[JAVA] 10. 클래스와 객체 Ⅰ. Circle 클래스

package ex04;

class Circle {
    public int radius;
    String color;

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

public class CircleTest {
    public static void main(String[] args) {
        Circle obj;
        obj = new Circle();
        obj.radius = 100;
        obj.color = "red";
        double area = obj.getArea();
        System.out.println("원의 면적: " + area);
    }
}