☕ Java
[Java] 명품 JAVA Programming 5장 실습 코드
dmaolon
2022. 8. 7. 23:16
CH.05 상속
[Java] 상속 || Java Programming
1. 개념 상속이란, 부모 클래스의 필드와 메서드를 자식 클래스가 물려받는 것이다. 부모 클래스 == 슈퍼 클래스 자식 클래스 == 서브 클래스 ❗상속의 장점 코드 중복을 제거하여 클래스가 간결
dmaolon00.tistory.com
Bear & Fish Game
Bear
import java.util.Scanner;
public class Bear extends GameObject{
public Bear(int startX, int startY, int distancce) {
super(startX, startY, distancce);
}
@Override
protected void move() {
Scanner sc = new Scanner(System.in);
String cmd = sc.nextLine();
switch (cmd) {
case "a":
this.y -= 1;
break;
case "s":
this.x += 1;
break;
case "w":
this.x -= 1;
break;
case "d":
this.y += 1;
break;
}
}
@Override
protected char getShape() {
return 'B';
}
}Fish
public class Fish extends GameObject{
public Fish(int startX, int startY, int distancce) {
super(startX, startY, distancce);
}
@Override
protected void move() {
int i = (int) (Math.random() * 4);
switch (i) {
case 0:
this.y -= 1;
break;
case 1:
this.x += 1;
break;
case 2:
this.x -= 1;
break;
case 3:
this.y += 1;
break;
}
}
@Override
protected char getShape() {
return '@';
}
}GameObject
/*
추상 클래스 GameObject
*/
public abstract class GameObject {
protected int distance; // 이동 거리
protected int x, y; // 현재 위치
// 초기 위치 설정
public GameObject(int startX, int startY, int distancce) {
this.x = startX;
this.y = startY;
this.distance = distancce;
}
public int getX() {
return x;
}
public int getY() {
return y;
}
// 충돌 확인
public boolean collide(GameObject gameObject) {
if (this.x == gameObject.getX() && this.y == gameObject.getY())
return true;
else
return false;
}
// 이동
protected abstract void move();
// 객체의 모양
protected abstract char getShape();
}Game
import java.io.*;
public class Game {
public static void main(String[] args) throws IOException {
Bear bear = new Bear(0, 0, 1);
Fish fish = new Fish(5, 5, 1);
System.out.println("** Bear의 fish 먹기 게임을 시작합니다. **");
int cnt = 0;
while(true){
for (int i = 0; i < 10; i++) {
for (int j = 0; j < 20; j++) {
if (bear.getX() == i && bear.getY() == j) {
System.out.print(bear.getShape());
continue;
}else if (fish.getX() == i && fish.getY() == j) {
System.out.print(fish.getShape());
continue;
}
System.out.print("-");
}
System.out.println();
}
if (bear.collide(fish)) {
System.out.println("Bear Wins!!!");
break;
}
System.out.print("왼쪽(a), 아래(s), 위(w), 오른쪽(d) >> ");
bear.move();
if (cnt == 5) {
cnt = 0;
}
if ((int) Math.random() * 2 == 0 && cnt < 2) {
fish.move();
cnt++;
} else {
cnt++;
}
}
}
}
CH.05 실습문제
import java.util.Scanner;
class Q1_TV {
private int size;
public Q1_TV(int size) {
this.size = size;
}
protected int getSize() {
return size;
}
}
class Q1_ColorTV extends Q1_TV{
private int color;
public Q1_ColorTV(int size, int color) {
super(size);
this.color = color;
}
public void printProperty() {
System.out.println(super.getSize() + "인치 " + this.color + "컬러");
}
protected int getColor() {
return color;
}
}
class Q2_IPTV extends Q1_ColorTV{
private String ip;
public Q2_IPTV(String ip, int size, int color) {
super(size, color);
this.ip = ip;
}
@Override
public void printProperty() {
System.out.println("나의 IPTV는 " + this.ip + " 주소의 " + super.getSize() + "인치 " + super.getColor() + "컬러");
}
}
abstract class Q3_Converter {
abstract protected double convert(double src);
abstract protected String getSrcString();
abstract protected 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 Q3_Won2Dollar extends Q3_Converter{
public Q3_Won2Dollar(int ratio) {
this.ratio = ratio;
}
@Override
protected double convert(double src) {
return src / ratio;
}
@Override
protected String getSrcString() {
return "원";
}
@Override
protected String getDestString() {
return "달러";
}
}
class Q4_Km2Mile extends Q3_Converter{
public Q4_Km2Mile(double ratio) {
