Experience in Java but lack of knowledge .. Help will be appriciated...
Hello All,
My question is regarding my career which I know you guru's can help me with. I am working as Java programmer in company from past two years. My Company tune up a software which is basically a off the shelf quality management software developed in US. Tune up means write small Java code snippets and make it working for a client.
After working in this company I felt I don't do much java programming. When I look at the IT Job market, there are thousands of people out there much better and more advanced then me. I am lack of practice in developing programs. I am preparing for my SCWCD, but I dont know where I can practice these concepts.
I want to know how you Guru's manage to practice and learn. Is there any better way I can learn and practice at the same time. Please do help because I feel I am loosing the confidence in myself.
Thanks in advance... Thanks a lot...
Skotty wrote:
In my 10+ years of experience, I've rarely ever learned anything from company training, coworkers, or mentors (which generally don't exist).O_o
I expect everyone, regardless of knowledge, to be able to learn something from coworkers or mentors.
Nor have I learned anything from collaborating with others on hobby projects, as I can never find anyone to collaborate with who is of similar skill (no one wants to be my tutor, nor do I want to tutor others). Joining an open source project is a possibility if you can find one that interests you, that you feel you can make a positive contribution to, and that you can commit to. Though I have never ran into that situation either. Most other developers are either new to Java, not really interested in Java or programming (the type that just does it as a job), highly reclusive, or less interested in collaborating or helping than in attempting to demonstrate their superior intellect.I don't think that that is true for open source developers.
>
I've learned pretty much everything I know from books, a few online resources, and just writing my own programs by myself. I'd say that's your best bet.That is a good choice, but you can also learn bad habits if you don't have anyone to learn from and if no one is reading your code.
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At a dead end. A java student in need of help.
I've hit a wall.
The program is supposed to allow the user to draw five different polygons using the polygon class and let the user pick the color for each polygon and move each polygon around the screen once it is filled in. The user clicks to add the points and then double clicks to fill in the polygon. Then the polygon is added to the array. Up to the dragging around the screen the program works fine. When I click on a polygon with the shift down nothing happens and I've spent several hours trying to figure out why.
I've placed several System.out.println's in the code and I think I've narrowed down the problem. (I hope) I think it might have something to do with the canvas repainting. Because the S.O.P's show that the program is going through and executing that code. It might also have something to the do with my polygon array, but to my knowledge that is setup fine.
Thanks a bunch if you try to help.
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// Full Code Below
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class poly extends JFrame implements ActionListener
/* Accessible Variables */
private JPanel canvas;
private JPanel mp;
private JComboBox choice;
private JButton reset;
private Podly polyArray[] = new Podly[5];
private Podly currentPoly = new Podly();
private Podly movingPoly = new Podly();
private int count;
private Color currentColor;
private Point firstPoint;
private boolean newPoly = true;
private boolean moving = false;
private boolean overflowed = false;
poly()
setTitle("Polygon");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
count = 0;
/* Interactive Buttons and Menus */
JMenuBar tp = new JMenuBar();
JMenu color = new JMenu("Color");
JMenuItem MBlack = new JMenuItem("Black");
color.add(MBlack);
JMenuItem MRed = new JMenuItem("Red");
color.add(MRed);
JMenuItem MGreen = new JMenuItem("Green");
color.add(MGreen);
JMenuItem MYellow = new JMenuItem("Yellow");
color.add(MYellow);
MBlack.addActionListener(this);
