1월 17일(화) - 5장(객체지향)

5장 - 객체지향 프로그래밍

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5-6 생성자

class Animal {
    String name;

    void setName(String name) {
        this.name = name;
    }
}

class Dog extends Animal {
    void sleep() {
        System.out.println(this.name + " zzz");
    }
}

class HouseDog extends Dog {
    HouseDog(String name){
        this.setName(name);
    }

    HouseDog(int type){
        if(type == 1){
            this.setName("yorkshire");
        } else if(type==2){
            this.setName("bulldog");
        }
    }
    void sleep() {
        System.out.println(this.name + " zzz in house");
    }

    void sleep(int hour) {
        System.out.println(this.name + " zzz in house for " + hour + " hours");
    }
}
public class Sample{
    public static void main(String[] args) {
        //HouseDog dog = new HouseDog("happy");
        //System.out.println(dog.name);
        HouseDog happy = new HouseDog("happy");
        HouseDog yorkshire = new HouseDog(1);
        System.out.println(happy.name);
        System.out.println(yorkshire.name);

    }
}

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5-7 인터페이스

interface Predator{
    String getFood();
}
class Animal{
    String name;

    void setName(String name){
        this.name = name;
    }
}

class Tiger extends Animal implements Predator{
    public String getFood(){
        return "apple";
    }
}

class Lion extends Animal implements Predator{
    public String getFood(){
        return "banana";
    }
}

class ZooKeeper{
    public void feed(Predator predator){
        System.out.println("feed "+predator.getFood());
    }
}
public class Sample{
    public static void main(String[] args) {
        ZooKeeper zooKeeper = new ZooKeeper();
        Tiger tiger = new Tiger();
        Lion lion = new Lion();
        zooKeeper.feed(tiger);
        zooKeeper.feed(lion);

    }
}

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5-8 다형성

interface Predator{
    String getFood();
}

interface Barkable{
    void bark();
}

interface BarkablePredator extends Predator, Barkable{

}
class Animal {
    String name;

    void setName(String name) {
        this.name = name;
    }
}
class Tiger extends Animal implements Predator, Barkable{
    public String getFood(){
        return "apple";
    }

    public void bark(){
        System.out.println("어흥");
    }
}

class Lion extends Animal implements BarkablePredator{
    public String getFood(){
        return "banana";
    }
    public void bark(){
        System.out.println("으르렁");
    }
}

class ZooKeeper {
    public void feed(Predator predator) {  // 호랑이가 오면 사과를 던져 준다.
        System.out.println("feed "+predator.getFood());
    }
}

class Bouncer{
    void barkAnimal(Barkable animal){
        animal.bark();
    }
}
public class Sample{
    public static void main(String[] args) {
        ZooKeeper zooKeeper = new ZooKeeper();
        Tiger tiger = new Tiger();
        Lion lion = new Lion();

       // zooKeeper.feed(tiger);  // feed apple 출력
        //zooKeeper.feed(lion);  // feed banana 출

        Bouncer bouncer = new Bouncer();
        bouncer.barkAnimal(tiger);
        bouncer.barkAnimal(lion);

    }
}

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5-9 추상클래스

abstract class Predator extends Animal{
    abstract  String getFood();
    void printFood(){
        System.out.printf("my food is %s\n", getFood());
    }
    static int LEG_COUNT = 4;
    static int speed(){
        return LEG_COUNT * 30;
    }
}

interface Barkable{
    void bark();
}

class Animal {
    String name;

    void setName(String name) {
        this.name = name;
    }
}
class Tiger extends Predator implements Barkable{
    public String getFood(){
        return "apple";
    }

    public void bark(){
        System.out.println("어흥");
    }
}

class Lion extends Predator implements Barkable{
    public String getFood(){
        return "banana";
    }
    public void bark(){
        System.out.println("으르렁");
    }
}

class ZooKeeper {
    public void feed(Predator predator) {  // 호랑이가 오면 사과를 던져 준다.
        System.out.println("feed "+predator.getFood());
    }
}

class Bouncer{
    void barkAnimal(Barkable animal){
        animal.bark();
    }
}
public class Sample{
    public static void main(String[] args) {
        ZooKeeper zooKeeper = new ZooKeeper();
        Tiger tiger = new Tiger();
        Lion lion = new Lion();

        // zooKeeper.feed(tiger);  // feed apple 출력
        //zooKeeper.feed(lion);  // feed banana 출

        Bouncer bouncer = new Bouncer();
        bouncer.barkAnimal(tiger);
        bouncer.barkAnimal(lion);

    }
}

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