squaretest.txt

求一个正方形面积的简单程序 给小菜鸟参考用的 本人自己写的小程序

interface Interfaceshape{
	public void area();
}
class Square implements Interfaceshape{
	double n;
	public Square(double k){
		n=k;
	}
	public void area(){
		double area=0;
		area=n*n;
		System.out.println("正方形的面积为："+area);
	}
}
public class SquareTest {
public static void main(String args[]){
	System.out.println("现有一边长为3.6的正方形");
	Square Square1 =new Square(3.6);
	Square1.area();
}
}