[JAVA/수업 과제 practice] 상속 Lv. 1~2

✅ 답안과 비교하여 스스로 코드 개선점 짚어보기 완료(2022.01.06)

 

BASIC1. 상속 구조를 통한 학생-직원 관리 프로그램

name=홍길동, age=20, height=178.2, weight=70.0, grade=1, major=정보시스템공학과
name=김말똥, age=21, height=187.3, weight=80.0, grade=2, major=경영학과
name=강개순, age=23, height=167.0, weight=45.0, grade=4, major=정보통신학과
이름 : 박
나이 : 26
키 : 180
몸무게 : 71
급여 : 10000000
부서 : 기획부
계속 입력하시겠습니까? (y/n) : n
name=박, age=26, height=180.0, weight=71.0, salary=10000000, dept=기획부

Person.class

package com.reminder.inheritance_practice.extend;

public class Person {
	
	protected String name;
	private int age;
	private double height;
	private double weight;
	
	public Person() {}
	public Person(int age, double height, double weight) {
		this.age = age;
		this.height = height;
		this.weight = weight;
	}
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public double getHeight() {
		return height;
	}
	public void setHeight(double height) {
		this.height = height;
	}
	public double getWeight() {
		return weight;
	}
	public void setWeight(double weight) {
		this.weight = weight;
	}
	
	public String getInformation() {
		return "name=" + name + ", age=" + age + ", height=" + height + ", weight=" + weight;
	}

}

 

Student.class

package com.reminder.inheritance_practice.extend;

public class Student extends Person {
	
	private int grade;
	private String major;
	
	public Student() {}
	public Student(String name, int age, double height, double weight, int grade, String major) {
		super(age, height, weight);
		super.name = name;
		this.grade = grade;
		this.major = major;
	}
	
	public int getGrade() {
		return grade;
	}
	public void setGrade(int grade) {
		this.grade = grade;
	}
	public String getMajor() {
		return major;
	}
	public void setMajor(String major) {
		this.major = major;
	}
	
	public String getInformation() {
		return super.getInformation() + ", grade=" + grade + ", major=" + major;
	}

}

 

Employee.class

package com.reminder.inheritance_practice.extend;

public class Employee extends Person {
	
	private int salary;
	private String dept;
	
	public Employee() {}
	public Employee(String name, int age, double height, double weight, int salary, String dept) {
		super(age, height, weight);
		super.name = name;
		this.salary = salary;
		this.dept = dept;
	}
	
	public int getSalary() {
		return salary;
	}
	public void setSalary(int salary) {
		this.salary = salary;
	}
	public String getDept() {
		return dept;
	}
	public void setDept(String dept) {
		this.dept = dept;
	}
	
	public String getInformation() {
		return super.getInformation() + ", salary=" + salary + ", dept=" + dept;
	}

}

 

Application.class

package com.reminder.inheritance_practice.extend;

import java.util.Scanner;

public class Application {

	public static void main(String[] args) {
		
		/* A. Student */
		/* 객체배열 할당 */
		Student[] student = new Student[3];
		/* 객체 생성 */
		student[0] = new Student("홍길동", 20, 178.2, 70.0, 1, "정보시스템공학과");
		student[1] = new Student("김말똥", 21, 187.3, 80.0, 2, "경영학과");
		student[2] = new Student("강개순", 23, 167.0, 45.0, 4, "정보통신학과");
		
		for(Student students : student) {
			System.out.println(students.getInformation());
		}
		
		/* B. Employee */
		Employee[] employee = new Employee[10];
		