this.ratio = ratio;
}
@Override
protected double convert(double src) {
return src / ratio;
}
@Override
protected String getSrcString() {
return "Km";
}
@Override
protected String getDestString() {
return "Mile";
}
}
class Q5_Point {
private int x, y;
public Q5_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 Q5_ColorPoint extends Q5_Point{
private String color;
public Q5_ColorPoint(int x, int y, String color) {
super(x, y);
this.color = color;
}
public Q5_ColorPoint() {
super(0, 0);
this.color = "BLACK";
}
public Q5_ColorPoint(int x, int y) {
super(x, y);
this.color = "BLACK";
}
public void setXY(int x, int y) {
super.move(x, y);
}
public void setColor(String color) {
this.color = color;
}
@Override
public String toString() {
return color + "색의 (" + super.getX() + ", " + super.getY() + ")의 점";
}
}
class Q7_Point3D extends Q5_Point{
private int z;
public Q7_Point3D(int x, int y, int z) {
super(x, y);
this.z = z;
}
@Override
public String toString() {
return "(" + super.getX() + ", " + super.getY() + ", " + this.z + ")의 점";
}
public void moveUp() {
this.z += 1;
}
public void moveDown() {
this.z -= 1;
}
public void move(int x, int y, int z) {
super.move(x, y);
this.z = z;
}
}
class Q8_PositivePoint extends Q5_Point{
public Q8_PositivePoint(int x, int y) {
super(x, y);
if (x < 0 || y < 0){
super.move(0, 0);
}
}
public Q8_PositivePoint() {
super(0, 0);
}
@Override
protected void move(int x, int y) {
if (x < 0 || y < 0) {
return ;
}
super.move(x, y);
}
@Override
public String toString() {
return "(" + super.getX() + ", " + super.getY() + ")의 점";
}
}
interface Q9_Stack {
int length();
int capacity();
String pop();
boolean push(String val);
}
class Q9_StringStack implements Q9_Stack {
private int size;
private int n;
private String[] stack;
public Q9_StringStack(int size) {
this.size = size;
this.n = 0;
stack = new String[size];
}
@Override
public int length() {
return n;
}
@Override
public int capacity() {
return size;
}
@Override
public String pop() {
if (n == 0) {
return null;
}
return stack[--n];
}
@Override
public boolean push(String val) {
if (n == size) {
return false;
}
stack[n++] = val;
return true;
}
}
abstract class Q10_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 Q10_Dictionary extends Q10_PairMap {
private int size;
private int n;
public Q10_Dictionary(int size) {
this.size = size;
this.n = 0;
keyArray = new String[size];
valueArray = new String[size];
}
@Override
String get(String key) {
for (int i = 0; i < size; i++) {
if (key == keyArray[i]) {
return valueArray[i];
}
}
return null;
}
@Override
void put(String key, String value) {
for (int i = 0; i < size; i++) {
if (key == keyArray[i]) {
valueArray[i] = value;
return ;
}
}
keyArray[n] = key;
valueArray[n++] = value;
}
@Override
String delete(String key) {
for (int i = 0; i < size; i++) {
if (key == keyArray[i]) {
keyArray[i] = null;
valueArray[i] = null;
}
}
return "해당하는 키는 존재하지 않습니다.";
}
@Override
int length() {
return n;
}
}
abstract class Q11_Calc {
int a;
int b;
abstract void setValue(int a, int b);
abstract int calculate();
}
class Q11_Add extends Q11_Calc{
@Override
void setValue(int a, int b) {
this.a = a;
this.b = b;
}
@Override
int calculate() {
return a + b;
}
}
class Q11_Sub extends Q11_Calc{
@Override
void setValue(int a, int b) {
this.a = a;
this.b = b;
}
@Override
int calculate() {
return a -b;
}
}
class Q11_Mul extends Q11_Calc{
@Override
void setValue(int a, int b) {
this.a = a;
this.b = b;
}
@Override
int calculate() {
return a * b;
}
}
class Q11_Div extends Q11_Calc{
@Override
void setValue(int a, int b) {
this.a = a;
this.b = b;
}
@Override
int calculate() {
return a / b;
}
}
abstract class Q12_Shape {
private Q12_Shape next;
public Q12_Shape(){
