import javax.swing.JEditorPane;
import java.io.FileNotFoundException;
public class MessagePane extends JEditorPane{
public MessagePane(){
super("text/html","");
welcomeUser();
}
public void testProgress(){
try {
FriendLoader fl = new FriendLoader();
fl.setMessagePane(this);
Class friend = fl.getFriend();
String name = (String)friend.getMethod("getName",null).invoke
(friend.newInstance(),null);
if (name == null){
stringNotReturned();
} else greetFriend(name);
}
catch (NoSuchMethodException e) {
methodNotFound();
}
catch(ClassCastException e){
stringNotReturned();
}
catch (NullPointerException e){
classNotFound();
}
catch (Exception e){
e.printStackTrace();
unexpectedHappened();
}
}
private void welcomeUser(){
setText(" "+
" In this assignment you need to write the code to
" +
" make the following code compile and run:
"+
" Friend friend = new Friend();
"+
"String name = Friend.getName();
"+
" You will create a Friend class
" +
" that contains the method called above and returns
" +
" a value of the appropriate type.
"+
"Press the button below to check your progress"+
"");
}
private void greetFriend(String name){
setText(" "+
" Hello, " + name +".
" +
"Congratulations on solving your first
"+
"programming assignment." +
"");
}
void classNotFound(){
setText(" "+
" The first thing that the client class will do is to
" +
" construct a Friend class with the following code:
"+
" Friend friend = new Friend();
"+
" You will first need to create a Friend class.
" +
" Start by creating, saving, and compiling Friend.java
" +
" In the same directory as HelloWorld.jar.
"+
"The Template for this class is:
"+
"public class classname {}" +
"");
}
private void methodNotFound(){
setText(" "+
" Good job. You've now created the Friend class.
" +
"Once the client class has an instance of
" +
" the class Friend it will try to invoke the method
" +
" getName() with the following code.
"+
" String name = friend.getName();
"+
" You need to create a method in the Friend class.
" +
" - what type must the method return
" +
" - what is the method name and
" +
"- what parameters must the method take.
" +
"The template for a method that takes no parameter is:
"+
"public returnType methodname {}" +
"");
}
private void stringNotReturned(){
setText(" "+
" Your method must return a String.
" +
"Once the client class has an instance of
" +
" the class Friend it will try to invoke the method
" +
" getName() with the following code.
"+
" String name = friend.getName();
"+
" You need to create a method in the Friend class.
" +
" - what type must the method return
" +
" - what is the method name and
" +
"- what parameters must the method take.
" +
"The template for a method that takes no parameter is:
"+
"public returnType methodname {}" +
"");
}
private void unexpectedHappened(){ //...
}
}