명품 자바 프로그래밍

Wooney98·2022년 11월 17일

PlayData_BackEnd

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실습1

package org.comstudy.day08;

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

class colorTV extends tv{
    private int Color;
    public colorTV(int size, int Color) {
        super(size);
        this.Color = Color;
    }
    public void printProperty() {
        System.out.println(super.getSize()+"인치 " + Color+"컬러");
    }
}
public class ch5_pr1 {
    public static void main(String [] args) {
        colorTV myTV = new colorTV(32, 1024);
        myTV.printProperty();
    }
}

실습2

package org.comstudy.day08;

class TV {
    private int size;
    public TV() {}
    public TV(int size) { this.size = size; }
    protected int getSize() { return size; }
}
class ColorTV extends TV {
    private int color;
    public ColorTV(int size, int color) {
        // TODO Auto-generated constructor stub
        super(size);
        this.color = color;
    }
    void printProperty() {
        System.out.print(getSize()+"인치 "+ color+"컬러");
    }
}
class IPTV extends ColorTV {
    String ip;
    public IPTV(String ip, int size, int color) {
        // TODO Auto-generated constructor stub
        super(size,color);
        this.ip = ip;
    }
    void printProperty() {
        System.out.print("나의 IPTV는 "+ip+" 주소의 ");
        super.printProperty();
    }
}

public class ch5_pr2 {

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

}

실습3

package org.comstudy.day08;

import java.util.Scanner;

abstract class Converter{
    protected abstract double convert(double src);
    protected abstract String getSrcString();
    protected abstract String getDestString();
    protected double ratio;

    public void run() {
        Scanner sc = new Scanner(System.in);
        System.out.println(getSrcString() + "을 " + getDestString() + "로 바꿉니다.");
        System.out.print(getSrcString() + "을 입력하세요>> ");
        double val = sc.nextDouble();
        double res = convert(val);
        System.out.println("변환 결과: " + res + getDestString() + "입니다");
        sc.close();
    }
}
class Won2Dollar extends Converter{
    public Won2Dollar(double ratio) {
        // TODO Auto-generated constructor stub
        this.ratio = ratio;
    }

    @Override
    protected double convert(double src) {
        // TODO Auto-generated method stub
        return src/ratio;
    }

    @Override
    protected String getSrcString() {
        // TODO Auto-generated method stub
        return "원";
    }

    @Override
    protected String getDestString() {
        // TODO Auto-generated method stub
        return "달러";
    }

}

public class ch5_pr3 {
    public static void main(String[] args) {
        Won2Dollar toDollar = new Won2Dollar(1200); // 1달러는 1200원
        toDollar.run();
    }
}

실습4

package org.comstudy.day08;

import java.util.Scanner;

abstract class ConVerter{
    protected abstract double convert(double src);
    protected abstract String getSrcString();
    protected abstract String getDestString();
    protected double ratio;

    public void run() {
        Scanner sc = new Scanner(System.in);
        System.out.println(getSrcString() + "을 " + getDestString() + "로 바꿉니다.");
        System.out.print(getSrcString() + "을 입력하세요>> ");
        double val = sc.nextDouble();
        double res = convert(val);
        System.out.println("변환 결과: " + res + getDestString() + "입니다");
        sc.close();
    }
}
class Km2Mile extends ConVerter{
    public Km2Mile(double ratio) {
        // TODO Auto-generated constructor stub
        this.ratio = ratio;
    }

    @Override
    protected double convert(double src) {
        // TODO Auto-generated method stub
        return src/ratio;
    }

    @Override
    protected String getSrcString() {
        // TODO Auto-generated method stub
        return "km";
    }

    @Override
    protected String getDestString() {
        // TODO Auto-generated method stub
        return "mile";
    }

}

public class ch5_pr4 {
    public static void main(String[] args) {
        Km2Mile toMile = new Km2Mile(1.6); 
        toMile.run();
    }
}

실습5

package org.comstudy.day08;

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; }
}

class ColorPoint extends Point {
    private String color;
    public ColorPoint(int x, int y, String color) {
        // TODO Auto-generated constructor stub
        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 str = color+"색의 ("+getX()+","+getY()+")의 점" ;
        return str;
    }
}

public class ch5_pr5 {

    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.");
    }

}

실습6

package org.comstudy.day08;

