When I issue the DOS command, java buttonDir, to try to run a java program, I get the error message, "Exception in thread "Main" Java.Lang.NoClassDefFoundError: buttonDir. I would like to know why and the way to solve it. The source code of the program is the following: import java.awt.*; import java.applet.Applet; public class buttonDir extends Applet { public void init() { setLayout(new BorderLayout()); add("North", new Button("North")); add("South", new Button("South")); add("East", new Button("East")); add("West", new Button("West")); add("Center", new Button(&q   More>>

			

			import java.awt.*;
			

			import java.applet.Applet;
			

			

			public class buttonDir extends Applet {
			

			public void init() {
			

			setLayout(new BorderLayout());
			

			add("North", new Button("North"));
			

			add("South", new Button("South"));
			

			add("East", new Button("East"));
			

			add("West", new Button("West"));
			

			add("Center", new Button("Center"));
			

			}
			

			}