next = null;
}
public void setNext(Q12_Shape obj) {
next = obj;
}
public Q12_Shape getNext() {
return next;
}
public abstract void draw();
}
class Q12_Line extends Q12_Shape {
@Override
public void draw() {
System.out.println("Line");
}
}
class Q12_Rect extends Q12_Shape {
@Override
public void draw() {
System.out.println("Rect");
}
}
class Q12_Circle extends Q12_Shape {
@Override
public void draw() {
System.out.println("Circle");
}
}
class Q12_GraphicEditor{
private Q12_Shape start, end;
private int size;
public Q12_GraphicEditor() {
start = null;
end = null;
size = 0;
}
void run() {
Scanner sc = new Scanner(System.in);
outer:
while (true) {
System.out.print("삽입(1), 삭제(2), 모두 보기(3), 종료(4) >> ");
int cmd = sc.nextInt();
Q12_Shape shape = null;
switch (cmd) {
case 1:
System.out.print("Line(1), Rect(2), Circle(3) >> ");
int cmd2 = sc.nextInt();
if (cmd2 == 1) {
shape = new Q12_Line();
} else if (cmd2 == 2) {
shape = new Q12_Rect();
} else if (cmd2 == 3) {
shape = new Q12_Circle();
}
if (start == null) {
start = shape;
end = shape;
} else {
end.setNext(shape);
end = shape;
}
size++;
break;
case 2:
System.out.print("삭제할 도형의 위치 >> ");
int n = sc.nextInt();
if (n > size) {
System.out.println("삭제할 수 없습니다.");
break;
}
shape = start;
if (shape == null) {
System.out.println("삭제할 것이 없습니다.");
}
Q12_Shape shape2 = start;
for (int i = 1; i < n; i++) {
if (i == n - 2 && n > 2) {
shape2 = shape.getNext();
}
shape = shape.getNext();
}
if (shape == start) {
if (shape.getNext() != null) {
start = shape.getNext();
} else {
start = null;
}
} else if (shape == end) {
end = shape2;
shape2.setNext(null);
} else {
shape2.setNext(shape.getNext());
}
size--;
break;
case 3:
shape = start;
if (shape == null) {
System.out.println("삽입된 것이 없습니다.");
break;
}
shape.draw();
for (int i = 1; i < size; i++) {
shape = shape.getNext();
shape.draw();
}
break;
case 4:
break outer;
}
}
}
}
interface Q13_Shape {
final double PI = 3.14;
void draw();
double getArea();
default public void redraw() {
System.out.print("--- 다시 그립니다. ");
draw();
}
}
class Q13_Circle implements Q13_Shape {
private int n;
public Q13_Circle(int n) {
this.n = n;
}
@Override
public void draw() {
System.out.println("반지름이 " + n + "인 원입니다.");
}
@Override
public double getArea() {
return n * n * PI;
}
}
class Q14_Oval implements Q13_Shape {
private int x;
private int y;
public Q14_Oval(int x, int y) {
this.x = x;
this.y = y;
}
@Override
public void draw() {
System.out.println(x + "x" + y + "에 내접하는 타원입니다.");
}
@Override
public double getArea() {
return x * y * PI;
}
}
class Q14_Rect implements Q13_Shape {
private int x;
private int y;
public Q14_Rect(int x, int y) {
this.x = x;
this.y = y;
}
@Override
public void draw() {
System.out.println(x + "x" + y + "크기의 사각형입니다.");
}
@Override
public double getArea() {
return x * y;
}
}
public class Inheritance {
public static void main(String[] args) {
// System.out.println("========= Q1 =========");
// Q1_ColorTV q1_colorTV = new Q1_ColorTV(32, 1024);
// q1_colorTV.printProperty();
// System.out.println("========= Q2 =========");
// Q2_IPTV q2_iptv = new Q2_IPTV("192.1.1.2", 32, 2048);
// q2_iptv.printProperty();
// System.out.println("========= Q3 =========");
// Q3_Won2Dollar q3_won2Dollar = new Q3_Won2Dollar(1200);
// q3_won2Dollar.run();
// System.out.println("========= Q4 =========");
// Q4_Km2Mile q4_km2Mile = new Q4_Km2Mile(1.6);
// q4_km2Mile.run();
// System.out.println("========= Q5 =========");
// Q5_ColorPoint q5_colorPoint = new Q5_ColorPoint(5, 5, "YELLO");
// q5_colorPoint.setXY(10, 20);
// q5_colorPoint.setColor("RED");
// String str = q5_colorPoint.toString();
// System.out.println(str + "입니다.");
// System.out.println("========= Q6 =========");
