7장 상속 연습 문제 및 LAB 문제 -1

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1. 동물 예제

package 동물예제;
public class Animal {
	private double weight;
	private String picture;
	void eat(){
		System.out.println("eat()가 호출되었음");
	}
	void sleep(){
		System.out.println("sleep()가 호출되었음");
	}

}

package 동물예제;
public class Lion extends Animal{
	private int legs=4;
	void roar() {
		System.out.println("roar()가 호출되었음");
	}
}

package 동물예제;
public class Eagle extends Animal{
	private int wings=2;
	void fly() {
		System.out.println("fly()가 호출되었음");
	}
}

package 동물예제;

public class AnimalTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Lion mylion=new Lion();
		Eagle myeagle=new Eagle();
		mylion.eat();
		mylion.sleep();
		mylion.roar();
		
		myeagle.eat();
		myeagle.sleep();
		myeagle.fly();
	}

}

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2. 도형 예제

package 도형예제;

public class Shape {
	public int x,y;
	
	void print() {
		System.out.println("x좌표 : "+x+"  y좌표: "+y);
	}
}

package 도형예제;

public class Rectangle extends Shape{
	private int width, height;
	double area() {
		return (double)width*height;
	}
	void draw() {
		System.out.printf("(%d,%d)위치에 가로: %d 세로: %d\n", x, y, width, height);
	}
	
	public static void main(String[] args) {
		Rectangle r1=new Rectangle();
		Rectangle r2=new Rectangle();
		
		r1.x=5;
		r1.y=3;
		r1.width=10;
		r1.height=20;
		r2.x=8;
		r2.y=9;
		r2.width=10;
		r2.height=20;
		
		r1.print();
		r1.draw();
		r2.print();
		r2.draw();
	}
}

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3. 직원과 매니저 클래스 실습예제

package 직원과매니저클래스작성;

public class Employee {
	public String name;
	public String address;
	protected int salary;
	private int rrn;
	
	public Employee(String name,String address,int salary,int rrn) {
		this.name=name;
		this.address=address;
		this.salary=salary;
		this.rrn=rrn;
	}
	
	@Override
	public String toString() {
		return "Employee [name="+name+", address="+address+", salary="+salary+", rrn="+rrn+"]";
	} //rrn을 출력해야하기 때문에 이 클래스에 위치해야함, 아니면 이 클래스에 접근자를 추가하던가 아마...?
	
	
	
}

package 직원과매니저클래스작성;

public class Manager extends Employee{
	private int bonus;
	
	public Manager(String name,String address,int salary,int rrn, int bonus) {
		super(name, address, salary, rrn);
		this.bonus=bonus;
	}
	
	public void test() {
		System.out.println("name = "+name);
		System.out.println("address = "+address);
		System.out.println("salary = "+salary);
	}
}

package 직원과매니저클래스작성;

public class ManagerTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Employee employee=new Employee("Tom", "Seoul", 1000000, 123456);
		Manager manager=new Manager("Tom", "Seoul", 1000000, 123456, 50000);
		
		String s=employee.toString();
		System.out.println(s);
		manager.test();
	}

}

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4. 은행 클래스 작성하기

package 은행다양한이자율;

public class Bank {
	double getInterestRate() {
		return 0.0;
		}
}

class BadBank extends Bank{
	double getInterestRate() {
		return 10.0;
		}
}

class NormalBank extends Bank{
	double getInterestRate() {
		return 5.0;
		}
}

class GoodBank extends Bank{
	double getInterestRate() {
		return 3.0;
		}
}

class BankTest{
	public static void main(String[] args) {
		BadBank bb=new BadBank();
		NormalBank nb=new NormalBank();
		GoodBank gb=new GoodBank();
		
		System.out.println("BadBank의 이자율: "+ bb.getInterestRate());
		System.out.println("NormalBank의 이자율: "+ nb.getInterestRate());
		System.out.println("GoodBank의 이자율: "+ gb.getInterestRate());
	}
}

