Tagged Questions

Java is an object-oriented language and runtime environment (JRE). Java programs are platform independent, because they are compiled to bytecode and their execution is handled by a Virtual Machine called the Java VM or JVM.

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How to draw lines with java for functions like f(x,y)

i am new to graphics with java and i have a GUI that is incomplete, actually what i need is to plot functions like: f(x,y) = 100*(x²-y)² + (1-x)² where : -2.048 < x,y < 2.048. Can anyone ...
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client server error on 1 computer

I'm writing a little Client - Server Application but have the following problem: I can start the server without problems but when I try to connect with the Client it says Connection refused: connect. ...
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0answers
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How to move Jlabel from one JPanel to another

I have many JPanels and one JLabel. When I click on one JPanel I want my JLabel (contains a picture) move to this JPanel. How can this be done by code? I'm coding in NetBeans.
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1answer
13 views

Get a value from JDialog to the parent JFrame

I added a jDialog Swing Form to my project as in this image : and now I want to get the value from that jtextField to the parent JFrame when I close this JDialog, I googled about it and I found ...
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1answer
10 views

Custom head renderer attributes not being passed through

I'm trying to render a head element with a prefix attribute. In order to do this in JSF: <h:head prefix="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb# XXXX: http://ogp.me/ns/fb/XXXX#"> I ...
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3answers
21 views

DAO pattern in java what is a Business Object

Directly from this oracle article about the J2EE DAO Pattern: Everything is very clear indeed but the Business Object "participant" (as they call it). Here I quote the bit I would like more insights ...
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1answer
17 views

changing JTextField formatting

I want to change the format of this JTextField especially the font size and color. here is the code : JTextField textField = new JTextField(10); JTextArea msgArea = new JTextArea(10, 30);
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2answers
28 views

Hash set that stores subclasses of certain class JAVA

Consider the following situation: public abstract class Vegetable {}; public class Tomato extends Vegetable {}; public class Cucumber extends Vegetable {}; public class Orange {}; The point is - ...
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0answers
9 views

How do I append a quote to a string in JSF EL

I got a JSF page with a list of partners. The page is opened in two modes, default and choice mode, that is set with choiceMode request parameter. When choiceMode parameter is undefined it's just ...
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5answers
26 views

How this method is called without using the classname

I wanted to know how a static method is called in another class. Assume I have a class as following, class classA { public static void method1(String a) { } } In another class the method method1 ...
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1answer
11 views

EntityManager per DAO method

I have question about usage of EntityManager. I've read that is not wise, opening and closing an EntityManager for every simple database call in a single thread! Is it better to have one ...
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3answers
30 views

Java Transfer Object, what is it?

Directly from this oracle article about the J2EE DAO Pattern: Everything is very clear indeed but the Transfer Object "participant" (as they call it). Here I quote the bit I would like more insights ...
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1answer
15 views

Preferences in Android earlier than 3.0

I have the problem, that SharedPreferences with FragmentManager won't work in Android below 3.0. I always get this error: java.lang.NoSuchMethodError: mypackage.Settings.getFragmentManager How can ...
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0answers
29 views

how create webpage for attendance

I want to create a page for my team players to indicate their attendance for a match (it will be view on mobile device). Basically it includes a table of player name with their image on each row, and ...
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2answers
25 views

Why my form parameters not getting in JSP

This is my HTML form : <form action="supplierportal_home.jsp"> <select id="contract" name="contract"> <option selected="selected">Please Select</option> ...

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