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Java: a validated class instance using reflection

I am trying to use one of the simplest forms of reflection to instantiate a class:

package some.common.prefix;

public interface My {
    void configure(...);
    void process(...);
}

public class MyExample implements My {
    ... // proper implementation
}

String myClassName = "MyExample"; // read from an external file in reality

Class<? extends My> myClass =
    (Class<? extends My>) Class.forName("some.common.prefix." + myClassName);
My my = myClass.newInstance();

Specifying an unknown class object obtained from Class.forNamegives a warning:

Type safety: Unchecked cast from Class <capture # 1-of?> To Class <? extends My>

I tried using the instanceofcheck approach :

Class<?> loadedClass = Class.forName("some.common.prefix." + myClassName);
if (myClass instanceof Class<? extends RST>) {
    Class<? extends My> myClass = (Class<? extends My>) loadedClass;
    My my = myClass.newInstance();
} else {
    throw ... // some awful exception
}

but this leads to a compilation error: Cannot perform instanceof check against parameterized type Class<? extends My>. Use the form Class<?> instead since further generic type information will be erased at runtime.So, I can not use the approach instanceof.

How do I get rid of it and how should I do it right? Can reflection be used without these warnings (i.e., do not ignore or suppress them)?

+5
3

:

/**
 * Create a new instance of the given class.
 * 
 * @param <T>
 *            target type
 * @param type
 *            the target type
 * @param className
 *            the class to create an instance of
 * @return the new instance
 * @throws ClassNotFoundException
 * @throws IllegalAccessException
 * @throws InstantiationException
 */
public static <T> T newInstance(Class<? extends T> type, String className) throws
        ClassNotFoundException,
        InstantiationException,
        IllegalAccessException {
    Class<?> clazz = Class.forName(className);
    Class<? extends T> targetClass = clazz.asSubclass(type);
    T result = targetClass.newInstance();
    return result;
}


My my = newInstance(My.class, "some.common.prefix.MyClass");
+5

, :

Class<? extends My> myClass= null;
Class<?> loadedClass = Class.forName("some.common.prefix." + myClassName);
if(My.class.isAssignableFrom(loadedClass))
{
    myClass = loadedClass.asSubclass(My.class);
}
My my = myClass.newInstance();
+4

Take a look at this question. How can I clear warnings without warning? . I have found that when it comes to reflection, it’s best for you to use responsibly@SuppressWarnings("unchecked")

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