public class test {

public static void main(String[] args) {

System.out.println("請(qǐng)輸入矩形的長(zhǎng)和寬");?

Shape rec=new Rectangle();

rec.perimeter();?

rec.area();?

System.out.println("請(qǐng)輸入圓的半徑");?

Shape cir=new Circle();?

cir.perimeter();

cir.area();?

}

}