욱'S 노트

When Using It 다수의 처리자들을 연결하고 싶을때 Class Diagram Sample Code  public abstract class Handler { private Handler nextHandler; public abstract boolean handleRequest(); public final void setNext(Handler handler) { this.nextHandler = handler; } public final void process() { if (handleRequest() == false) { if ( nextHandler != null) { nextHandler.handleRequest(); } } } } public class ConcreteHandler exte..

When Using It 특정한 데이터 구조 가진 오브젝트를 방문하면서 처리를 하고 싶을때 Class Diagram Sample Code  public interface Element { public void accept(Visitor visitor); public void add(Element element); public List getChildren(); } public class ConcreteElement implements Element { private List children = new ArrayList(); @Override public void accept(Visitor visitor) { visitor.visitConcreteElement(this); } @Override publi..

When Using It 알고리즘 구현 부분을 교체 하고 싶을때 Class Diagram Sample Code  public interface Strategy { public void algorithmInterface(); } public class ConcreteStrategy implements Strategy { @Override public void algorithmInterface() { } } public class Context { private Strategy strategy; public Context(Strategy strategy) { this.strategy = strategy; } public void contextInteface() { strategy.algorithmInter..

When Using It 하위클래스에 구현을 위임하고 싶을때 Class Diagram Sample Code  public abstract class AbstractClass { public abstract void templateMethod1(); public abstract void templateMethod2(); public abstract void templateMethod3(); public void execute() { templateMethod1(); templateMethod2(); templateMethod3(); } } public class ConcreteClass extends AbstractClass { @Override public void templateMethod1() {}..

When Using It Heavy한 Job이 수행되는 클래스들을 미리 만들어 놓고 공유하고 싶을때 Class Diagram Sample Code  public interface Aggregate { } public interface Iterator { public Object next(); public boolean hasNext(); } public class ConcreteAggregate implements Aggregate { private Object[] items; public Iterator iterator() { return new ConcreteIterator(this); } public Object getItem(int index) { if ( index < items.length ..

When Using It Heavy한 Job이 수행되는 클래스들을 미리 만들어 놓고 공유하고 싶을때 Class Diagram Sample Code  public interface Flyweight { public void Operation(); } public class ConcreteFlyweight implements Flyweight { @Override public void Operation() { System.out.println("A"); } } public class FlyweightFactory { Map pool = new HashMap(); public FlyweightFactory() { pool.put("A",new ConcreteFlyweight()); } public Flywe..

When Using It Lazy Init 등 실제 사용이나 필요로하는 시점에 작업을 수행한다. Class Diagram Sample Code  public interface Subject { public void request(); } public class RealSubject implements Subject { @Override public void request() { System.out.println("실제수행"); } } public class Proxy implements Subject { private RealSubject realSubject; @Override public void request() { realSubject.request(); } } Caution 특별한 주의사항은 ..

When Using It 재귀적인 계층구조를 만들고 싶을때 Class Diagram Sample Code  public abstract class Component { public abstract void operation(); public abstract void add(Component component); public abstract void remove(Component component); } public class Leaf extends Component { @Override public void operation() { System.out.println(this.toString()); } @Override public void add(Component component) { throw ne..

When Using It 객체의 본질적인 정보와 실제 보여지는 기능을 분리하고 싶을때 Class Diagram Sample Code  public class Abstraction { private Implementor implementor; public Abstraction(Implementor implementor) { this.implementor = implementor; } public void operation() { implementor.operationImpl(); } } public class RefinedAbstraction extends Abstraction { public RefinedAbstraction(Implementor implementor) { super(implemento..

When Using It 객체의 본질적인 정보와 실제 보여지는 기능을 분리하고 싶을때 Class Diagram Sample Code  public abstract class Component { public abstract String operation(); } public class ConcreteComponent extends Component { private String name; public ConcreteComponent(String name) { this.name = name; } @Override public String operation() { return this.name; } } public abstract class Decorator extends Component { protec..