Question

java编程错误

public class telephone2 {
public class Telephone2 {
int a ; //拨出号码
int n;//拨打市内电话次数
int l;//拨打长途次数
double left;//话费余额
}

class OrdinaryPhone extends Telephone2{
int month;//包月时长
double regularCost=20.0*month;//月租总开销
double cost=0.2*n+0.4*l+20.0*month;//包月外话费与月租之和
public void way1(){
if(left<cost){
left=left;
System.out.println("话费余额不足，欠费待缴"+"话费剩余是"+left);
}else{
left=left-cost;
System.out.println("扣费后话费余额为"+left);
}
}
}

class MobilePhone extends Telephone2{
double cost=l*0.4+n*0.4;
public void way2(){
if(left<cost){
left=left;
System.out.println("话费余额不足，欠费待缴"+"话费剩余是"+left);
}else{
left=left-cost;
System.out.println("扣费后话费余额为"+left);
}
}
}

public static void main(String[] args) {
OrdinaryPhone ordinary= new OrdinaryPhone();
MobilePhone mobile=new MobilePhone();
ordinary.n=10;
ordinary.l=10;
mobile.n=5;
mobile.l=15;
ordinary.way1();
mobile.way2();
System.out.println("OrdinaryPhone话费余额为"+ordinary.left);
System.out.println("MobilePhone话费余额为"+mobile.left);
}
}

运行结果显示Exception in thread "main" java.lang.Error: Unresolved compilation problem:
No enclosing instance of type telephone2 is accessible. Must qualify the allocation with an enclosing instance of type telephone2 (e.g. x.new A() where x is an instance of telephone2).

at telephone2.main(telephone2.java:40)
在System.out.println("OrdinaryPhone话费余额为"+ordinary.left);位置显示no enclosing type of telephone2 is accessiable
请问哪里有问题？谢谢

Answer 1

left初始化了吗