设计模式应用场景介绍&基础示例

package main.design23; /** * 构造者模式 */ public class BuilderPattern { public static void main(String[] args) { HouseBuilder concreteBuilder = new ConcreteHouseBuilder(); Director director1 = new Director(concreteBuilder); House concreteHouse = director1.constructHouse(); System.out.println("Concrete House: " + concreteHouse); HouseBuilder luxuryBuilder = new LuxuryHouseBuilder(); Director director2 = new Director(luxuryBuilder); House luxuryHouse = director2.constructHouse(); System.out.println("Luxury House: " + luxuryHouse); } static class House { private String foundation; private String structure; private String roof; private String interior; public void setFoundation(String foundation) { this.foundation = foundation; } public void setStructure(String structure) { this.structure = structure; } public void setRoof(String roof) { this.roof = roof; } public void setInterior(String interior) { this.interior = interior; } @Override public String toString() { return "House [foundation=" + foundation + ", structure=" + structure + ", roof=" + roof + ", interior=" + interior + "]"; } } static abstract class HouseBuilder { protected House house = new House(); public abstract void buildFoundation(); public abstract void buildStructure(); public abstract void buildRoof(); public abstract void buildInterior(); public House getHouse() { return house; } } static class ConcreteHouseBuilder extends HouseBuilder { @Override public void buildFoundation() { house.setFoundation("Standard Foundation"); } @Override public void buildStructure() { house.setStructure("Standard Structure"); } @Override public void buildRoof() { house.setRoof("Standard Roof"); } @Override public void buildInterior() { house.setInterior("Standard Interior"); } } static class LuxuryHouseBuilder extends HouseBuilder { @Override public void buildFoundation() { house.setFoundation("Strong Foundation"); } @Override public void buildStructure() { house.setStructure("Reinforced Structure"); } @Override public void buildRoof() { house.setRoof("Elegant Roof"); } @Override public void buildInterior() { house.setInterior("Luxury Interior"); } } static class Director { private HouseBuilder builder; public Director(HouseBuilder builder) { this.builder = builder; } public House constructHouse() { builder.buildFoundation(); builder.buildStructure(); builder.buildRoof(); builder.buildInterior(); return builder.getHouse(); } } }