mularea.java

用于简单的图形的程序

interface area1 {
	abstract double area(double i, double j);
}

interface area2 {
	abstract double area(double r);
}

public class mularea implements area1,area2 {
	public double area(double i, double j) {
		return i * j;
	}

	public double area(double r) {
		return Math.PI * Math.pow(r, 2);
	}
}