20250508_java10

package com;

	class Book {
	String title;
	String author;

	public Book (String t){
		title = t;
		author = "작자 미상";	
	}

	public Book (String t, String a) {
		title = t;
		author = a;
	}

public static void main(String[] args) {
	Book littlePrince = new Book("어린 왕자","생텍쥐베리");
	Book loveStory = new Book("춘향전");
	System.out.println(littlePrince.title + "의 면적은" + littlePrince.author);
	System.out.println(loveStory.title + "의 면적은" + littlePrince.author);
}
}​

import java.util.*;
//import ;

public class Rectangle01{
	int width;
	int height;
	public int getArea() {
	return width*height;
	
}
public static void main(String[] args) {
	Rectangle01 rect=new Rectangle01();
	Scanner scaner = new Scanner(System.in);
	System.out.println(">>");
	rect.width=scanner.nextInt();  //scanner 오류
	rect.width=scanner.nextInt();
}
}

package com;

public class Circle {
	int radius;
	String name;

	public double getArea() {
	return 3.14*radius*radius;
	}


public static void main(String[] args) {
	Circle pizza;
	pizza = new Circle();
	pizza.radius = 10;
	pizza.name = "자바피자";
	double area = pizza.getArea();
	System.out.println(pizza.name + "의 면적은" + area);
	
	Circle donut = new Circle();
	donut = new Circle();
	donut.radius = 2;
	donut.name = "자바도넛";
	area = donut.getArea();
	System.out.println(donut.name + "의 면적은" + area);
	
}
}

package com;

public class Circle08 {
	int radius;
	void set(int r) {
	radius=r;
}
	double getArea() {
		return 3.14*radius*radius;
}
	public Circle08(int r) {
		radius=r;
	}
	public Circle08() {
		radius=10;
	}

public static void main(String[] args) {
	Circle08 pizza = new Circle08(10);
	System.out.println(pizza.getArea());
	Circle08 donut = new Circle08();
	System.out.println(pizza.getArea());
	
}
}

package com;

public class Circle04 {
	int radius;
	String name;
	
	public Circle04(int r, String n) {
	radius = r;
	name = n;
	}
	public double getArea() {
		return 3.14*radius*radius;
	}
	public Circle04() {
		radius=10;
	}

public static void main(String[] args) {
	Circle04 pizza = new Circle04(10,"자바피자");
	double area = pizza.getArea();
	System.out.println(pizza.name + "의 면적은" + area);
	
	Circle04 donut = new Circle04(10,"자바피자");
	donut.name = "도넛피자";
	area = donut.getArea();
	System.out.println(pizza.name + "의 면적은" + area);
}
}