Joachim Schaaf wrote:
> Steve Cohen wrote:
> >
> > I am getting my feet wet with java-linux.
> > As a first step, I am simply copying code from the disk included with
> > the book
> > "Java for C/C++ Programmers" by Michael C. DaConta.
> > The first "Hello World" program worked okay but the second one,
> > attached, does not.
> > On my RedHat 5.0 systems (yes, I've upgraded glibc and ld) the dialog
> > comes up but no keyboard input shows up. Any idea why?
>
> > // our book class
> > import book;
>
> I guess without this package (book) noone can compile it ...
>
> Joachim
> --
> Joachim Schaaf
> IoS - Gesellschaft fuer innovative Softwareentwicklung mbH
> Donatusstrasse 127-129, 50259 Pulheim, Tel/Fax: ++49-2234-986432/3
> Email: [EMAIL PROTECTED], WWW: http://www.ios-online.de/
Sorry about that. Okay, it's all there now. src1-7.java is a new version
incorporating Juergen Kreileder's code fix. It still doesn't work.
src1-4.java has the book class.
// gui classes
import java.awt.Frame;
import java.awt.TextField;
import java.awt.Panel;
import java.awt.Button;
import java.awt.GridLayout;
import java.awt.Event;
import java.awt.Color;
import java.awt.Label;
// our book class
import book;
// a utility class
import java.util.Vector;
class bookWindow extends Frame {
TextField title;
TextField author;
TextField publisher;
Vector theBooks;
int currentIdx;
bookWindow() {
super("Book Shelf");
// initialize the growable array
theBooks = new Vector(3);
currentIdx = 0;
Panel centerPanel = new Panel();
centerPanel.setLayout(new GridLayout(0, 2));
centerPanel.add(new Label(" Title"));
centerPanel.add(title = new TextField(20));
centerPanel.add(new Label(" Author"));
centerPanel.add(author = new TextField(20));
centerPanel.add(new Label(" Publisher"));
centerPanel.add(publisher = new TextField(20));
add("Center", centerPanel);
Panel bottomPanel = new Panel();
bottomPanel.add(new Button("store"));
bottomPanel.add(new Button("clear"));
bottomPanel.add(new Button("prev"));
bottomPanel.add(new Button("next"));
bottomPanel.add(new Button("exit"));
add("South", bottomPanel);
move(200, 100);
pack();
show();
}
public boolean handleEvent(Event evt) {
if (evt.id == Event.ACTION_EVENT)
{
if ("store".equals(evt.arg))
{
book aBook = new book(title.getText(),
author.getText(),
publisher.getText());
theBooks.addElement(aBook);
currentIdx = theBooks.size();
return true;
}
if ("clear".equals(evt.arg))
{
title.setText("");
author.setText("");
publisher.setText("");
return true;
}
if ("prev".equals(evt.arg))
{
if (currentIdx > 0)
{
book aBook = (book) theBooks.elementAt(--currentIdx);
title.setText(aBook.getTitle());
author.setText(aBook.getAuthor());
publisher.setText(aBook.getPublisher());
}
return true;
}
if ("next".equals(evt.arg))
{
if (currentIdx < (theBooks.size()-1))
{
book aBook = (book) theBooks.elementAt(++currentIdx);
title.setText(aBook.getTitle());
author.setText(aBook.getAuthor());
publisher.setText(aBook.getPublisher());
}
return true;
}
if ("exit".equals(evt.arg))
{
System.exit(0);
}
}
return super.handleEvent(evt);
}
}
class bookGUI {
public static void main(String args[])
{
new bookWindow();
}
}
// books.java
import java.lang.String;
import java.io.DataInputStream;
import java.lang.System;
import java.io.IOException;
class book {
protected String title;
protected String author;
protected String publisher;
book next;
book()
{
title = author = publisher = " ";
next = null;
}
book(book other)
{
title = other.title;
author = other.author;
publisher = other.publisher;
next = null;
}
book(String aTitle, String anAuthor, String aPublisher)
{
title = aTitle;
author = anAuthor;
publisher = aPublisher;
next = null;
}
void getBook()
{
try {
DataInputStream dis = new DataInputStream(System.in);
System.out.print("Enter title : ");
System.out.flush();
title = dis.readLine();
if (title.equals("done"))
return;
System.out.print("Enter author : ");
System.out.flush();
author = dis.readLine();
System.out.print("Enter publisher: ");
System.out.flush();
publisher = dis.readLine();
next = null;
} catch (IOException ioe)
{
System.out.println(ioe.toString());
System.out.println("Unable to get the book data.");
return;
}
}
void showBook()
{
System.out.println("Title : " + title);
System.out.println("Author : " + author);
System.out.println("Publisher: " + publisher);
}
// accessor
String getTitle() { return title; }
String getAuthor() { return author; }
String getPublisher() { return publisher; }
// mutator
void setTitle(String aTitle) { title = aTitle; }
void setAuthor(String anAuthor) { author = anAuthor; }
void setPublisher(String aPublisher) { publisher = aPublisher; }
}
