Fruit扩展了HealthyFood，后者扩展了Food，但Fruit和HealthyFoods都不能访问私有字符串名

Question

指令：

在本练习中，您将创建一个带有HealthyFood子类的Food超类。HealthyFood还将有一个水果子类。创建这些类之后，在FoodTester类中测试结果。

Food类将有两个实例变量，一个存储名称，另一个存储卡路里。

食物也应该有两种存取器(吸气剂方法)：

public String getName()
public int getCal()

HealthyFood类将只有一个实例变量group，它表示食物组，并且应该具有以下访问器(getter方法)：

public String getGroup()

Fruit类将有两个实例变量，一个是布尔指示符(如果水果是局部的)，另一个是颜色。访问器方法应为：

public boolean isLocal()
public String getColor()

施工人员应遵循以下格式：

public Food (String foodName, int calories)
public HealthyFood(String foodName, int calories, String foodGroup)
public Fruit(String foodName, int calories, boolean isLocal, String foodColor)

最后，Food类应该有一个toString，用于打印：name有卡路里

例如：

Ice Cream has 200 calories

实际代码：

FoodTester.Java

public class FoodTester {
public static void main(String[] args) {

}
}

Fruit.java

public class Fruit extends HealthyFood {
private boolean local;
private String color;

public Fruit(String foodName, int calories, boolean isLocal, String foodColor){
super(name, calories, "Strings");
local = isLocal;
color = foodColor;
}

public boolean isLocal(){
return local;
}

public String getColor(){
return color;
}
}

HealthyFood.java

public class HealthyFood extends Food {
private String group;

public HealthyFood(String foodName, int calories, String foodGroup){
super(name, cal);
group = foodGroup;
}

public String getGroup(){
return group;
}
}

Food.java

public class Food {
private String name;
private int cal;

public Food(String foodName, int calories){
name = foodName;
cal = calories;
}

public String getName(){
return name;
}

public int getCal(){
return cal;
}

public String toString(){
return name + " has " + cal + " calories";
}
}

错误消息：

HealthyFood.java:6: error: name has private access in Food
super(name, cal);
^
HealthyFood.java:6: error: cal has private access in Food
super(name, cal);
^
Fruit.java:7: error: name has private access in Food
super(name, calories, "Strings");
^
3 errors

Answer 1

尝试这样修改：

public HealthyFood(String foodName, int calories, String foodGroup){
super(foodName, calories);

和

public Fruit(String foodName, int calories, boolean isLocal, String foodColor){
super(foodName, calories, "Strings");

您应该将foodName或calibles作为超级构造函数的参数。