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; }
}
class Colorpoint extends point {
    private String color;
    public Colorpoint() {
        super(0,0);
        this.color = "BLACK";
    }
    public Colorpoint(int x, int y) {
        // TODO Auto-generated constructor stub
        super(x,y);
        this.color = "BLACK";
    }
    public void setXY(int x, int y) {
        move(x,y);
    }
    public void setColor(String color) {
        this.color = color;
    }
    public String toStr(){
        String str = color+ "색의 ("+getX()+","+getY()+")의 점" ;
        return str;
    }
}
public class ch5_pr6 {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Colorpoint zeroPoint = new Colorpoint();
        System.out.println(zeroPoint.toStr()+ "입니다.");

        Colorpoint cp = new Colorpoint(10,10);
        cp.setXY(5,5);
        cp.setColor("RED");
        System.out.println(cp.toStr()+ "입니다.");
    }
}

실습7

package org.comstudy.day08;

class Point3D extends Point {
    int z;
    public Point3D(int x, int y, int z) {
        super(x, y);
        this.z = z;
    }
    public void moveUp(){
        z++;
    }
    public void moveDown() {
        z--;
    }
    public void move(int x, int y, int z){
        move(x,y);
        this.z = z;
    }
    public String toString(){
        return "(" + getX() + ", " + getY()  + ", " + z + ")의 점";
    }
}

public class ch5_pr7 {
    public static void main(String[] args) {
        Point3D p = new Point3D(1,2,3); // 1,2,3은 각각 x,y,z축의 값.
        System.out.println(p.toString() + "입니다.");

        p.moveUp(); // z축으로 위쪽 이동.
        System.out.println(p.toString() + "입니다.");
        p.moveDown(); // z축으로 아래쪽 이동
        p.move(10,10); // x,y축으로 이동
        System.out.println(p.toString() + "입니다.");

        p.move(100,200,300); // x, y, z축으로 ㅇ동
        System.out.println(p.toString() + "입니다.");
    }
}

실습8

package org.comstudy.day08;

class PositivePoint extends Point{

    public PositivePoint() {
        super(0, 0);
    }
    public PositivePoint(int x, int y){
        super(x,y);
        if (getX()<0 || getY()<0){
            move(0,0);
        }
    }
    public void move(int x, int y){
        if (x<0 || y<0){
            return;
        }else {super.move(x,y);}
    }
    public String toString(){
        return "(" + getX() + ", " + getY() + ")의 점";
    }
}

public class ch5_pr8 {
    public static void main(String[] args) {
        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.");
    }
}

실습9

package org.comstudy21.day08;

import java.util.Scanner;

interface Stack {
	int length();
	int capacity();
	String pop();
	boolean push(String val);
}

class StringStack implements Stack{
	private int num; 
	private int set; 
	private String[] stack; 
	
	public StringStack(int num) {
		this.num = num;
		this.set = 0; // 스택의 크기
		stack = new String[num];
	}
	public int length() {
		return set;
	}
	public int capacity() {
		return stack.length;
	}
	public String pop() {
		// 예외처리
		if(set-1<0)  
			return null;
		set--;
		String s = stack[set];
		return s;
	}
	public boolean push(String val) {
		if(set<num) {
			stack[set] = val;
			set++; 
			return true;
		}else
			return false;
	}
}

public class ch5_pr9 {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.print("총 스택 저장 공간의 크기 입력 >> ");
		int a = sc.nextInt();
		StringStack ss = new StringStack(a);
			
		while(true) {
			System.out.print("문자열 입력 >> ");
			String val = sc.next();
			if(val.equals("그만"))
				break;
			if(!ss.push(val)) {
				System.out.println("스택이 꽉차서 푸시 불가!");
			}
		}
		System.out.print("스택에 저장된 모든 문자열 팝 : ");
		for(int i = 0; i<ss.capacity(); i++) {
			String s = ss.pop();
			System.out.print(s+" ");
		}
	}
}

실습10

package org.comstudy21.day08;

abstract class PairMap{
	protected String keyArray [];
	protected String valueArray [];
	abstract String get(String key);
	abstract void put(String key, String value);
	abstract String delete(String key);
	abstract int length();
}

class Dictionary extends PairMap{
	public Dictionary(int i) {
		keyArray = new String[i];
		valueArray = new String[i];
	}
	