		Scanner scanner = new Scanner(System.in);
		int count=0;
		
		while(true) {
			System.out.print("이름 : ");
			String name = scanner.nextLine();
			System.out.print("나이 : ");
			int age = scanner.nextInt();
			System.out.print("키 : ");
			double height = scanner.nextDouble();
			System.out.print("몸무게 : ");
			double weight = scanner.nextDouble();
			System.out.print("급여 : ");
			int salary = scanner.nextInt();
			System.out.print("부서 : ");
			scanner.nextLine();
			String dept = scanner.nextLine();
			System.out.print("계속 입력하시겠습니까? (y/n) : ");
			String answer = scanner.nextLine();
			
			employee[count++] = new Employee(name, age, height, weight, salary, dept);
			
			if(!(answer.equalsIgnoreCase("y"))) {
				break;
			}
		}
		
		for(int i=0; i < count; i++) {
			System.out.println(employee[i].getInformation());
		}
	}

}

 

---

 

NORMAL1. 도형의 x, y 좌표 값 및 원-사각형의 면적과 둘레 계산하기

수업시간에 printf 구문을 처음 다뤘다. 소수점 첫째자리까지 출력하는 방법으로 예를 들어 주셨다.

앞으로는 향상된 for문 사용법에 익숙해져야 할 것 같다.

===== circle =====
(x, y) : (1, 2)
면적 : 28.3
둘레 : 18.8
(x, y) : (3, 3)
면적 : 50.3
둘레 : 25.1
===== rectangle =====
(x, y) : (-1, -2)
면적 : 10
둘레 : 14
(x, y) : (-2, 5)
면적 : 16
둘레 : 20

Application.class

package com.reminder.inheritance_practice.extend2;

public class Application {

	public static void main(String[] args) {
		
		/* 크기가 2인 Circle 배열 할당 */
		Circle[] circ = new Circle[2];
		/* 객체 데이터 초기화 */
		circ[0] = new Circle(1, 2, 3);
		circ[1] = new Circle(3, 3, 4);
		
		/* 크기가 2인 Rectangle 배열 할당 */
		Rectangle[] rect = new Rectangle[2];
		/* 객체 데이터 초기화 */
		rect[0] = new Rectangle(-1, -2, 5, 2);
		rect[1] = new Rectangle(-2, 5, 2, 8);
		
		System.out.println("===== circle =====");
		for(Circle circle : circ) {
			circle.draw();
		}
		
		System.out.println("===== rectangle =====");
		for(Rectangle rectangle : rect) {
			rectangle.draw();
		}
	}

}

 

Circle.class

package com.reminder.inheritance_practice.extend2;

public class Circle extends Point {
	
	private int radius;
	
	public Circle() {}
	public Circle(int x, int y, int radius) {
		super(x, y);
		this.radius = radius;
	}
	
	public int getRadius() {
		return radius;
	}
	public void setRadius(int radius) {
		this.radius = radius;
	}
	
	@Override
	public void draw() {
		super.draw();
		System.out.printf("면적 : %.1f%n", (float)Math.PI * radius * radius);
		System.out.printf("둘레 : %.1f%n", (float)Math.PI * radius * 2);
	}

}

 

Rectangle.class

package com.reminder.inheritance_practice.extend2;

public class Rectangle extends Point {
	
	private int width;
	private int height;
	
	public Rectangle() {}
	public Rectangle(int x, int y, int width, int height) {
		super(x, y);
		this.width = width;
		this.height = height;
	}
	
	public int getWidth() {
		return width;
	}
	public void setWidth(int width) {
		this.width = width;
	}
	public int getHeight() {
		return height;
	}
	public void setHeight(int height) {
		this.height = height;
	}
	
	@Override
	public void draw() {
		super.draw();
		System.out.printf("면적 : %d%n", width * height);
		System.out.printf("둘레 : %d%n", (width + height) * 2);
	}

}

 

Point.class

package com.reminder.inheritance_practice.extend2;

public class Point {
	
	private int x;
	private int y;
	
	public Point() {}
	public Point(int x, int y) {
		this.x = x;
		this.y = y;
	}
	
	public int getX() {
		return x;
	}
	public void setX(int x) {
		this.x = x;
	}
	public int getY() {
		return y;
	}
	public void setY(int y) {
		this.y = y;
	}
	
	public void draw() {
		System.out.println("(x, y) : " + "(" + x + ", " + y + ")");
	}

}