含运行代码，图上有题

java接口题，要含运行代码，题在上图，java，java，j

interface Shape{
   public abstract double area(double x);
}

class Square implements Shape{
   public double area(double x){
          return x*x;
   }
}
class Cicle implements Shape{
   public double area(double x){
          return Math.PI*x*x;
   }
}

public class test{
  public static void main(String[]args){
    Square s=new Square();
    System.out.println("正方形面积："+s.area(2) );
    Cicle c=new Cicle();
    System.out.println("圆形面积："+c.area(3) );
 
  }
}

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