public class HelloWorld{
public static void main(String args[]){
Greet
msg=new Greet();
System.out.println(msg.getMessage());
System.out.println(msg.getThankYou());
msg.getMyMessage();
}
}
public class Greet extends Message{
private String msg=new String("Computer Science - ");
public Greet(){
super();
}
public String getMessage(){
return msg+getWord();
}
}
public class Message extends Goodbye implements Welcome {
private String word;
public Message(){
System.out.println("Did you
just call me?");
word="Hello World";
}
public final String getWord(){ //try to override this in message
return word;
}
public void greetMe(String m){
System.out.println("Welcome to my
application");
}
public String getThankYou() {
return thanks;
}
}
public abstract class Goodbye{
protected String thanks="Thank you for
visiting us";
public abstract String getThankYou();
public void getMyMessage(){
System.out.println("This is from
the abstract class");
}
}
public interface Welcome{
void greetMe(String m);
//only default and public class modifier can be used
//try to copy a method with body - fail
}
