java - 有一个函数依赖于 Java 中未指定的类

Question

如何在 Java 中实现以下伪代码:

  class A extends B{
    int var[];
   void someFn(var, WANT TO INPUT EITHER a C1 or C2 CLASS HERE){
           //initialize var;
           // Call fn(var,C1 or C2)

    public static void main(String[] arguments){
     ///main stuff
    }

   }

  class B{
     void fn(int var[], C1 c1){return foo;}
     void fn(int var[], C2 c2){return other foo;}
    }
  class C1{stuff here}
  class C2{other stuff here}

我试过了

  class A extends B{
    int var[];
     public static <C> void someFn(var, C Cclass){
        //initialize var;
        // Call fn(var, C1 or C2)

但这并没有奏效。我还是 Java 的新手。我宁愿不重载 someFn

Answer 1

现在这只是伪代码的实现

package com.so;

public class A extends B{
     int var[];
     void someFn(int[] var, Object object){
         this.var = var;
         if (object instanceof C1){
             fn(var,(C1) object);    
         }
         else if (object instanceof C2){
             fn(var,(C2) object);    
         }


     }

     public static void main(String[] arguments){
         A a = new A();
         int[] i = {1,2};
         C1 c1 = new C1();
         a.someFn(i, c1);
        }

}

class B{
      void fn(int var[], C1 c1){
          System.out.println("C1 func");
          /*Void can not return even foo*/
          }
      void fn(int var[], C2 c2){
          System.out.println("C2 func");
          /*Void can not return even other foo either*/
          }
}

class C1{}
class C2{}

---

使用泛型

public class A<T> extends B<T>{
     int var[];
     void someFn(int[] var, T t){
         this.var = var;
         fn(var,t);


     }

     public static void main(String[] arguments){
         A<C1> a = new A<C1>();
         int[] i = {1,2};
         C1 c1 = new C1();
         a.someFn(i, c1);

         C2 c2 = new C2();
         //a.someFn(i, c2); //This will give you complie time error because of typesafety (good thing)

         A<C2> a2 = new A<C2>();
         a2.someFn(i, c2);
        }

}

class B<T>{
      void fn(int var[], T c){
          System.out.println(c.getClass().getName() +"func");
          /*Void can not return even foo*/
          }

}

class C1{}
class C2{}