麻烦各位大神看看，是哪里出错了，小弟初学者。
package org.circle;
class Area
{
public static void main(String[] args)
{
final double PI = 3.1415;
double r; area;
r = 3;
area = PI * r * r;
System.out.println("圆的面积="+area);
}
}
[解决办法]
class Area
{
public static void main(String[] args)
{
final double PI = 3.1415;
double r, area;//here!!
r = 3;
area = PI * r * r;
System.out.println("圆的面积=" + area);
}
}
