Test.java

public class Test {
    public void main(String[] args) {
        String className = "A";
        Class myClass = Class.forName(className);
        //Now need to make an object
        // This is a general Object type, must convert to call method.
        Object obj = myClass.newInstance(); 
        A aClass = (A) obj;
        //Shorter way
        A aClass = (A) Class.forName(className).newInstance();
    }
}