class zhengfangxing{
int chang;
zhengfangxing(int long1){chang=long1;}
void show()
{
System.out.println("正方形的周长是"+(4*chang));
}
}
class changfangxing extends zhengfangxing{
int chang,kuan;
changfangxing(int long1,int k)
{ super(long1);
kuan=k;}
void show()
{
System.out.println("长方形的周长是"+(2*(chang+kuan)));
}
}
public class chongxie{
public static void main(String [] args){
zhengfangxing a=new zhengfangxing(5);
a.show();
changfangxing b=new changfangxing(5,7);
b.show();
}
}
changfangxing类中的chang无法调用父类的数据 为什么 谢谢