写了一个代码编译器出现这样 ：请各位大神赐教
Test.java:8: 错误: 找不到符号
                Area p=new Area();
                           ^
  符号:   类 Area
  位置: 类 Test
2 个错误

import java.util.Scanner;
public class Test{
    public static void main(String[] args){
        Scanner input=new Scanner(System.in);
        double r,area;
        System.out.println("请输入半径r的值：");
        r=input.nextDouble();
        Area p=new Area();
        area=p.Area1(r);
        System.out.println("圆的面积为："+area);   
    }
      
}
******
final PI 3.14;
class Area{
    double r,area;
    void Area1(double r){
        this.area=PI*r*r;
        return area;
    }
}