import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class JavaMainClass {

	private static AbstractClass obj;
	private static String className;

	public static void main (String args[]) throws IOException {

		/******************************************* ABSTRACT CLASS RUN IN JAVA ***************************************** START **************/

		//Open stream to input details from users
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		//Input child class name to extend (Input AbstractClassChild1 , as that is the only class extending the AbstractClass for now)
		System.out.println("Please enter the class name to instantiate: ");
		className = br.readLine();

		System.out.print("The class name enetered is: ");
		System.out.println(className);

		//instantiate the child class entered by user
		try {
			//Instantiate the child class
			//obj = new AbstractClassChild1();
			obj = (AbstractClass) Class.forName(className).newInstance();
			obj.add(3, 2);
			obj.subtract(3, 2);

			//Call method introduce of child class (if the method is overridden in the child class, then it would never call the method of the parent or abstract class)
			obj.introduce();

			//Call constructor of child class (it does not get called by newinstance(). Contructors can even have params below
			try {
				Class.forName(className).getConstructor();
			} catch (NoSuchMethodException e) {
				e.printStackTrace();
			} catch (SecurityException e) {
				e.printStackTrace();
			}

		} catch (InstantiationException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}

		/******************************************* ABSTRACT CLASS RUN IN JAVA ***************************************** END ****************/

}