How i can start working with Java?

Right now i am having only 8 months of exp in ABAP. can any one help me out to start working with Java specially for Netweaver Purpose

It is great if you can get yourself familiar with java syntax, as is the case with any new langauage. However, the worst thing you can do is just code java in a top down approach. If you are not familiarizing yourself with OO concepts and best practices, then you are going to miss two important benefits that you will get from using OO programming - Reusability and flexibility in the frameworks that you develop (leveraging design patterns).
These benefits will also be directly obtainable when you use ABAP objects.
I am working in the opposite direction at the moment. I have some java experience, and I am starting to learn ABAP. I have used ABAP objects in my first project, and it was actually much better than I thought it would to be.
Java and OO programming will be an ongoing learning experience. You will not be an expert for quite some time. I do not consider myself to be an expert by any means, and I've be studying OO and java for a few years.
There is a fantastic book that explains OO concepts clearly, in much easier terms than the Gof "Design Patterns" book:
Java Design: Objects, UML, and Process by Kirk Knoernschild
You can read a few chapters at www.kirkk.com. (Use the JOUP link).
Hope this helps you.
- Brendan

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Hi everyone,
According to this page,
http://www.java2s.com/
There are heaps of technologies associated with Java.
As I am just a complete beginner, where do you think I should be starting with?
I am currently after a simple application with GUI, database
I think I should learn JSP afterwards, what is your opinion?
Thanks
Jack

Thanks guys for th replies.
Now I have the simple program working, so let's move on.
import java.awt.Button;
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.TextField;
import java.awt.Frame;
import java.awt.Font;
import java.awt.Label;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.FocusAdapter;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
class Quotation
String QuotationID;
String QuotationType;
Quotation()
String FindByQuotationNo(String Type)
if (Type == "Test") {
return "Q08011132";
return "Error";
public class TestSwing extends Frame
Button post = new Button("Find");
Label mouseLabel = new Label("");
Quotation quo = new Quotation();
TestSwing(String title)
super(title);
super.setSize(500,400);
mouseLabel.setFont(new Font("Arial", Font.BOLD, 20));
mouseLabel.setBackground(Color.PINK);
super.add(post, BorderLayout.NORTH);
super.addWindowListener(new MyWindowListener());
super.add(mouseLabel, BorderLayout.CENTER);
mouseLabel.addMouseListener(new MyMouseAdapter(mouseLabel));
public static void main(String[] args)
TestSwing demo = new TestSwing("Hello World");
demo.setVisible(true);
String QuoType = quo.FindByQuotationNo ("Test");
class MyAction implements ActionListener
private String name = null;
MyAction(String name)
this.name = name;
public void actionPerformed(ActionEvent e)
class MyWindowListener extends WindowAdapter
public void windowClosing(WindowEvent e)
System.exit(0);
class MyMouseAdapter extends MouseAdapter
private Label label = null;
MyMouseAdapter(Label label)
this.label = label;
public void mouseClicked(MouseEvent e)
int x = e.getX();
int y = e.getY();
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key = "left key";
else if (e.getButton() == e.BUTTON3)
key = "right key";
label.setText ("X-" + x + "Y-" + y + "," +key);
With the above snippet, I wonder how can you connect "FindByQuotationType" to the main class
///// Error
C:\JavaTest>javac TestSwing.java
TestSwing.java:72: non-static variable quo cannot be referenced from a static co
ntext
String QuoType = quo.FindByQuotationNo ("Test");
^
1 error

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I read a similar answer in this Forum but I couldn't find good results.
I'm using Solaris SPARC and JDK 1.3. When I run the Web server I Find these messages:
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Thank you
P.D. The Classpath already contains the Java Bean file.

Hola Daniel,
Make this simple thing, import the class in your jsp, for example, in your case this should be:
<%@ page import="UserData" %>
The jasper compiler assumes that any unqualified class is part of the package jsps. I think this is to allow class definitions in the jsps. So if you indicate that the class is not packaged in jsps it will be found.
Juan

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