Tricky Java Generics：使用泛型方法实现非泛型接口的泛型类(Tricky Java Generics : generic class implementing non generic interface with generic Method)

 我在ideone.com中看到以下代码： 
 
import java.util.*;

class Test{
   interface Visitor{
        public <T> void visit(T Value);
   }

   class MyVisitor<T> implements Visitor{
        List<T> list = new  ArrayList<T>();

        public <T> void visit(T value){
           list.add(value);
        }
    }
}
 
 编译时，此代码将产生以下+错误： 
 
 Main.java:12: error: no suitable method found for add(T#1)
             list.add(value);
                 ^
     method List.add(int,T#2) is not applicable
       (actual and formal argument lists differ in length)
     method List.add(T#2) is not applicable
       (actual argument T#1 cannot be converted to T#2 by method invocation conversion)   where T#1,T#2 are type-variables:
     T#1 extends Object declared in method visit(T#1)
     T#2 extends Object declared in class Test.MyVisitor 1 error
 
 问题是访问中的类型 T在列表中不被视为相同的T. 我该如何解决这个编译问题？ 

I have the following code as seen in ideone.com:
 
import java.util.*;

class Test{
   interface Visitor{
        public <T> void visit(T Value);
   }

   class MyVisitor<T> implements Visitor{
        List<T> list = new  ArrayList<T>();

        public <T> void visit(T value){
           list.add(value);
        }
    }
}
 
When compiled this code will produce the following+ error:
 
 Main.java:12: error: no suitable method found for add(T#1)
             list.add(value);
                 ^
     method List.add(int,T#2) is not applicable
       (actual and formal argument lists differ in length)
     method List.add(T#2) is not applicable
       (actual argument T#1 cannot be converted to T#2 by method invocation conversion)   where T#1,T#2 are type-variables:
     T#1 extends Object declared in method visit(T#1)
     T#2 extends Object declared in class Test.MyVisitor 1 error
 
The problem is that the type T in visit is not considered the same  T in list . How can I fix this compilation problem?

原文：https://stackoverflow.com/questions/15947506