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Commit43d4722

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Added Factory Design pattern implementation in Java and its test
1 parent4a3f871 commit43d4722

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6 files changed

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6 files changed

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packagesrc.main.java.com.designpatterns.factorypattern;
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publicclassPentagonimplementsPolygon {
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@Override
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publicStringgetType() {
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return"Pentagon";
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}
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@Override
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publicdoublearea(doubleside) {
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return3.847104 *side *side;
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}
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}
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packagesrc.main.java.com.designpatterns.factorypattern;
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publicinterfacePolygon {
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/**
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* Should be overriden to describe the type of each polygon
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*
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* @return a String value describing the name of the polygon
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*/
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StringgetType();
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/**
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* Calculates the area of the regular polygon
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*
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* @param side The length of the side of regular polygon
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* @return area of the polygon
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*/
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doublearea(doubleside);
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}
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packagesrc.main.java.com.designpatterns.factorypattern;
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/**
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* In class-based programming, the factory method pattern is a creational pattern that uses factory methods to deal
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* with the problem of creating objects without having to specify the exact class of the object that will be created.
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* This is done by creating objects by calling a factory method—either specified in an interface and implemented by
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* child classes, or implemented in a base class and optionally overridden by derived classes—rather than by calling
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* a constructor.
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*
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* @see <a href="https://en.wikipedia.org/wiki/Factory_method_pattern">Factory Pattern</a>
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*/
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publicclassPolygonFactory {
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/**
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* Factory pattern implementation for the Polygon Interface to return the correct regular polygon object
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* depending on the number of sides it has.
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*
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* @param numberOfSides in the polygon to initialize.
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* @return the object having the respective number of sides
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*/
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publicPolygongetPolygon(intnumberOfSides) {
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switch (numberOfSides) {
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case3:
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returnnewTriangle();
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case4:
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returnnewSquare();
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case5:
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returnnewPentagon();
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default:
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returnnull;
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}
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}
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}
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packagesrc.main.java.com.designpatterns.factorypattern;
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publicclassSquareimplementsPolygon {
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@Override
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publicStringgetType() {
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return"Square";
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}
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@Override
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publicdoublearea(doubleside) {
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returnside *side;
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}
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}
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packagesrc.main.java.com.designpatterns.factorypattern;
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publicclassTriangleimplementsPolygon {
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@Override
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publicStringgetType() {
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return"Triangle";
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}
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@Override
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publicdoublearea(doubleside) {
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return0.433013 *side *side;
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}
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}
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packagesrc.test.java.com.designpatterns.factorypattern;
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importorg.junit.Assert;
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importorg.junit.Test;
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importsrc.main.java.com.designpatterns.factorypattern.Polygon;
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importsrc.main.java.com.designpatterns.factorypattern.PolygonFactory;
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publicclassPolygonFactoryTest {
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@Test
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publicvoidtestPolygonFactory() {
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StringfailReason ="";
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PolygonFactorypolFactory =newPolygonFactory();
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//Test for triangle
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Polygontriangle =polFactory.getPolygon(3);
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if (!triangle.getType().equals("Triangle")) {
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failReason +="Polygon Factory failed for Triangle.";
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}
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if (triangle.area(4) !=6.928208) {
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failReason +="Triangle area is incorrect!";
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}
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//Test for square
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Polygonsquare =polFactory.getPolygon(4);
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if (!square.getType().equals("Square")) {
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failReason +="Polygon Factory failed for Square.";
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}
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if (square.area(5) !=25) {
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failReason +="Square area is incorrect!";
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}
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//Test for pentagon
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Polygonpentagon =polFactory.getPolygon(5);
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if (!pentagon.getType().equals("Pentagon")) {
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failReason +="Polygon Factory failed for Pentagon.";
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}
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if (pentagon.area(9) !=311.615424) {
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failReason +="Pentagon area is incorrect!";
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}
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Assert.assertEquals(failReason,failReason,"");
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}
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}

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