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Commitb532d70

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Added Builder Design pattern implementation in Java and its test
1 parent616d5cf commitb532d70

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packagesrc.main.java.com.designpatterns.builderpattern;
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/**
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* The Builder is a design pattern designed to provide a flexible solution to various object creation problems in
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* object-oriented programming. The intent of the Builder design pattern is to separate the construction of a complex
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* object from its representation.
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*
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* @see <a href="https://en.wikipedia.org/wiki/Builder_pattern">Builder Pattern</a>
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*/
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publicclassDesktop {
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privateStringCPU;
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privateStringRAM;
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privatebooleanisGraphicCardEnabled;
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privateStringoperatingSystem;
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privateintdiskSizeGB;
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privateStringgraphicCard;
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privateDesktop(DesktopBuilderbuilder) {
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this.CPU =builder.CPU;
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this.RAM =builder.RAM;
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this.isGraphicCardEnabled =builder.isGraphicCardEnabled;
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this.operatingSystem =builder.operatingSystem;
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this.diskSizeGB =builder.diskSizeGB;
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this.graphicCard =builder.graphicCard;
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}
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/**
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* Builder class for the above Desktop class. Constructs the Desktop by invoking the Desktop class constructor and
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* allows access to set optional fields in the Desktop class.
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*/
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publicstaticclassDesktopBuilder {
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privateStringCPU;
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privateStringRAM;
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privatebooleanisGraphicCardEnabled;
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privateStringoperatingSystem;
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privateintdiskSizeGB;
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privateStringgraphicCard;
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publicDesktopBuilder(StringCPU,StringRAM) {
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this.CPU =CPU;
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this.RAM =RAM;
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}
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publicDesktopBuildersetGraphicCardEnabled(booleangraphicCardEnabled) {
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this.isGraphicCardEnabled =graphicCardEnabled;
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returnthis;
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}
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publicDesktopBuildersetOperatingSystem(StringoperatingSystem) {
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this.operatingSystem =operatingSystem;
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returnthis;
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}
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publicDesktopBuildersetDiskSizeGB(intdiskSize) {
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this.diskSizeGB =diskSize;
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returnthis;
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}
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publicDesktopBuildersetGraphicCard(StringgraphicCard) {
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this.graphicCard =graphicCard;
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returnthis;
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}
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publicDesktopbuild() {
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returnnewDesktop(this);
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}
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}
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@Override
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publicStringtoString() {
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return"Desktop{" +
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"CPU='" +CPU +'\'' +
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", RAM='" +RAM +'\'' +
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", isGraphicCardEnabled=" +isGraphicCardEnabled +
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", operatingSystem='" +operatingSystem +'\'' +
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", diskSizeGB=" +diskSizeGB +
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", graphicCard='" +graphicCard +'\'' +
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'}';
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}
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}
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packagesrc.test.java.com.designpatterns.builderpattern;
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importorg.junit.Assert;
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importorg.junit.Test;
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importsrc.main.java.com.designpatterns.builderpattern.Desktop;
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publicclassDesktopBuilderTest {
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privatefinalStringconfigOne ="Desktop{CPU='Intel i7', RAM='Corsair Vengeance 3000', isGraphicCardEnabled=true" +
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", operatingSystem='Windows 10', diskSizeGB=16, graphicCard='NVIDIA GTX 1080'}";
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privatefinalStringconfigTwo ="Desktop{CPU='Intel i5', RAM='HyperX Fury v5', isGraphicCardEnabled=true, " +
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"operatingSystem='Red Hat Enterprise', diskSizeGB=16, graphicCard='NVIDIA RTX 2080'}";
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@Test
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publicvoidtestDesktopBuilder() {
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Desktopd1 =newDesktop.DesktopBuilder("Intel i7","Corsair Vengeance 3000")
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.setDiskSizeGB(16)
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.setGraphicCard("NVIDIA GTX 1080")
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.setGraphicCardEnabled(true)
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.setOperatingSystem("Windows 10")
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.build();
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Assert.assertEquals(d1.toString(),configOne);
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Desktopd2 =newDesktop.DesktopBuilder("Intel i5","HyperX Fury v5")
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.setDiskSizeGB(16)
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.setGraphicCard("NVIDIA RTX 2080")
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.setGraphicCardEnabled(true)
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.setOperatingSystem("Red Hat Enterprise")
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.build();
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Assert.assertEquals(d2.toString(),configTwo);
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}
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}

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