java

class Rect { 
	    private double w ,h; 
	    Rect(double w , double h) { 
	        this.w = w; 
	        this.h = h; 
	    } 
	    Rect (Rect s) { 
	        w = s.w; 
	        h = s.h; 
	    }
}
public void main(String s){
// rect也没有list啊 为什么能有类似的构造方法
	Rect s[] = new Rect[3];
	s[0] = new Rect(2,3);
	s[1] = new Rect(5,6); 
//这样的构造方法有设么用？
    s[2] = new Rect(new Rect(7,8)); 
}