1.fffffffffffffP+1023;
public enum Operation {
ADD, SUBTRACT, DIVIDE, MULTIPLY
}
public double operateOnTwoNumbers(double numberOne, double numberTwo, Operation operation) {
if (numberOne > UPPER_LIMIT) {
throw new IllegalArgumentException("'numberOne' is too large");
}
if (numberTwo > UPPER_LIMIT) {
throw new IllegalArgumentException("'numberTwo' is too large");
}
double answer = 0;
switch (operation) {
case ADD:
answer = numberOne + numberTwo;
break;
case SUBTRACT:
answer = numberOne - numberTwo;
break;
case DIVIDE:
answer = numberOne / numberTwo;
break;
case MULTIPLY:
answer = numberOne * numberTwo;
break;
}
return answer;
}
}

10
core-java-modules/core-java-lang-3/src/main/java/com/baeldung/constantspatterns/CalculatorConstants.java Normal file
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package com.baeldung.constantspatterns;
public interface CalculatorConstants {
double PI = 3.14159265359;
double UPPER_LIMIT = 0x1.fffffffffffffP+1023;
enum Operation {
ADD, SUBTRACT, MULTIPLY, DIVIDE
};
}

32
core-java-modules/core-java-lang-3/src/main/java/com/baeldung/constantspatterns/GeometryCalculator.java Normal file
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package com.baeldung.constantspatterns;
public class GeometryCalculator implements CalculatorConstants {
public static final double UPPER_LIMIT = 100000000000000000000.0;
public double operateOnTwoNumbers(double numberOne, double numberTwo, Operation operation) {
if (numberOne > UPPER_LIMIT) {
throw new IllegalArgumentException("'numberOne' is too large");
}
if (numberTwo > UPPER_LIMIT) {
throw new IllegalArgumentException("'numberTwo' is too large");
}
double answer = 0;
switch (operation) {
case ADD:
answer = numberOne + numberTwo;
break;
case SUBTRACT:
answer = numberOne - numberTwo;
break;
case DIVIDE:
answer = numberOne / numberTwo;
break;
case MULTIPLY:
answer = numberOne * numberTwo;
break;
}
return answer;
}
}

16
core-java-modules/core-java-lang-3/src/main/java/com/baeldung/constantspatterns/calculations/MathConstants.java Normal file
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package com.baeldung.constantspatterns.calculations;
public final class MathConstants {
public static final double PI = 3.14159265359;
static final double GOLDEN_RATIO = 1.6180;
static final double GRAVITATIONAL_ACCELERATION = 9.8;
static final double EULERS_NUMBER = 2.7182818284590452353602874713527;
public enum Operation {
ADD, SUBTRACT, DIVIDE, MULTIPLY
}
private MathConstants() {
}
}

23
core-java-modules/core-java-lang-3/src/test/java/com/baeldung/constantspatterns/ConstantPatternUnitTest.java Normal file
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package com.baeldung.constantspatterns;
import static org.junit.jupiter.api.Assertions.assertEquals;
import org.junit.Test;
public class ConstantPatternUnitTest {
@Test
public void givenTwoNumbersAndAdd_whenCallingCalculatorOperatOneTwoNumbers_thenCorrectAnswerReturned() {
Calculator calculator = new Calculator();
double expected = 4;
double answer = calculator.operateOnTwoNumbers(2, 2, Calculator.Operation.ADD);
assertEquals(expected, answer);
}
@Test
public void givenTwoNumbersAndAdd_whenCallingGeometryCalculatorOperatOneTwoNumbers_thenCorrectAnswerReturned() {
GeometryCalculator calculator = new GeometryCalculator();
double expected = 4;
double answer = calculator.operateOnTwoNumbers(2, 2, GeometryCalculator.Operation.ADD);
assertEquals(expected, answer);
}
}