MRed.addActionListener(this);
MGreen.addActionListener(this);
MYellow.addActionListener(this);
tp.add(color);
canvas = new CanvasArt();
canvas.setBackground(Color.white);
canvas.addMouseListener(new Points());
canvas.addMouseMotionListener(new Moved());
choice = new JComboBox();
choice.addItem("Black");
choice.addItem("Red");
choice.addItem("Green");
choice.addItem("Yellow");
choice.addActionListener(this);
reset = new JButton("Reset");
reset.addActionListener(this);
JLabel chooseColor = new JLabel("Choose a color:");
JLabel holdShift = new JLabel("Hold shift, click, and drag to move a polygon.");
mp = new JPanel();
mp.add(chooseColor);
mp.add(choice);
mp.add(reset);
mp.add(holdShift);
setJMenuBar(tp);
getContentPane().add(canvas);
getContentPane().add(mp, "South");
public static void main(String [] args)
JFrame main = new poly();
main.setSize(600, 600);
main.setVisible(true);
public void actionPerformed(ActionEvent e)
Object test = e.getSource();
Object selection;
if (test instanceof JComboBox)
JComboBox source = (JComboBox)e.getSource();
selection = source.getSelectedItem();
if (selection.equals("Black")) currentColor = Color.black;
else if (selection.equals("Red")) currentColor = Color.red;
else if (selection.equals("Green")) currentColor = Color.green;
else if (selection.equals("Yellow")) currentColor = Color.yellow;
else if (test instanceof JButton) // Repaints if Reset Button is Pressed
repaint();
currentPoly.reset();
count = 0;
overflowed = false;
else
JMenuItem source = (JMenuItem)e.getSource();
selection = source.getText();
if (selection.equals("Black")) currentColor = Color.black;
else if (selection.equals("Red")) currentColor = Color.red;
else if (selection.equals("Green")) currentColor = Color.green;
else if (selection.equals("Yellow")) currentColor = Color.yellow;
class Podly extends Polygon // Class adds Color Fuctionality to Polygon class
Color polyColor;
void setColor(Color y)
{polyColor = y;}
Color getColor()
{return polyColor;}
/* Canvas Painting Panel */
class CanvasArt extends JPanel
public void paintComponent(Graphics g)
super.paintComponent(g);
System.out.println("Canvas is called");
System.out.println(polyArray);
for (int i=0; i>count;i++)
System.out.println("Loop is going");
Podly y = polyArray;
g.setColor(y.getColor());
g.fillPolygon(y);
System.out.println(y);
System.out.println("Loop has filled in polygon"); // Test
System.out.println("painting complete");
class Points extends MouseAdapter
public void mousePressed(MouseEvent e)
Graphics g = canvas.getGraphics();
if (overflowed) // Checks for overflow in program.
g.setColor(Color.RED);
Font font = new Font("SansSerif",Font.BOLD, 30);
g.setFont(font);
g.drawString("OVERFLOW", 10, 30);
Font font2 = new Font("SansSerif",Font.BOLD, 20);
g.setFont(font2);
g.setColor(Color.BLUE);
g.drawString("Double Click to Play Again", 10, 50);
if (e.getClickCount() == 2) // Allows user to play again.
repaint();
currentPoly.reset();
count = 0;
overflowed = false;
else
int x = e.getX();
int y = e.getY();
if (newPoly)
firstPoint = new Point(x,y);
if (e.isShiftDown())
System.out.println("Gets before Check loop");
for (int r=count-1;r>=0;r--)
System.out.println("Inside For Check Loop");
System.out.println(polyArray[r]);
if (!polyArray[r].contains(x,y))
System.out.println("Point is found");
movingPoly = polyArray[r];
System.out.println("MovingPoly Defined");
moving = true;
System.out.println("Moving is true"); // test
break;
else
currentPoly.setColor(currentColor);
currentPoly.addPoint(x,y);
g.fillOval(x,y,1,1);
newPoly = false;
else
if (e.getClickCount() == 2)
g.setColor(currentPoly.getColor());
g.fillPolygon(currentPoly);
polyArray[count] = currentPoly;
currentPoly.reset();
count++;
if (count == polyArray.length)
{overflowed = true;}
newPoly = true;
else
g.setColor(currentPoly.getColor());
currentPoly.addPoint(x,y);
g.drawLine(firstPoint.x, firstPoint.y, x, y);
firstPoint.move(x,y);
public void mouseReleased(MouseEvent e)
if(e.isShiftDown())
{ moving = false; }
class Moved extends MouseMotionAdapter
public void mouseDragged(MouseEvent e)
if (moving && e.isShiftDown())
int x = e.getX();
int y = e.getY();
System.out.println("Gets here");
movingPoly.translate((x-firstPoint.x),(y-firstPoint.y));
firstPoint.move(x,y);
canvas.repaint();Here is the updated code still with the color error I talked about above.
