5-10.txt

清华大学第二版

程序5-10
public class Circle {
	static double PI = 3.14159265;
	int radius;
	public double circumference() {
		return 2 * PI * radius;
	}
}

public class CircumferenceTester {
	public static void main(String args[]) {
		Circle c1 = new Circle();
		c1.radius = 50;
		Circle c2 = new Circle();
		c2.radius = 10;
		double circum1 = c1.circumference();
		double circum2 = c2.circumference(); 
		System.out.println("Circle 1 has circumference " + circum1);
		System.out.println("Circle 2 has circumference " + circum2);
	}
}