	@Override
	String get(String key) {
		for(int i=0; i<keyArray.length; i++) {
			if(keyArray[i] == key) {
				return valueArray[i];
			}
		}
		return null;
	}

	@Override
	void put(String key, String value) {
		for(int i=0; i<keyArray.length; i++) {
			if(keyArray[i] == key) {
				valueArray[i] = value;
				break;
			}
			else if(keyArray[i] == null) {
				keyArray[i] = key;
				valueArray[i] = value;
				break;
			}
		}
	}

	@Override
	String delete(String key) {
		String result = "";
		for(int i=0; i<keyArray.length; i++) {
			if(keyArray[i] == key) {
				keyArray[i] = null;
				result = valueArray[i];
				valueArray[i] = null;
				return result;
			}
		}
		return null;
	}

	@Override
	int length() {
		int count = 0;
		for(int i=0; i<keyArray.length; i++) {
			if(keyArray[i] != null){
				System.out.println(keyArray[i]);
				count++;
			}
		}
		return count;
	}
}

public class ch5_pr10 {
	public static void main(String[] args) {
		Dictionary dic = new Dictionary(10);
		dic.put("황기태", "자바");
		dic.put("이재문", "파이썬");
		dic.put("이재문", "C++");
		System.out.println("이재문의 값은 " + dic.get("이재문"));
		System.out.println("황기태의 값은 " + dic.get("황기태"));
		
		dic.delete("황기태");
		System.out.println("황기태의 값은 " + dic.get("황기태"));
	}
}

실습11

package org.comstudy.day09;

import java.util.Scanner;

abstract class Calc{
	protected int a;
	protected int b;
	public void setValue(int a, int b) {
		this.a = a;
		this.b = b;
	}
	public abstract int calculate();
}

class Add extends Calc{
	@Override
	public int calculate() {
		return a + b;
	}
}

class SUB extends Calc{
	@Override
	public int calculate() {
		return a - b;
	}
}

class Mul extends Calc{
	@Override
	public int calculate() {
		return a * b;
	}
}

class Div extends Calc{
	@Override
	public int calculate() {
		try {
			return a / b;
		}catch(Exception e){
			if(a==0 || b==0) {
				System.out.println("0으로 나눌수 없다.");
			}
			return 0;
		}
	}
}


public class ch5_pr11 {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.print("두 정수와 연산자를 입력하시오>> ");
		int x = sc.nextInt();
		int y = sc.nextInt();
		char operator = sc.next().charAt(0);
		
		Calc calc;
		switch(operator) {
		case '+': 
			calc = new Add();
			calc.setValue(x, y);
			System.out.println(calc.calculate());
			break;
		case '-': 
			calc = new SUB();
			calc.setValue(x, y);
			System.out.println(calc.calculate());
			break;
		case '*':
			calc = new Mul();
			calc.setValue(x, y);
			System.out.println(calc.calculate());
			break;
		case '/': 
			calc = new Div();
			calc.setValue(x, y);
			System.out.println(calc.calculate());
			break;
		}
	}
}

실습12

package org.comstudy.day09;

import java.util.Scanner;

abstract class Shape {
	private Shape next;
	public Shape() {next = null; }
	public void setNext(Shape obj) { next = obj; }  // 링크 연결
	public Shape getNext() { return next; }
	public abstract void draw();
}

class Line extends Shape{
	@Override
	public void draw() {
		System.out.println("Line");
	}
}
class Rect extends Shape{
	@Override
	public void draw() {
		System.out.println("Rect");
	}
}
class Circle extends Shape{
	@Override
	public void draw() {
		System.out.println("Circle");
	}
}

class Editor{
	private Shape head; // LinkedList의 첫번쨰 노드
	private Shape tail;    // LinkedList의 마지막 노드
	
	public Editor(){
		this.head = null;  
		this.tail = null;     
	}
	public void Insert(int p) {
		Shape tmp = null;
		switch(p) {
		case 1: p= new Line(); break;
		case 2: p= new Rect(); break;
		case 3: p= new Circle(); break;
		default :
			System.out.println("Error!");
			break;
		}
		if(head==null) { // head가 아무것도 안가리키면,
			head = p; // head랑 tail이 새로운 노드를 가리킴,
			tail = p;
		}else {
			tail.setNext(p); // 끝노드에 새로운 노드를 연결
			tail = p;   // 새로운 노드를 가리킴
		}
	}
	public void Delete(int del) {
		Shape current_node = head; // 현재 노드
		Shape p= head ;
		
