咋整啊，呜呜呜呜。。。

import java.util.HashMap;

public class Test {
	public static void main(String[] args) {
		Shape s = new Square (10);
		s.draw();
		Shape rect = new Rectangle();
		s.draw();
	
	}
}
interface Shape{
	void draw();
}
class Square implements Shape{
	
	@Override
	public void draw() {
		
		System.out.println("画正方形");
	}
	
}
class Rectangle implements Shape{
	@Override
	public void draw() {
		
		System.out.println("画长方形");
	}
	
}