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명품 JAVA 5장 실습문제 본문

JAVA/명품 JAVA 실습문제

명품 JAVA 5장 실습문제

ttttki913 2023. 6. 6. 12:41

 

prac 5_1

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(getSize() + "인치 " + color + "컬러");
	}
}

public class Practice {
	public static void main(String[] args) {
		ColorTV myTV = new ColorTV(32, 1024);
		myTV.printProperty();
	}
}
prac 5_2

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(getSize() + "인치 " + color + "컬러");
	}
}

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

public class Practice {
	public static void main(String[] args) {
		IPTV iptv = new IPTV("192.1.1.2", 32, 2048);
		
		iptv.printProperty();
	}
}

 

prac 5_3
import java.util.Scanner;

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

	public void run() {
		Scanner scanner = new Scanner(System.in);
		System.out.println(getSrcString() + "을 " +getDestString() + "로 바꿉니다.");
		System.out.print(getSrcString() + "을 입력하세요>> ");
		double val = scanner.nextDouble();
		double res = convert(val);
		System.out.println("변환 결과: " + res + getDestString() + "입니다.");
		scanner.close();
	}
}

class Won2Dollar extends Converter {
	public Won2Dollar (double ratio) {
		this.ratio = ratio;
	}
	protected double convert(double src) {
		return src/ratio;
	}
	protected String getSrcString() {
		return "원";
	}
	protected String getDestString() {
		return "달러";
	}
}

public class Practice {
	public static void main(String[] args) {
		Won2Dollar toDollar = new Won2Dollar(1200);
		toDollar.run();
	}
}
prac 5_4
import java.util.Scanner;

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

	public void run() {
		Scanner scanner = new Scanner(System.in);
		System.out.println(getSrcString() + "을 " +getDestString() + "로 바꿉니다.");
		System.out.print(getSrcString() + "을 입력하세요>> ");
		double val = scanner.nextDouble();
		double res = convert(val);
		System.out.println("변환 결과: " + res + getDestString() + "입니다.");
		scanner.close();
	}
}

class Km2Mile extends Converter {
	public Km2Mile (double ratio) {
		this.ratio = ratio;
	}
	protected double convert(double src) {
		return src/ratio;
	}
	protected String getSrcString() {
		return "KM";
	}
	protected String getDestString() {
		return "Mile";
	}
}

public class Practice {
	public static void main(String[] args) {
		Km2Mile toMile = new Km2Mile(1.6);
		toMile.run();
	}
}
prac 5_5
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 {
	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() {
		return(color + "색의 " + "(" + getX() + "," + getY() + ")의 점");
	}
}

public class Practice {
	public static void main(String[] args) {
		ColorPoint cp = new ColorPoint(5, 5, "YELLOW");
		cp.setXY(10,20);
		cp.setColor("RED");
		String str = cp.toString();
		System.out.println(str + "입니다.");
	}
}
prac 5_6
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 {
	String color;
	
	public ColorPoint() {
		super(0,0);
		this.color= "BLACK";
	}
	
	public ColorPoint(int x, int y) {
		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 toString() {
		return(color + "색의 " + "(" + getX() + "," + getY() + ")의 점");
	}
}

public class Practice {
	public static void main(String[] args) {
		ColorPoint zeroPoint = new ColorPoint();
		System.out.println(zeroPoint.toString() + "입니다");
		
		ColorPoint cp = new ColorPoint(10,10);
		cp.setXY(5,5);
		cp.setColor("RED");
		System.out.println(cp.toString() + "입니다.");
	}
}
prac 5_7
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 Point3D extends Point {
	int z;
	
	public Point3D(int x, int y, int z) {
		super(x,y);
		this.z = z;
	}
	public int getZ() {
		return z;
	}
	public void move(int x, int y, int z) {
		move(x,y);
		this.z = z;
	}
	public void moveUp() {
		z++;
	}
	public void moveDown() {
		z--;
	}
	public String toString() {
		return("(" + getX() + "," + getY() + "," + getZ() + ")의 점");
	}
}

public class Practice {
	public static void main(String[] args) {
		Point3D p = new Point3D(1,2,3);
		System.out.println(p.toString() + "입니다");
		