:) Thanks for all the help everyone.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class poly extends JFrame implements ActionListener
/* Accessible Variables */
private JPanel canvas;
private JPanel mp;
private JComboBox choice;
Podly [] polyArray;
private Podly currentPoly;
private Podly movingPoly;
private int count;
private Color currentColor;
private Point firstPoint;
private Color polyColor;
private boolean newPoly = true;
private boolean moving = false;
private boolean overflowed = false;
poly()
setTitle("Polygon");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Exits program on window close.
polyArray = new Podly[5];
count = 0; // Set count to zero.
/* Interactive Buttons and Menus */
JMenuBar tp = new JMenuBar();
JMenu color = new JMenu("Color");
JMenuItem MBlack = new JMenuItem("Black");
color.add(MBlack);
JMenuItem MRed = new JMenuItem("Red");
color.add(MRed);
JMenuItem MGreen = new JMenuItem("Green");
color.add(MGreen);
JMenuItem MYellow = new JMenuItem("Yellow");
color.add(MYellow);
MBlack.addActionListener(this);
MRed.addActionListener(this);
MGreen.addActionListener(this);
MYellow.addActionListener(this);
tp.add(color);
canvas = new CanvasArt();
canvas.setBackground(Color.white);
canvas.addMouseListener(new Points());
canvas.addMouseMotionListener(new Moved());
choice = new JComboBox();
choice.addItem("Black");
choice.addItem("Red");
choice.addItem("Green");
choice.addItem("Yellow");
choice.addActionListener(this);
JLabel chooseColor = new JLabel("Choose a color:");
JLabel holdShift = new JLabel("Hold shift, click, and drag to move a polygon.");
mp = new JPanel();
mp.add(chooseColor);
mp.add(choice);
mp.add(holdShift);
setJMenuBar(tp);
getContentPane().add(canvas);
getContentPane().add(mp, "South");
/* Button Listeners */
public void actionPerformed(ActionEvent e)
Object test = e.getSource();
Object selection;
if (test instanceof JComboBox)
JComboBox source = (JComboBox)e.getSource();
selection = source.getSelectedItem();
if (selection.equals("Black")) currentColor = Color.black;
else if (selection.equals("Red")) currentColor = Color.red;
else if (selection.equals("Green")) currentColor = Color.green;
else if (selection.equals("Yellow")) currentColor = Color.yellow;
else
JMenuItem source = (JMenuItem)e.getSource();
selection = source.getText();
if (selection.equals("Black")) currentColor = Color.black;
else if (selection.equals("Red")) currentColor = Color.red;
else if (selection.equals("Green")) currentColor = Color.green;
else if (selection.equals("Yellow")) currentColor = Color.yellow;
class Podly extends Polygon // Class adds Color Fuctionality to Polygon class
void setColor(Color y) // sets the Polygon's color.
{polyColor = y;}
Color getColor() // returns the Polygon's color.
{return polyColor;}
/* Canvas Painting Panel */
class CanvasArt extends JPanel
public void paintComponent(Graphics g)
super.paintComponent(g);
for (int i=0; i<count;i++)
g.setColor(polyArray.getColor());
g.fillPolygon(polyArray[i]);
class Points extends MouseAdapter
/* Listens for mouse press, constructs polygons, stores them in array. */
public void mousePressed(MouseEvent e)
Graphics g = canvas.getGraphics();
if (overflowed) // Checks for overflow in program.
g.setColor(Color.RED);
Font font = new Font("SansSerif",Font.BOLD, 30);
g.setFont(font);
g.drawString("OVERFLOW", 10, 30);
Font font2 = new Font("SansSerif",Font.BOLD, 20);
g.setFont(font2);
g.setColor(Color.BLUE);
g.drawString("Double Click to Play Again", 10, 50);
if (e.getClickCount() == 2) // allows user to play again by resetting.
repaint();
count = 0;
overflowed = false;
else
int x = e.getX();
int y = e.getY();
if (newPoly)
firstPoint = new Point(x,y);
if (e.isShiftDown())
for (int r=count-1;r>=0;r--)
if (polyArray[r].contains(x,y))
movingPoly = polyArray[r];
moving = true;
break; // exits for loop after Polygon with point is found.
