package cn.edu.bjut.chapter4;

public class Square extends Rectangle {
	public Square(int length) {
		super(length, length); 
	}

	public int area() {
		System.out.println(this.getClass().getName());
		return (length * length); 
	}

	public int perimeter() {
		System.out.println(this.getClass().getName());
		return (length << 2); 
	}
}