// Q5_ColorPoint q6_colorPoint = new Q5_ColorPoint();
// System.out.println(q6_colorPoint.toString() + "입니다.");
//
// Q5_ColorPoint q6_colorPoint2 = new Q5_ColorPoint(10, 10);
// q6_colorPoint2.setXY(5, 5);
// q6_colorPoint2.setColor("RED");
// System.out.println(q6_colorPoint2.toString() + "입니다.");
// System.out.println("========= Q7 =========");
// Q7_Point3D q7_point3D = new Q7_Point3D(1, 2, 3);
// System.out.println(q7_point3D.toString() + "입니다.");
//
// q7_point3D.moveUp();
// System.out.println(q7_point3D.toString() + "입니다.");
//
// q7_point3D.moveDown();
// q7_point3D.move(10, 10);
// System.out.println(q7_point3D.toString() + "입니다.");
//
// q7_point3D.move(100, 200, 300);
// System.out.println(q7_point3D.toString() + "입니다.");
// System.out.println("========= Q8 =========");
// Q8_PositivePoint q8_positivePoint = new Q8_PositivePoint();
// q8_positivePoint.move(10, 10);
// System.out.println(q8_positivePoint.toString() + "입니다.");
//
// q8_positivePoint.move(-5, 5);
// System.out.println(q8_positivePoint.toString() + "입니다.");
//
// Q8_PositivePoint q8_positivePoint2 = new Q8_PositivePoint(-10, -10);
// System.out.println(q8_positivePoint2.toString() + "입니다.");
// System.out.println("========= Q9 =========");
// System.out.print("총 스택 저장 공간의 크기 입력 >> ");
Scanner sc = new Scanner(System.in);
// int n = sc.nextInt();
// Q9_StringStack q9_stringStack = new Q9_StringStack(n);
//
// while (true) {
// System.out.print("문자열 입력 >> ");
// String str = sc.next();
// if (!q9_stringStack.push(str)) {
// System.out.println("스택이 꽉 차서 푸시 불가!");
// }
// if (str.equals("그만")) {
// System.out.print("스택에 저장된 모든 문자열 팝 : ");
// while (true) {
// String pop = q9_stringStack.pop();
// if (pop == null) {
// break;
// }
// System.out.print(pop + " ");
// }
// break;
// }
// }
// System.out.println("========= Q10 =========");
// Q10_Dictionary q10_dictionary = new Q10_Dictionary(10);
// q10_dictionary.put("가나다", "자바");
// q10_dictionary.put("라마바", "파이썬");
// q10_dictionary.put("라마바", "자바스크립트");
// System.out.println("라마바의 값은 " + q10_dictionary.get("라마바"));
// System.out.println("가나다의 값은 " + q10_dictionary.get("가나다"));
//
// q10_dictionary.delete("가나다");
// System.out.println("가나다의 값은 " + q10_dictionary.get("가나다"));
// System.out.println("========= Q11 =========");
// System.out.print("두 정수와 연산자를 입력하시오 >> ");
// int x = sc.nextInt();
// int y = sc.nextInt();
// String s = sc.next();
//
// switch (s) {
// case "+":
// Q11_Add q11_add = new Q11_Add();
// q11_add.setValue(x, y);
// System.out.println(q11_add.calculate());
// break;
// case "-":
// Q11_Sub q11_sub = new Q11_Sub();
// q11_sub.setValue(x, y);
// System.out.println(q11_sub.calculate());
// break;
// case "*":
// Q11_Mul q11_mul = new Q11_Mul();
// q11_mul.setValue(x, y);
// System.out.println(q11_mul.calculate());
// break;
// case "/":
// Q11_Div q11_div = new Q11_Div();
// q11_div.setValue(x, y);
// System.out.println(q11_div.calculate());
// break;
// }
// System.out.println("========= Q12 =========");
// System.out.println("그래픽 에디어 beauty을 실행합니다.");
// Q12_GraphicEditor q12_graphicEditor = new Q12_GraphicEditor();
// q12_graphicEditor.run();
// System.out.println("beauty를 종료합니다.");
// System.out.println("========= Q13 =========");
// Q13_Circle q13_circle = new Q13_Circle(10);
// q13_circle.redraw();
// System.out.println("면접은 " + q13_circle.getArea());
System.out.println("========= Q14 =========");
Q13_Shape[] q13_shapes = new Q13_Shape[3];
q13_shapes[0] = new Q13_Circle(10);
q13_shapes[1] = new Q14_Oval(20, 30);
q13_shapes[2] = new Q14_Rect(10, 40);
for (int i = 0; i < q13_shapes.length; i++) {
q13_shapes[i].redraw();
}
for (int i = 0; i < q13_shapes.length; i++) {
System.out.println("면적은 " + q13_shapes[i].getArea());
}
}
}반응형