		if(head == null) {
			System.out.println("삭제할 수 없습니다.");
		}
		if(del == 1) {
			if(head==tail) {
				head = null;
				tail = null;
				return;
			} else {  // 노드가 여러개
				head = head.getNext();
				return;
			}
		}
		else {
			int i;
			for(i = 1; i<del; i++) {
				p = current_node; // 이전노드로 바꿈
				current_node = current_node.getNext(); // 다음노드 이동
				if(current_node == null) {
					System.out.println("삭제할 수 없습니다.");
					return;
				}
			}
			if(current_node == tail ) {// 끝 노드
				tail = p;
				tail.setNext(null);
			}else {
				p.setNext(current_node.getNext()); // 이전노드가 다음노드를 가리킴
			}
		}
		if(del < 1) {
			System.out.println("Error!!");
		}
	}
	
	 public void printAll() {
	      Shape obj = head;
	      while(obj != null){
	          obj.draw();
	          obj = obj.getNext();
	       }
	  }
}
public class ch5_pr12 {
	Scanner sc = new Scanner(System.in);
	Editor ed = new Editor();
	public ch5_pr12() {
		System.out.println("그래픽 에디터 beauty을 실행합니다.");
	}
	
	public void run() {
        while(true) {
            System.out.print("삽입(1), 삭제(2), 모두 보기(3), 종료(4)>>");
            int num = sc.nextInt();
 
            switch(num){
            case 1:
                System.out.print("Line(1), Rect(2), Circle(3)>>");
                int insert = sc.nextInt();
                ed.Insert(insert);
                break;
            case 2:
                System.out.print("삭제할 도형의 위치>>");
                int del = sc.nextInt();
                ed.Delete(del);
                break;
            case 3:
            	ed.printAll();
                break;
            case 4:
                System.out.println("beauty을 종료합니다.");
                return;
            default:
                System.out.println("잘못 된 값을 입력하셨습니다.");
                break;
            }
        }
    }
	public static void main(String[] args) {
		ch5_pr12 a = new ch5_pr12();
		a.run();
	}
}

실습13

package org.comstudy.day09;

interface Shape2{
	final double PI = 3.14;
	void draw();
	double getArea();
	default public void redraw() {
		System.out.print("--- 다시 그립니다.  ");
		draw();
	}
}

class Circle2 implements Shape2{
	private int i;
	public Circle2(int i) { this.i = i; }

	@Override
	public void draw() {
		// TODO Auto-generated method stub
		System.out.println( "반지름이 " + i + "인 원입니다.");
	}

	@Override
	public double getArea() {
		// TODO Auto-generated method stub
		return PI * Math.pow(i, 2);
	}
	
}

public class ch5_pr13 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Shape2 donut = new Circle2(10);
		donut.redraw();
		System.out.println("면적은 " + donut.getArea());
	}

}

실습14

package org.comstudy.day09;

class Oval implements Shape2{
	int x,y;
	public Oval(int x, int y) {
		// TODO Auto-generated constructor stub
		this.x = x; this.y = y;
	}

	@Override
	public void draw() {
		System.out.printf("%d x %d에 내접하는 타원입니다. \n",x,y);
	}

	@Override
	public double getArea() {
		return PI * x * y;
	}
	
}

class Rect2 implements Shape2{
	int x,y;
	public Rect2(int x, int y) {
		// TODO Auto-generated constructor stub
		this.x = x; this.y = y;
	}

	@Override
	public void draw() {
		System.out.printf("%d x %d크기의 사각형 입니다. \n",x,y);
	}

	@Override
	public double getArea() {
		return x * y;
	}
	
}

public class ch5_pr14 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Shape2 [] list = new Shape2[3];
		list[0] = new Circle2(10);
		list[1] = new Oval(20,30);
		list[2] = new Rect2(10,40);
		
		for(int i=0; i<list.length; i++) list[i].redraw();
		for(int i=0; i<list.length; i++) System.out.println("면적은 " + list[i].getArea());
	}

}

Wooney98

👨Education Computer Engineering 🎓Expected Graduation: February 2023 📞Contact info thstjddn77@gmail.com

명품 자바 프로그래밍

PlayData_BackEnd

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