else
currentPoly = new Podly();
currentPoly.addPoint(x,y); // Adds the first point.
currentPoly.setColor(currentColor); // Sets the Polygon Color
g.fillOval(x,y,1,1);
newPoly = false;
else
/* Close the current Polygon at double click,
* then moves on to the next. */
if (e.getClickCount() == 2)
g.setColor(currentPoly.getColor());
g.fillPolygon(currentPoly);
polyArray[count] = currentPoly;
count++;
if (count == polyArray.length)
{overflowed = true; canvas.repaint();}
newPoly = true;
else
g.setColor(currentPoly.getColor());
currentPoly.addPoint(x,y);
g.drawLine(firstPoint.x, firstPoint.y, x, y);
firstPoint.move(x,y);
/* Listens for mouse release */
public void mouseReleased(MouseEvent e)
if(e.isShiftDown())
{ moving = false; }
/* Moves selected Polygon around */
class Moved extends MouseMotionAdapter
public void mouseDragged(MouseEvent e)
if (moving && e.isShiftDown())
int x = e.getX();
int y = e.getY();
movingPoly.translate((x-firstPoint.x),(y-firstPoint.y));
firstPoint.move(x,y);
canvas.repaint();
public static void main(String [] args)
JFrame poly = new poly();
poly.setSize(600, 600);
poly.setVisible(true); -
sir i have given lot of effort but i am not able to solve my problem either with notifiers or with occurence fn,probably i do not know how to use these synchronisation tools.
sir i am using datasocket read ,i am communicating with java but my problem is that bcz im using while loop to see if value has changed my labview consumes all the processors time ,sir i want a event like thing so that while loop is not in continuous loopHi Sam,
I want to pass along a couple of tips that will get you more and better response on this list.
1) There is an un-written rule that says more "stars" is better than just one star. Giving a one star rating will probably eliminate that responder from individuals that are willing to anser your question.
2) If someone gives you an answer that meets your needs, reply to that answer and say that it worked.
3) If someone suggests that you look at an example, DO IT! LV comes with a wonderful set of examples that demonstate almost all of the core functionality of LV. Familiarity with all of the LV examples will get you through about 80% of the Certified LabVIEW Developer exam.
4) If you have a question first search the examples for something tha
t may help you. If you can not find an example that is exactly what you want, find one that is close and post a question along the lines of "I want to do something similar to example X, how can I modify it to do Y".
5) Some of the greatest LabVIEW minds offer there services and advice for free on this exchange. If you treat them good, they can get you through almost every challenge that can be encountered in LV.
6) If English is not your native language, post your question in the language you favor. There is probably someone around that can help. "We're big, we're bad, we're international!"
Trying to help,
Welcome to the forum!
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
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Java Plug-In's SSV Helper 2, Start Detector - are not Verified
I have the following Internet Explorer Add-ons relating to Java...
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BUT, it was a great OOP training experience. Anyhow,
needless to day Java is miles ahead on all fronts.Small world. I was stuck in the old DataFlex Ver 2.3 at that time. The company I worked for had the newer OOP package. I did get to work with it some, but not enough to become totally familiar with it. We started to move out of DataFlex towards PowerBuilder towards the end of 1995. I did get some OOP from that experience, but again only enough to learn about global variables, instance variables, and a few other items. I hoping that I will be able to get the solid OOP background that I need from JAVA since I hear through the grapevine that it may be a new tool that we will be looking at to enhance our programming. I was looking at PERL but even the PERL programmers we have agree that JAVA is more scalable. -
I would like to embed interactive widgets in iBooks using iBookAuthor. The widgets in question started life in Java but GWT has allowed them to be converted to javascript and to run on web pages (for example, http://softoption.us/content/node/437 scroll to the bottom). In theory, iBookAuthor can bring in most html5, and much javascript. The technique is to wrap the html in a folder, with 2 extra files, a plist and a default png and then change the extension of the folder to ‘.wdgt’. This is the technique for making Dashboard widgets for the Mac, and Apple even have the Dashcode software to do it. So what you really do is to make a Dashboard widget, then iBookAuthor can import it. So far, so good. And some folk have been doing this, for example http://www.prweb.com/releases/2012/2/prweb9242432.htm http://www.panophoto.org/forums/viewtopic.php?f=64&t=10417&p=158330#p158423 However, if you start with GWT and create a single page with one button and a Hello World, compile it, and get the WAR file (I use Eclipse here)… the Safari browser and others will run it properly (even on an iPad). Then if you wrap it, a proper Dashboard widget is created, which runs properly on a Mac. Then if you go to iBookAuthor and put a custom widget in the Text, then drag it in. It is accepted by the text and shown as being there. However, if you use Preview to look at it on an iPad, it is gone (or was never there in the first place). Anyone any ideas on this? [And iBook Author seems to give no warnings.] The widget is at https://dl.dropbox.com/u/46713473/Test6.wdgt.zip I have bells and whistles that I’d like to get into an iBook!
