class Test
{
public static void main(String[] args)
{
Changfangxing c= new Changfangxing();
c.a =10;
c.b=20;
System.out.println(c.getzhouchang());
System.out.println(c.getmianji());
System.out.println(c.zhouchang);
}
}
class Changfangxing
{
int a;
int b;
int zhouchang= (a+b)*2 ;
public int getzhouchang()
{
return (a+b)*2 ;
}
public int getmianji()
{
return a*b;
}
}
//System.out.println(c.zhouchang); 输出结果？ 为什么？