Java 访问嵌套接口数据变量

我无法访问此代码的变量

I

：

interface three{
    void how();
    interface two{
        int i=2;
        void what();
    }
}

class one implements three,two{

    public void how(){
        System.out.println("\nHow! i = " + i);
        what();
    }

    public void what(){
        System.out.println("\nWhat! i = " + i);
    }

    public static void main(String args[]){
        one a = new one();
        a.how();
        a.what();

    }
}

生成的错误是：

one.java:17: error: cannot find symbol
System.out.println("\nWhat! i = " + i);                                          
symbol:   variable i
location: class one

---

您可以将其编码如下

我把这些课分开，供你参考

three.java

 public interface three{
   void how();
 }

 public interface two{
        int i=2;
        void what();
 }

class one implements two,three{
   public void how(){
      System.out.println("\nHow! i = " + i);
     what();
   }

   public void what(){
      System.out.println("\nWhat! i = " + i);
   }

   public static void main(String args[]){
     one a = new one();
     a.how();
     a.what();
   }
}

然后将其编译为javacThree.java

 public interface three{
   void how();
 }

 public interface two{
        int i=2;
        void what();
 }

class one implements two,three{
   public void how(){
      System.out.println("\nHow! i = " + i);
     what();
   }

   public void what(){
      System.out.println("\nWhat! i = " + i);
   }

   public static void main(String args[]){
     one a = new one();
     a.how();
     a.what();
   }
}

之后

two.java

 public interface three{
   void how();
 }

 public interface two{
        int i=2;
        void what();
 }

class one implements two,three{
   public void how(){
      System.out.println("\nHow! i = " + i);
     what();
   }

   public void what(){
      System.out.println("\nWhat! i = " + i);
   }

   public static void main(String args[]){
     one a = new one();
     a.how();
     a.what();
   }
}

编译为javactwo.java

 public interface three{
   void how();
 }

 public interface two{
        int i=2;
        void what();
 }

class one implements two,three{
   public void how(){
      System.out.println("\nHow! i = " + i);
     what();
   }

   public void what(){
      System.out.println("\nWhat! i = " + i);
   }

   public static void main(String args[]){
     one a = new one();
     a.how();
     a.what();
   }
}

然后

one.java

 public interface three{
   void how();
 }

 public interface two{
        int i=2;
        void what();
 }

class one implements two,three{
   public void how(){
      System.out.println("\nHow! i = " + i);
     what();
   }

   public void what(){
      System.out.println("\nWhat! i = " + i);
   }

   public static void main(String args[]){
     one a = new one();
     a.how();
     a.what();
   }
}

然后编译如下

javac one.java

 public interface three{
   void how();
 }

 public interface two{
        int i=2;
        void what();
 }

class one implements two,three{
   public void how(){
      System.out.println("\nHow! i = " + i);
     what();
   }

   public void what(){
      System.out.println("\nWhat! i = " + i);
   }

   public static void main(String args[]){
     one a = new one();
     a.how();
     a.what();
   }
}

在那之后把它当作

JavaOne

然后您将获得以下输出

 How! i = 2

 What! i = 2

 What! i = 2

在您的问题中，我理解的是接口三种方法无法访问接口二的I变量

或者您可以这样编码

three.java

 public interface three{
   void how();
 }

 public interface two{
        int i=2;
        void what();
 }

class one implements two,three{
   public void how(){
      System.out.println("\nHow! i = " + i);
     what();
   }

   public void what(){
      System.out.println("\nWhat! i = " + i);
   }

   public static void main(String args[]){
     one a = new one();
     a.how();
     a.what();
   }
}

one.java

 public interface three{
   void how();
 }

 public interface two{
        int i=2;
        void what();
 }

class one implements two,three{
   public void how(){
      System.out.println("\nHow! i = " + i);
     what();
   }

   public void what(){
      System.out.println("\nWhat! i = " + i);
   }

   public static void main(String args[]){
     one a = new one();
     a.how();
     a.what();
   }
}

输出如下所示

 What! i = 2

 How! i = 2

 What! i = 2

---

希望这将有助于解决您的问题。

您应该在外部创建接口，以便其他类可以访问它

interface three {
    void how();
}

interface two {
    int i = 2;

    void what();
}

public class one implements three, two {

    public void how() {
        System.out.println("\nHow! i = " + i);
        what();
    }

    public void what() {
        System.out.println("\nWhat! i = " + i);
    }

    public static void main(String args[]) {
        one a = new one();
        a.how();
        a.what();

    }
}

---

您始终可以通过

two.i

访问它。无论如何，你的方法似乎适合我在IntelliJ中使用。此外，像这样的嵌套接口可能会很复杂，并导致问题。