Examples of java.lang.reflect.ParameterizedType

java.lang.reflect.ParameterizedType
ParameterizedType represents a parameterized type such as Collection<String>.
A parameterized type is created the first time it is needed by a reflective method, as specified in this package. When a parameterized type p is created, the generic type declaration that p instantiates is resolved, and all type arguments of p are created recursively. See {@link java.lang.reflect.TypeVariable TypeVariable} for details on the creation process for typevariables. Repeated creation of a parameterized type has no effect.
Instances of classes that implement this interface must implement an equals() method that equates any two instances that share the same generic type declaration and have equal type parameters. @since 1.5

   {
      if (!MultivaluedMap.class.isAssignableFrom(type)) return false;
      if (genericType == null) return true;


      if (!(genericType instanceof ParameterizedType)) return false;
      ParameterizedType params = (ParameterizedType) genericType;
      if (params.getActualTypeArguments().length != 2) return false;
      return params.getActualTypeArguments()[0].equals(String.class) && params.getActualTypeArguments()[1].equals(String.class);
   }

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   {
      if (!MultivaluedMap.class.isAssignableFrom(type)) return false;
      if (genericType == null) return true;


      if (!(genericType instanceof ParameterizedType)) return false;
      ParameterizedType params = (ParameterizedType) genericType;
      if (params.getActualTypeArguments().length != 2) return false;
      return params.getActualTypeArguments()[0].equals(String.class) && params.getActualTypeArguments()[1].equals(String.class);
   }

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        }


        String elementType = null;
        if (genericType instanceof ParameterizedType)
        {
            ParameterizedType paramtype = (ParameterizedType)genericType;
            if (paramtype.getActualTypeArguments().length == 1)
            {
                if (paramtype.getActualTypeArguments()[0] instanceof Class)
                {
                    elementType = ((Class)paramtype.getActualTypeArguments()[0]).getName();
                }
            }
        }
        return elementType;
    }

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        }


        String elementType = null;
        if (method.getGenericReturnType() instanceof ParameterizedType)
        {
            ParameterizedType paramtype = (ParameterizedType)method.getGenericReturnType();
            if (paramtype.getActualTypeArguments().length == 1)
            {
                if (paramtype.getActualTypeArguments()[0] instanceof Class)
                {
                    elementType = ((Class)paramtype.getActualTypeArguments()[0]).getName();
                }
            }
        }
        return elementType;
    }

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        }


        String keyType = null;
        if (genericType instanceof ParameterizedType)
        {
            ParameterizedType paramtype = (ParameterizedType)genericType;
            if (paramtype.getActualTypeArguments().length == 2)
            {
                if (paramtype.getActualTypeArguments()[0] instanceof Class)
                {
                    keyType = ((Class)paramtype.getActualTypeArguments()[0]).getName();
                }
            }
        }
        return keyType;
    }

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        }


        String keyType = null;
        if (method.getGenericReturnType() instanceof ParameterizedType)
        {
            ParameterizedType paramtype = (ParameterizedType)method.getGenericReturnType();
            if (paramtype.getActualTypeArguments().length == 2)
            {
                if (paramtype.getActualTypeArguments()[0] instanceof Class)
                {
                    keyType = ((Class)paramtype.getActualTypeArguments()[0]).getName();
                }
            }
        }
        return keyType;
    }

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        }


        String valueType = null;
        if (genericType instanceof ParameterizedType)
        {
            ParameterizedType paramtype = (ParameterizedType)genericType;
            if (paramtype.getActualTypeArguments().length == 2)
            {
                if (paramtype.getActualTypeArguments()[1] instanceof Class)
                {
                    valueType = ((Class)paramtype.getActualTypeArguments()[1]).getName();
                }
            }
        }
        return valueType;
    }

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        }


        String valueType = null;
        if (method.getGenericReturnType() instanceof ParameterizedType)
        {
            ParameterizedType paramtype = (ParameterizedType)method.getGenericReturnType();
            if (paramtype.getActualTypeArguments().length == 2)
            {
                if (paramtype.getActualTypeArguments()[1] instanceof Class)
                {
                    valueType = ((Class)paramtype.getActualTypeArguments()[1]).getName();
                }
            }
        }
        return valueType;
    }

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  public static int getGenericlyTypeCount(Field field) {


    if (field.getGenericType() instanceof ParameterizedType) {


      ParameterizedType type = (ParameterizedType) field.getGenericType();


      return type.getActualTypeArguments().length;
    }


    return 0;
  }

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      {
         if (!List.class.isAssignableFrom(type))
            return false;
         if (!(genericType instanceof ParameterizedType))
            return false;
         ParameterizedType pt = (ParameterizedType) genericType;
         boolean result = pt.getActualTypeArguments()[0].equals(Float.class);
         System.out.println("FloatWriter result!!!: " + result);
         return result;
      }

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