JAVA | 제4장 클래스와 객체 실습문제

241p q2

package kr.co.kihd.practice04;

import java.util.Scanner;

//241p 2번문제
public class Grade {
	private int math;
	private int science;
	private int english;
	
	public Grade(int math, int science, int english) {
		super();
		this.math = math;
		this.science = science;
		this.english = english;
	}
	
	public double average() {
		double avg = (this.math + this.science + this.english)/3;
		
		return avg;
		
	}


	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		
		System.out.print("수학, 과학, 영어 순으로 3개의 점수 입력 >> ");
		int math = scan.nextInt();
		int science = scan.nextInt();
		int english = scan.nextInt();
		Grade me = new Grade(math, science, english);
		System.out.println("평균은 " + me.average()); //me.average()는 평균을 계산하여 리턴
		
		scan.close();
		
	}
}

 

241p q4

package kr.co.kihd.practice04;

//241p 4번문제
public class Rectangle {
	private int x;
	private int y;
	private int width;
	private int height;
	
	//생성자
	public Rectangle(int x, int y, int width, int height) {
		super();
		this.x = x;
		this.y = y;
		this.width = width;
		this.height = height;
	}
	
	public int square() {
		return width*height;
	}
	public void show() {
		System.out.printf("(%d,%d)에서 크기가 %dx%d인 사각형",
							this.x,this.y,this.width,this.height);
		System.out.println();
	}
	public boolean contains(Rectangle rectangle) {
		
		if(x < rectangle.x 
				&& y < rectangle.y 
				&& x + width > rectangle.x + rectangle.width
				&& y + height > rectangle.y + rectangle.height)
			return true;
		else
			return false;
		
		}
		



	public static void main(String[] args) {
		Rectangle r = new Rectangle(2, 2, 8, 7);
		Rectangle s = new Rectangle(5, 5, 6, 6);
		Rectangle t = new Rectangle(1, 1, 10, 10);
		
		r.show();
		System.out.println("s의 면적은 " + s.square());
		if(t.contains(r))System.out.println("t는 r을 포함합니다.");
		if(t.contains(s))System.out.println("t는 s을 포함합니다.");
	}
	
}