public class fruit{
     private int fid;
     public String color;
     public String shape;
     public String name;
     public float price;
     public double sum;

     public void buyingfruit(){
         System.out.printf("你买的水果是%s,",name);
         System.out.printf("%f每斤%n",price);
         System.out.printf("你共买了%f斤%n",sum);
         System.out.printf("共计%f元%n",price*sum);
     }
 }
 public class Apple extends fruit{
     public static void main(String[]args){
         Apple apple=new Apple();
apple.color="红色";
apple.name="红富士苹果";
apple.price=2.5f;
apple.shape="圆形";
apple.sum=2.5f;
apple.buyingfruit();
     }
 }
说是在子类中访问父类的成员变量和方法，可是运行的时候出现这种情况，要在Apple.java文件中声明，该怎么解决？

问题贴出来

能告诉我是怎么一回事吗？

你的两个类应该是写在同一个文件中了吧

两个类啊这是，看了半天都蒙住了

在一个类中,只能有一个public公共类,此代码我已经帮您修改过,您再看下就明白了.

class fruit {
    public String color;
    public String shape;
    public String name;
    public float price;
    public double sum;

    public void buyingfruit() {
        System.out.printf("你买的水果是%s,", name);
        System.out.printf("%f每斤%n", price);
        System.out.printf("你共买了%f斤%n", sum);
        System.out.printf("共计%f元%n", price * sum);
    }
}

public class Apple extends fruit {
    public static void main(String[] args) {
        Apple apple = new Apple();
        apple.color = "红色";
        apple.name = "红富士苹果";
        apple.price = 2.5f;
        apple.shape = "圆形";
        apple.sum = 2.5f;
        apple.buyingfruit();

    }

}

Fruit.java

package thread_436995;

public class Fruit {
    private int fid;
    public String color;
    public String shape;
    public String name;
    public float price;
    public double sum;

    public void buyingfruit() {
        System.out.printf("你买的水果是%s,", name);
        System.out.printf("%f每斤%n", price);
        System.out.printf("你共买了%f斤%n", sum);
        System.out.printf("共计%f元%n", price * sum);
    }
}

Apple.java

package thread_436995;

public class Apple extends Fruit {
    public static void main(String[] args) {
        Apple apple = new Apple();
        apple.color = "红色";
        apple.name = "红富士苹果";
        apple.price = 2.5f;
        apple.shape = "圆形";
        apple.sum = 2.5f;
        apple.buyingfruit();
    }
}

输出：

你买的水果是红富士苹果,2.500000每斤
你共买了2.500000斤
共计6.250000元

忠告：赶紧下载一个IDE，比如Eclipse，大多数问题都能解决
学Java，没有必要从记事本开始写程序，虽然大多数老师都是这么说的……

是不是说每次运行这个Java文件时都会出现两个Java文件，一个是fruitjava和Apple.java ？@8楼

把public 去掉就没有这个提示了，我也是初学者