Builder Pattern

design-pattern/src/Builder/Blueprint.java

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+package Builder;
+
+public abstract class Blueprint {
+
+    abstract public Computer getComputer();
+    abstract public void setCpu();
+    abstract public void setRam();
+    abstract public void setStorage();
+
+}

design-pattern/src/Builder/Builder

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+Builder Pattern
+ - 복잡한 단계가 필요한 인스턴스 생성을 빌드 패턴을 통해서 구현
+ - 복잡한 단계를 거쳐야 생성되는 객체의 구현을 서브 클래스에게 넘겨주는 패턴

design-pattern/src/Builder/Computer.java

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+package Builder;
+
+public class Computer {
+
+    private String cpu;
+    private String ram;
+    private String storage;
+
+    @Override
+    public String toString() {
+        return cpu + ", " + ram + ", " + storage;
+    }
+
+    public Computer(String cpu, String ram, String storage) {
+        this.cpu = cpu;
+        this.ram = ram;
+        this.storage = storage;
+    }
+
+    public String getCpu() {
+        return cpu;
+    }
+
+    public void setCpu(String cpu) {
+        this.cpu = cpu;
+    }
+
+    public String getRam() {
+        return ram;
+    }
+
+    public void setRam(String ram) {
+        this.ram = ram;
+    }
+
+    public String getStorage() {
+        return storage;
+    }
+
+    public void setStorage(String storage) {
+        this.storage = storage;
+    }
+}

design-pattern/src/Builder/ComputerFactory.java

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+package Builder;
+
+public class ComputerFactory {
+
+    private Blueprint blueprint;
+
+    public void setBlueprint(Blueprint blueprint) {
+        this.blueprint = blueprint;
+    }
+
+    public Computer makeAndGet() {
+        blueprint.setRam();
+        blueprint.setCpu();
+        blueprint.setStorage();
+        return blueprint.getComputer();
+    }
+}
+ 

design-pattern/src/Builder/LgGramBlueprint.java

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+package Builder;
+
+public class LgGramBlueprint extends Blueprint {
+
+    private Computer computer;
+
+
+    public LgGramBlueprint() {
+        this.computer = new Computer("default", "default", "default");
+    }
+
+    @Override
+    public Computer getComputer() {
+        return computer;
+    }
+
+    @Override
+    public void setCpu() {
+        computer.setCpu("i7");
+    }
+
+    @Override
+    public void setRam() {
+        computer.setRam("8g");
+    }
+
+    @Override
+    public void setStorage() {
+        computer.setStorage("256g ssd");
+    }
+
+
+}

design-pattern/src/Builder/Main.java

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+package Builder;
+
+public class Main {
+
+    public static void main(String[] args) {
+
+        ComputerFactory factory = new ComputerFactory();
+        factory.setBlueprint(new LgGramBlueprint());
+        Computer computer = factory.makeAndGet();
+
+        System.out.println(computer.toString());
+    }
+}