Thanks for any insights.
MartinI do have a little to add, which might help someone. Indeed, opening a blank page and dragging the widget straight in seems good in difficult cases. But, actually, I was also able to insert successfully from the Toolbar especially to blank pages. So, it may have been something to do with the columns and stuff like that. Anyway back then the insertion would show in iBooks Author but not in the Preview on the iPad. I moved on to actual Google Web Toolkit output javascript. Basically I had three at hand to try: a Hello World with a button which went straight it, one of moderate complexity, (for example with a built in Lisp interpreter), which also went straight in, and finally a more complex one that initially was rejected by iBook Author. Author complained that there was an unsupported media file (of course, Author does not tell you which one it is, that would be too easy). [Remember, this was a proper working Dashboard widget which could be installed on a Mac]. Among other things I had read remarks about .gif files. When looking through the GWT war directory at the actual javascript etc files, I noticed there were two gifs there one called ‘clear.cache.gif ‘ and a second one called ‘0F89659FF3F324AE4116F700257E32BD.cache.gif’. (Now, there is obfuscation so the numbers here may be different from case to case.) The clear.cache.gif did not seem to be anything special. But the other one is an animation. It is three little boxes that twinkle (rather like a waiting spinning cursor). So, I opened that file and saved it to itself (that picks the top frame of the animation and saves only that, leaving you with an unanimated gif). The resulting widget drags and drops into iBooks Author (and seems to work properly at a quick glance). So, if you are having trouble with ‘unsupported media files’ converting animated gifs into unanimated gifs might help in some cases.
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Java programming applet issue newbie help
hello
i am a student taking an intro to OOP course using java. i have textMate and blue J as java editing environments. i have successfully managed a few lessons but now i am having trouble with applets. my applet source code will run in blue j but not in textmate and i think the reason has to do with the applet extension. first when i run the program successfully in blue jay it utilizes the sun.applet.main environment to display the applets output. but in textmate the identical code generates an error which i finally have a some information about why?
the error in textmate reads
:exception in thread "main" java.lang.NoSuchMethodError: main
i am not sure whether this has to do with the import java.awt.*: or just the public void paint(Graphics g) method (code Below)
the eventual intended output of the applet is to a web browser via an html document which calls the java applet but when i run this html document both firefox and safari display blank pages.
i am on macpro with the latest java version - just downloaded last week
is there some unique import statement to utilize import java.awt.*;
import java.applet.*; in mac os or ???
BTW the smile.gif is in the project folder with the java document
thanks for any help
Chapter 2: Welcome to My Day
Programmer: rafe McDonald
Date: November 5, 2009
Filename: WelcomeApplet
Purpose: This project displays a smile graphic, welcome message, the user's
name, and the system date in an applet.
import java.util.Date;
import java.awt.*;
import java.applet.*;
public class WelcomeApplet extends Applet
public void paint(Graphics g)
Date currentDate = new Date(); //Date constructor
g.drawString("Welcome to my day!",200,70);
g.drawString("Daily planner for Rafe McDonald",200,100);
g.drawString(currentDate.toString(),200,130);
Image smile; //declare an Image object
smile = getImage(getDocumentBase(), "smile.gif");
g.drawImage(smile,10,10,this);
setBackground(Color.cyan);
}http://discussions.apple.com/thread.jspa?threadID=2226853&tstart=0
i realized the other section of this forum is geared toward java inquiries so if anyone has some ideas please post there
thanks
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