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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..