학습내용
http://blog.chequer.io/archives/105
의 내용을 토대로 예제를 만들었습니다.
A-01. 사과엔티티
package com.donzbox; public class Apple {
private String color; private int weight; public String getColor() { return color; } public void setColor(String color) { this.color = color; } public int getWeight() { return weight; } public void setWeight(int weight) { this.weight = weight; } } |
A-02. 오렌지엔티티
package com.donzbox; public class Orange { private String color; private int weight; public String getColor() { return color; } public void setColor(String color) { this.color = color; } public int getWeight() { return weight; } public void setWeight(int weight) { this.weight = weight; } } |
A-03. 사과와 오렌지 엔티티의 데이터를 필터조건에 의해 추출
package com.donzbox; import java.util.ArrayList; import java.util.List; import java.util.ListIterator; public class FruitsFactory { public static void main(String[] args) { FruitsFactory appleFactory = new FruitsFactory(); appleFactory.TestApp1(); } public List<Apple> AppleData() { List<Apple> appleList = new ArrayList<>(); Apple apple = new Apple(); apple.setColor("red"); apple.setWeight(40); appleList.add(apple); apple = new Apple(); apple.setColor("green"); apple.setWeight(60); appleList.add(apple); return appleList; } public List<Orange> OrangeData() { List<Orange> orangeList = new ArrayList<>(); Orange orange = new Orange(); orange.setColor("yellow"); orange.setWeight(40); orangeList.add(orange); orange = new Orange(); orange.setColor("blue"); orange.setWeight(60); orangeList.add(orange); return orangeList; } public List<Apple> filterGreenApples(List<Apple> inventory, String color, int weight, boolean flag) { List result = new ArrayList<>(); for (Apple apple : inventory) { if ((flag && apple.getColor().equals(color)) || (!flag && apple.getWeight() > weight)) { result.add(apple); } } return result; } public void TestApp1() { List<Apple> result = filterGreenApples(AppleData(), "red", 50, true); ListIterator<Apple> litr = result.listIterator(); while (litr.hasNext()) { Apple apple = litr.next(); System.out.println(apple.getColor() + " / " + apple.getWeight()); } } } |
B-01. 사과 추상화
package com.donzbox; import java.util.ArrayList; import java.util.List; import java.util.ListIterator; public class FruitsFactory { public static void main(String[] args) { FruitsFactory appleFactory = new FruitsFactory(); appleFactory.TestApp2(); } public List<Apple> AppleData() { List<Apple> appleList = new ArrayList<>(); Apple apple = new Apple(); apple.setColor("red"); apple.setWeight(40); appleList.add(apple); apple = new Apple(); apple.setColor("green"); apple.setWeight(60); appleList.add(apple); return appleList; } public List<Orange> OrangeData() { List<Orange> orangeList = new ArrayList<>(); Orange orange = new Orange(); orange.setColor("yellow"); orange.setWeight(40); orangeList.add(orange); orange = new Orange(); orange.setColor("blue"); orange.setWeight(60); orangeList.add(orange); return orangeList; } public interface ApplePredicate { public boolean test(Apple a); } public class AppleWeightPredicate implements ApplePredicate { public boolean test(Apple apple) { return apple.getWeight() > 150; } } public class AppleColorPredicate implements ApplePredicate { public boolean test(Apple apple) { return "green".equals(apple.getColor()); } } public class AppleRedAndHeavyPredicate implements ApplePredicate { public boolean test(Apple apple) { return "red".equals(apple.getColor()) && apple.getWeight() > 150; } } public List filterApples(List<Apple> inventory, ApplePredicate p) { List result = new ArrayList<>(); for (Apple apple : inventory) { if (p.test(apple)) { result.add(apple); } } return result; } public void TestApp2() { List result = filterApples(AppleData(), new AppleColorPredicate()); result = filterApples(AppleData(), (Apple apple) -> "red".equals(apple.getColor())); ListIterator<Apple> litr = result.listIterator(); while (litr.hasNext()) { Apple apple = litr.next(); System.out.println(apple.getColor() + " / " + apple.getWeight()); } } } |
C-01. 사과 또는 오렌지 뭐든지간에 드오는대로 처리되는 추상화
과일 구현체에 의한 사과
package com.donzbox; public class Apple implements Flute {
private String color; private int weight; public String getColor() { return color; } public void setColor(String color) { this.color = color; } public int getWeight() { return weight; } public void setWeight(int weight) { this.weight = weight; } } |
과일 구현체에 의한 오렌지
package com.donzbox; public class Orange implements Flute { private String color; private int weight; public String getColor() { return color; } public void setColor(String color) { this.color = color; } public int getWeight() { return weight; } public void setWeight(int weight) { this.weight = weight; } } |
과일 인터페이스
package com.donzbox; public interface Fruits { public String getColor(); public int getWeight(); } |
T클레스에 의한 필터처리
package com.donzbox; import java.util.ArrayList; import java.util.List; import java.util.ListIterator; public class FruitsFactory { public static void main(String[] args) { FruitsFactory appleFactory = new FruitsFactory(); appleFactory.TestApp3(); } public List<Apple> AppleData() { List<Apple> appleList = new ArrayList<>(); Apple apple = new Apple(); apple.setColor("red"); apple.setWeight(40); appleList.add(apple); apple = new Apple(); apple.setColor("green"); apple.setWeight(60); appleList.add(apple); return appleList; } public List<Orange> OrangeData() { List<Orange> orangeList = new ArrayList<>(); Orange orange = new Orange(); orange.setColor("yellow"); orange.setWeight(40); orangeList.add(orange); orange = new Orange(); orange.setColor("blue"); orange.setWeight(60); orangeList.add(orange); return orangeList; } public interface Predicate<T> { boolean test(T t); } public class WeightPredicate<T extends Fruits> implements Predicate<T> { public boolean test(T t) { return t.getWeight() > 150; } } public class ColorPredicate<T extends Fruits> implements Predicate<T> { public boolean test(T t) { return "green".equals(t.getColor()); } } public class RedAndHeavyPredicate<T extends Fruits> implements Predicate<T> { public boolean test(T t) { return "red".equals(t.getColor()) && t.getWeight() > 150; } } public <X> List<X> filter(List<X> list, Predicate<X> p) { List<X> result = new ArrayList<>(); for (X e : list) { if (p.test(e)) { result.add(e); } } return result; } public void TestApp3() { List<Apple> resultApple = filter(AppleData(), new ColorPredicate<>()); List<Orange> resultOrange = filter(OrangeData(), new ColorPredicate<>()); ListIterator<Apple> litrApple = resultApple.listIterator(); while (litrApple.hasNext()) { Apple apple = litrApple.next(); System.out.println(apple.getColor() + " / " + apple.getWeight()); }
ListIterator<Orange> litrOrange = resultOrange.listIterator(); while (litrOrange.hasNext()) { Orange orange = litrOrange.next(); System.out.println(orange.getColor() + " / " + orange.getWeight()); } // List redApples = filter(AppleData(), (Apple apple) -> "red".equals(apple.getColor())); // List heavyOranges = filter(OrangeData(), (Orange orange) -> orange.getWeight() > 500); } } |
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