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Commit8e92cd2

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decorator pattern
1 parent68166ed commit8e92cd2

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8 files changed

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8 files changed

+138
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packagelearnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
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importlombok.Getter;
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publicabstractclassBeverage {
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@Getter
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Stringdescription ="Unknown beverage";
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publicabstractdoublecost();
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}
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packagelearnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
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publicabstractclassCondimentDecoratorextendsBeverage {
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publicabstractStringgetDescription();
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}
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packagelearnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
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/**Classes should be open for extension and closed for modification.
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*
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* Decorator pattern: attach additional responsibilities to an object dynamically.*/
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publicclassDecoratorPatternTestDrive {
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publicstaticvoidmain(String...args){
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System.out.println("Program started.");
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Beverageespresso =newEspresso();
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print(espresso);
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BeveragehouseBlend =newHouseBlend();
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houseBlend =newMocha(houseBlend);
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print(houseBlend);
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houseBlend =newSoy(houseBlend);
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print(houseBlend);
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houseBlend =newWhip(houseBlend);
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print(houseBlend);
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System.out.println("Program ended.");
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}
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/**
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* @param beverage
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*/
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protectedstaticvoidprint(Beveragebeverage) {
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System.out.println(beverage.getDescription() +" $" +beverage.cost());
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}
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}
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packagelearnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
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publicclassEspressoextendsBeverage {
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publicEspresso() {
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description ="Espresso";
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}
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@Override
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publicdoublecost() {
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return1.99;
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}
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}
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packagelearnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
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publicclassHouseBlendextendsBeverage {
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publicHouseBlend() {
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description ="House Blend Coffee";
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}
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@Override
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publicdoublecost() {
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return.89;
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}
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}
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packagelearnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
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publicclassMochaextendsCondimentDecorator {
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Beveragebeverage;
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publicMocha(Beveragebeverage){
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this.beverage =beverage;
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}
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@Override
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publicStringgetDescription() {
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returnbeverage.getDescription() +", Mocha";
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}
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@Override
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publicdoublecost() {
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return.20 +beverage.cost();
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}
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}
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packagelearnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
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publicclassSoyextendsCondimentDecorator {
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Beveragebeverage;
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publicSoy(Beveragebeverage){
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this.beverage =beverage;
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}
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@Override
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publicStringgetDescription() {
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returnbeverage.getDescription() +", Soy";
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}
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@Override
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publicdoublecost() {
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return.99 +beverage.cost();
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}
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}
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packagelearnHeadFirstDesignPatterns.chapter_3_decorator_pattern;
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publicclassWhipextendsCondimentDecorator {
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Beveragebeverage;
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publicWhip (Beveragebeverage) {
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this.beverage =beverage;
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}
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@Override
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publicStringgetDescription() {
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returnbeverage.getDescription() +", Whip";
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}
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@Override
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publicdoublecost() {
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return.77 +beverage.cost();
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}
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}

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