		p.moveUp();
		System.out.println(p.toString() + "입니다");
		p.moveDown();
		p.move(10,10);
		System.out.println(p.toString() + "입니다");
		
		p.move(100,200,300);
		System.out.println(p.toString() + "입니다.");
	}
}
prac 5_8
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 PositivePoint extends Point {
	public PositivePoint() {
		super(0, 0);
	}
	public PositivePoint(int x, int y) {
		super(x, y);
		if(x < 0 || y < 0) { //둘 다 음수일 경우 0,0 으로 move
			super.move(0, 0); 
		}
	}
	@Override
	public void move(int x, int y) {//둘 다 양수일 경우 move
		if(x > 0 && y > 0 ) {
			super.move(x, y);
		}
	}
	public String toString() {
		return("(" + getX() + "," + getY() +  ")의 점");
	}
}

public class Practice {
	public static void main(String[] args) {
		PositivePoint p = new PositivePoint();
		p.move(10, 10);
		System.out.println(p.toString() + "입니다");
		
		p.move(-5, 5);
		System.out.println(p.toString() + "입니다");
		
		PositivePoint p2 = new PositivePoint(-10, -10);
		System.out.println(p2.toString() + "입니다");
	}
}
prac 5_9
import java.util.Scanner;

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

class StringStack implements Stack {
	private String[] stack;
	private int top;
	
	public StringStack(int capacity) {
		stack = new String[capacity];
		top = -1;
	}
	@Override
	public int length() {
		return top+1;
	}
	@Override
	public int capacity() {
		return stack.length;
	}
	@Override
	public String pop() {
		if(top==-1) { 
			return null;
		}
		String s = stack[top];
		top--;
		return s;
	}
	@Override
	public boolean push(String val) {
		if(top == stack.length-1) {
			return false;
		}
		else {
			top++;
			stack[top]= val;
			return true;
		}
	}
}

public class pr5_9 { //stackapp 클래스
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		System.out.print("총 스택 저장 공간의 크기 입력 >> ");
		int n = scanner.nextInt();
		StringStack ss = new StringStack(n);
		
		while(true) {
			System.out.print("문자열 입력 >> ");
			String str = scanner.next();
			
			if(str.equals("그만"))
				break;
			boolean res = ss.push(str);
			
			if(res == false)
				System.out.println("스택이 꽉 차서 푸시 불가!");
		}
		
		System.out.print("스택에 저장된 모든 문자열 팝: ");
		int len = ss.length();
		for(int i = 0; i<len; i++) {
			System.out.print(ss.pop() + " ");
		}
		scanner.close();
	}
}

prac 5_10은 사진으로 넣기

prac 5_11
import java.util.Scanner;

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

class Add extends Calc {
	public int calculate() {
		return a + b;
	}
}
class Mul extends Calc {
	public int calculate() {
		return a * b;
	}
}
class Sub extends Calc {
	public int calculate() {
		return a - b;
	}
}
class Div extends Calc {
	public int calculate() {
		return a / b;
	}
}
public class Practice {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		System.out.print("두 정수와 연산자를 입력하시오>> ");
		int a = scanner.nextInt();
		int b = scanner.nextInt();
		char op = scanner.next().charAt(0);
		
		Calc exp;
		switch (op) {
		case '+': 
			exp = new Add();
			break;
		case '-':
			exp = new Sub();
			break;
		case '*':
			exp = new Mul();
			break;
		case '/':
			exp = new Div();
			break;
		default:
			System.out.println("잘못된 입력");
			scanner.close();
			return;
		}
		
		exp.setValue(a, b);
		System.out.println(exp.calculate());
		scanner.close();
	}
}
prac 5_12
import java.util.Scanner;

abstract class Shape { //추상 클래스 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(); //추상메소드
}
class Line extends Shape {
	public Line() {}
	public void draw() {
		System.out.println("Line");
	}
}
class Rect extends Shape {
	public Rect() {}
	public void draw() {
		System.out.println("Rect");
	}
}
class Circle extends Shape {
	public Circle() {}
	public void draw() {
		System.out.println("Circle");
	}
}

class GraphicEditor {
	private Shape head, tail;
	private Scanner sc;
	
