Small test for generic method to return parametrized type

GenericsTest.java

import java.util.HashMap;
import java.util.Map;

// http://stackoverflow.com/questions/3437897/how-to-get-a-class-instance-of-generics-type-t
public class GenericsTest {


    public static class MyClass extends Object {
    }


    private static <T> T create(Class<T> clazz) throws IllegalAccessException, InstantiationException {
        return clazz.newInstance();
    }

    private static void testCreationByClass() throws InstantiationException, IllegalAccessException {
        MyClass object = create(MyClass.class);
        System.out.println(object);                         // output: GenericsTest$MyClass@3764951d
        Integer integer = create(MyClass.class);            // compilation error: incompatible types: GenericsTest.MyClass cannot be converted to java.lang.Integer
    }


    private static <T> T create(String className) throws ClassNotFoundException, IllegalAccessException, InstantiationException {
        Class clazz = Class.forName(className);
        Object instance = clazz.newInstance();
        return (T) instance;
    }

    private static void testCreationByClassName() throws IllegalAccessException, InstantiationException, ClassNotFoundException {
        MyClass object = create(MyClass.class.getName());
        System.out.println(object);                         // output: GenericsTest$MyClass@4b1210ee
        Integer integer = create(MyClass.class.getName());  // runtime exception: java.lang.ClassCastException: GenericsTest$MyClass cannot be cast to java.lang.Integer
    }


    private static Map<String, Object> instances = new HashMap<String, Object>();
    static {
        instances.put("myClass", new MyClass());
        instances.put("string", "I'm string");
    }
    private static <T> T get(String key) {
        return (T) instances.get(key);
    }
    
    private static void testGenericGetter() {
        MyClass object = get("myClass");
        System.out.println(object);                         // output: GenericsTest$MyClass@4b1210ee
        String string = get("string");
        System.out.println(string);                         // output: I'm string
        Integer integer = get("myClass");                   // runtime exception: java.lang.ClassCastException: GenericsTest$MyClass cannot be cast to java.lang.Integer
    }


    public static void main(String[] args) throws Exception {
        testCreationByClass();
        testCreationByClassName();
        testGenericGetter();
    }

}