Studying from Head First Java (2nd Ed.)

[Bryce Monaco]

So I have literally just started reading the book, and I am stuck at the first lesson. The lesson has you create a small applet (if that's the right term) that acts as a party invitation. The problem that I am having is that the compiler is returning 'Symbol Not Found Error' on things such as capital letters, and even periods.

My code (copied directly from the book, line for line)

import java.awt;

import java.awt.event;

class Party {
	public void buildInvite(){
		Frame f = new Frame();
		Label l = new Label("Party at Tim's");
		Button b = new Button("You bet");
		Button c = new Button("Shoot me");
		Panel p = new Panel();
		p.add(l);
		} //more code here...
	}
	

And the compiling error

Party.java:1: error: cannot find symbol
import java.awt;
           ^
  symbol:   class awt
  location: package java
Party.java:3: error: cannot find symbol
import java.awt.event;
               ^
  symbol:   class event
  location: package java.awt
Party.java:7: error: cannot find symbol
                Frame f = new Frame();
                ^
  symbol:   class Frame
  location: class Party
Party.java:7: error: cannot find symbol
                Frame f = new Frame();
                              ^
  symbol:   class Frame
  location: class Party
Party.java:8: error: cannot find symbol
                Label l = new Label("Party at Tim's");
                ^
  symbol:   class label
  location: class Party
Party.java:8: error: cannot find symbol
                label l = new Label("Party at Tim's");
                              ^
  symbol:   class Label
  location: class Party
Party.java:9: error: cannot find symbol
                Button b = new Button("You bet");
                ^
  symbol:   class button
  location: class Party
Party.java:9: error: cannot find symbol
                button b = new Button("You bet");
                               ^
  symbol:   class Button
  location: class Party
Party.java:10: error: cannot find symbol
                Button c = new Button("Shoot me");
                ^
  symbol:   class button
  location: class Party
Party.java:10: error: cannot find symbol
                button c = new Button("Shoot me");
                               ^
  symbol:   class Button
  location: class Party
Party.java:11: error: cannot find symbol
                Panel p = new Panel();
                ^
  symbol:   class panel
  location: class Party
Party.java:11: error: cannot find symbol
                panel p = new Panel();
                              ^
  symbol:   class Panel
  location: class Party
12 errors

If someone could explain what is happening (with some detail, I'm a beginner remember ;) ) and what I could do to fix it, I would greatly appreciate it.

[Rameshwar Soni]

Bryce, Welcome to Ranch

You have imported the packages incorrectly. It should have been

import java.awt.*;
import java.awt.event.*;

As you can see the * which means you are importing all the classes from the awt and event package.

If you need to import only a single class from a package then it would be written like this

import java.awt.Frame;

Here only the Frame class would be imported from awt package

[Campbell Ritchie]

Welcome to the Ranch

Beware of the Party example from HFJ; it is incomplete and cannot be executed in its current form. It is usually considered better form to list all the classes you are importing, even if you have several lines starting
import foo.bar.…