	public GraphicEditor() {
		head = null;
		tail = null;
		sc = new Scanner(System.in);
	}
	void run() { //실행 메소드
		System.out.println("그래픽 에디터 beauty을 실행합니다.");
		while (true) {
			System.out.print("삽입(1), 삭제(2), 모두 보기(3), 종료(4)>>");
			int num = sc.nextInt();
			if(num == 1) {
				insert(); //
			}
			else if(num == 2) {
				System.out.print("삭제할 도형의 위치");
				int dInput = sc.nextInt();
				delete(dInput); //
			}
			else if( num == 3) {
				print();
			}
			else if( num == 4) {
				System.out.println("beauty를 종료합니다.");
				break;
			}
		}
	}
	
	void insert() { //삽입 메소드
		Shape s;
		System.out.print("Line(1), Rect(2), Circle(3)>> " );
		int num2 = sc.nextInt();
		
		if(num2 == 1) {
			s = new Line();  //shape 객체 s에 저장
		} else if(num2 == 2) {
			s = new Rect();
		} else {
			s = new Circle();
		}
		if(head ==null) {
			head = s; 
			tail = s;
		} else {
			tail.setNext(s);
			tail = s;
		}
	}
	
	void delete(int num) { //삭제 메소드
		Shape c = head;
		Shape t = head;
		int i;
		if (num == 1) {
			if (head == tail) {
				head = null;
				tail = null;
				return;
			} else {
				head = head.getNext();
				return;
			}
		}
		for(i = 1; i<num; i++) {
			t = c;
			c = c.getNext();
			
			if(c == null) {
				System.out.println("삭제할 수 없습니다.");
				return;
			}
		}
		t.setNext(c.getNext());
	}
	
	void print() { //출력
		Shape s = head;
		while(s != null) {
			s.draw();
			s = s.getNext();
		}
	}
}

public class Practice {
	public static void main(String[] args) {
		GraphicEditor g = new GraphicEditor();
		g.run();
	}
}
prac 5_13
interface Shape {
	final double PI = 3.14; 		//상수
	void draw();					//도형그리는 추상메소드
	double getArea();				//도형면적 리턴 추상메소드
	default public void redraw() {  //디폴트 메소드
		System.out.print("--- 다시 그립니다. ");
		draw();
	}
}

class Circle implements Shape {
	private int radius; //반지름 변수 radius 선언
	
	public Circle(int radius) {
		this.radius = radius;
	}
	@Override
	public void draw() {
		System.out.println("반지름이 " + radius + "인 원입니다.");
	}
	public double getArea() {
		return radius*radius*PI;
	}
}

public class Practice {
	public static void main(String[] args) {
		Shape donut = new Circle(10);
		donut.redraw(); 
		System.out.println("면적은 " + donut.getArea());
	}
}
prac 5_14
interface Shape {
	final double PI = 3.14; 		//상수
	void draw();					//도형그리는 추상메소드
	double getArea();				//도형면적 리턴 추상메소드
	default public void redraw() {  //디폴트 메소드
		System.out.print("--- 다시 그립니다. ");
		draw();
	}
}

class Circle implements Shape {
	private int radius; //반지름 변수 radius 선언
	
	public Circle(int radius) {
		this.radius = radius;
	}
	@Override
	public void draw() {
		System.out.println("반지름이 " + radius + "인 원입니다.");
	}
	public double getArea() {
		return radius*radius*PI;
	}
}

class Oval implements Shape {
	private int a, b;
	
	public Oval(int a, int b) {
		this.a = a;
		this.b = b;
	}
	@Override
	public void draw() {
		System.out.println(a + " x " + b + "에 내접하는 타원입니다.");
	}
	public double getArea() {
		return a*b*PI;
	}
}

class Rect implements Shape {
	private int a, b;
	
	public Rect(int a, int b) {
		this.a = a;
		this.b = b;
	}
	@Override
	public void draw() {
		System.out.println(a + " x " + b + "크기의 사각형입니다.");
	}
	public double getArea() {
		return a*b;
	}
}

public class Practice {
	public static void main(String[] args) {
		Shape [] list = new Shape[3];
		list[0] = new Circle(10);
		list[1] = new Oval(20,30);
		list[2] = new Rect(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());
	}
}

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