Class generic problem

For example: I have a class Abc
There is a Map, Map > mapping = new HashMap > ; ( ) ;

Class c = Class.forName (className) ;

if className The class is inherited Abc , it will execute the code below
mapping.put ("xxx", c); / / here is the problem

do not know if people understand what I mean, of course , if not generic , then it is not so much "dust " of the
------ Solution ---------- ----------------------------------

Since generics compile inspection , if without the usual cast with such wording is not compile the . We can use java generics only done at compile time checking features as long as we let the compiler can not check on the line, this time without a strong turn uses reflection to call put the best.

  package test;
  
  import java.lang.reflect.Method;
  import java.util.HashMap;
  import java.util.Map;
  
  public class Test {
  
  	public static void main(String[] args) throws ClassNotFoundException {
  
  		Map<String, Class<Test>> mapping = new HashMap<String, Class<Test>>();
  
  		String className = "xxx.xxx.xxx"; // 这里具体是什么并不重要
  
  		Class<?> c = Class.forName(className);
  
  		Method method=Map.class.getMethod("put",Object.class,Object.class);
                  method.invoke(mapping,"a",c);
                  System.out.println(mapping);
  	}
  }
  

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One might argue that such a solution
map.put ("xxx", (Class) c );

But the problem is "(Class ) c", forced conversion, it's not back to the way the non-generic ?
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did not understand what mean.
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> represents a generic , generic to Abc this subclass or for itself (Abc) type.
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public class TestG {

Map map = new HashMap ();

so can not it
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  package test;
  
  import java.util.HashMap;
  import java.util.Map;
  
  public class Test {
  
  	public static void main(String[] args) throws ClassNotFoundException {
  
  		Map<String, Class<Test>> mapping = new HashMap<String, Class<Test>>();
  
  		String className = "xxx.xxx.xxx"; // 这里具体是什么并不重要
  
  		Class<?> c = Class.forName(className);
  
  		mapping.put("a", c);
  	}
  }
  

Finally mapping.put compile errors , how to adjust, do not use cast
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here to do a display conversion
if (c instance of Class ) {
Class abcC = (Class ) c ;
mapping.put ("xxx", abcC);
}