Tanner

public class Test {
	public static void main(String[] args) {
		Test test = new Test();
	}
	
	public Test() {
		Corgi a = (Corgi)(new TeaCupCorgi()); // Compiles and Runs
		Corgi b = (TeaCupCorgi)(new Corgi()); // Compiles, but doesn't Run
		
		Corgi c = new Corgi(); // Compiles (this is the "new Corgi()" portion above on line 8)

Tanner

import java.awt.*;
import javax.swing.*;

public class Test extends JPanel {
	public Test() {
		setPreferredSize(new Dimension(400, 400));
	}
	
	public static void main(String[] args) {
		JFrame frame = new JFrame();