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5. 복잡한 상속 구조

package 복잡한상속;

public class Shape {
	private int x;
	private int y;
	
	public Shape(int x, int y) {
		this.x=x;
		this.y=y;
		System.out.println("Shape()");
	}
}

package 복잡한상속;

public class Rectangle extends Shape {
	private int width;
	private int height;
	
	public Rectangle(int x, int y, int width, int height) {
		super(x,y);
		System.out.println("Rectangle()");
		this.width=width;
		this.height=height;
	}
	
	double area() {
		return width*height;
	}
	
}

package 복잡한상속;

public class Colored extends Rectangle{
	String color;
	public Colored(int x, int y, int width, int height, String color) {
		super(x,y,width, height);
		System.out.println("Colored()");
		this.color=color;
	}
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Colored thing= new Colored(10,10,20,20,"red");
	}

}

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6. 동적 메소드 호출

package 동적메소드;

public class Animal {
	void sound() {
		System.out.println("Animal 클래스의 sound()");
	}
}

package 동적메소드;

public class Cat extends Animal {
	void sound() {
		System.out.println("냐옹");
	}
}

package 동적메소드;

public class Dog extends Animal {
	void sound() {
		System.out.println("멈머");
	}
}

package 동적메소드;

public class SoundTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Animal animal=new Animal();
		Dog dog=new Dog();
		Cat cat=new Cat();
		
		Animal s;
		s=animal;
		s.sound();
		s=dog;
		s.sound();
		s=cat;
		s.sound();
		
	}

}

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7. TV 클래스 상속 예제

package TV클래스;

class TV{
	   private int size;
	   public TV(int size) { this.size = size; }
	   protected int getSize() { return size; }
	}

package TV클래스;

class ColorTV extends TV {
	   private int color;
	   ColorTV(int size, int color) {
	      super(size);
	      this.color = color;
	   }
	   public void printProperty() {
	      System.out.print(getSize()+"인치 "+color+"컬러");
	   }
	

}

package TV클래스;

class IPTV extends ColorTV {
		   String IP;
		   IPTV(String IP, int size, int color) {
		      super(size, color);
		      this.IP = IP;
		   }
		   public void printProperty() {
		      System.out.print("나의 IPTV는 "+IP+" 주소의 ");
		      super.printProperty();
		   }
		   
		}

package TV클래스;

public class TVTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ColorTV myTV = new ColorTV(32, 1024);
		myTV.printProperty();
		
		 IPTV iptv = new IPTV("192.1.1.2", 32, 2048); 
		 iptv.printProperty();
	}
}

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8. point 이동 클래스 상속 예제

package Point;

public class Point {
	private int x,y;
	public Point(int x, int y) {
		this.x=x;
		this.y=y;
	}
	public int getX() {
		return x;
	}
	public int getY() {
		return y;
	}
	protected void move(int x, int y) {
		this.x=x;
		this.y=y;
	}
}

package Point;

public class Point {
	private int x,y;
	public Point(int x, int y) {
		this.x=x;
		this.y=y;
	}
	public int getX() {
		return x;
	}
	public int getY() {
		return y;
	}
	protected void move(int x, int y) {
		this.x=x;
		this.y=y;
	}
}

package Point;

public class PositivePoint extends Point {
	 public PositivePoint() {
	      super(0, 0);
	   }
	   public PositivePoint(int x, int y) {
	      super(x,y);
	      if(x<0 || y<0) {
	         super.move(0,0);
	      }
	   }
	   protected void move(int x, int y) {
	      if(x>0 && y>0) {
	         super.move(x, y);
	      }
	   }
	   public String toString() {
	      String s = "("+getX()+","+getY()+")의 점";
	      return s;
	   }
	
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		PositivePoint p = new PositivePoint();
		p.move(10, 10);
		System.out.println(p.toString()+"입니다.");
		p.move(-5,5); // 객체 p는 음수 공간으로 이동되지 않음
		System.out.println(p.toString()+"입니다.");
		PositivePoint p2 = new PositivePoint(-10, -10);
		System.out.println(p2.toString()+"입니다.");
	}

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8. ColorPoint 상속 예제

package Point;

public class ColorPoint extends Point{
	private String color;
	
	public ColorPoint(int x, int y, String color) {
		super(x,y);
		this.color=color;		
	}
	public void setXY(int x, int y) {
		move(x,y);
	}
	public void setColor(String color) {
		this.color=color;
	}
	public String toString(){
		String s= this.color+"색의 ("+getX()+","+getY()+")의 점";
		return s;
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ColorPoint cp=new ColorPoint(5,5,"Yellow");
		cp.setXY(10,20);
		cp.setColor("RED");
		String str=cp.toString();
		System.out.println(str+"입니다.");
	}

}