JamesCherrill

You normally only need an ImageObserver when you are loading an image asynchronously and need to know when it's finished loading (eg in a web page). Once the Image is loaded you just need the Image itself (or a suitable public method in the class that "owns" the Image). ps …

And again. This zombie is 2 weeks old. Majestics is unlikely to be still waiting for an answer, and even less for a poor one like that (ProcessBuilder effectively replaced Runtime.exec). Please do NOT resurrect zombie threads.

Why do you create two Scanners?

Create a small class to handle the click. Have a constructor for that class that takes an int as parameter and saves its value. Crate a new instance for each JLabel, with the JLabel's index as parameter. Now when you handle the event you have the index of the JLabel …

Looks like a suffix to indicate multiple values for something basic values are m and n, second values are m1, n1 (etc) - like an array with the little 1 as the array index.

So what is the requirement? A grid of jThings that can be clicked by the user and can display icons that change as the game progresses? Either JButton or JLabel will do that for you, although the JButton syntax is more natural for something that can be clicked but not …

Are you certain the statement on line 25 is being executed? (it looks OK to me). It may be a problem with your button numbers; you test for 3 and 1, but here's what the API Java|Doc has to say about getButton()... [QUOTE]The values for button range from zero to …

For security reasons you should always be running the latest version.

How far have you got? Which step is currently blocking your progress?

What are the symptoms you are getting? - you don't actually describe the problem anywhere. Does your animation loop actually call the method to test for collisions after calling move?

You are passing the value 4 OK, but that's not the right way to get the returned value. Check out your course notes for an example of calling a method that has a return value.

FWIW I've used Eclipse for quite a few years now and am very happy with it. If I need something that's not in the basic package then there's bound to be a plugin for it. There's a bit of a learning curve over how files in the IDE relate to …

All constructors automatically call the immediate superclass's no-args constructor [I]super()[/I] as the first line, unless you code an explicit call to a constructor of the immediate superclass yourself as the first line of your constructor. If no constructor is defined for a class, the compiler creates an empty no-args constructor, …

Hi kubiac The point you may be missing is that the color isn't associated with the font directly. The font defines shapes that need to be drawn, but they are drawn using the foreground color for the place where they are being drawn. So, for example. if you are using …

Am I right in thinking that you convert 1 char to a NINE char String (8 1/0s and a blank), but try to parse them back as 8 binary chars / char. Catching an exception and throwing away the exception message is just dumb. At the very least print it …

You could concatenate all the names & grades into one String, with \n chars after each line, then display that String names[1]+ " " + grades[1] + "\n" + names[2]+ " " + grades[2] + "\n" + ... etc (but build it in a loop, obviously)

[CODE]GameBoard b = new GameBoard (); ... frame.getContentPane().add(b);[/CODE] Apart from the anachronism of the getContentPane() - not needed for years now - the driver adds an instance of GameBoard to a JFrame. Check out JFrame's (or content pane's) add method - what kind of objects can you pass as the …

Hi. What kind of info (exactly) do you want to put in your setup file? Suppose it was just a simple text file - give us an example of how a typical file might look.

Unless I've misunderstood the question here, the only strategy choice is push vs pull, ie do you recalculate the price every time you update the details, or just update the contract details, then recalc the price only when you want to display it. I don't think the Gang of Four …

RMI involves a big learning curve and quite a lot of code. IMHO it's not appropriate unless you have identified a need that requires that kind of power, flexibility, and client/server integration. If you just have a small number of fixed messages ("I'm employee 1234, can I come in please?" …

You can use Reflection to execute a method given its name in a String. Something along the lines of: [CODE]import java.lang.reflect.Method; public void invokeByName(String name) throws Exception { Method method = this.getClass().getDeclaredMethod(name); // throws NoSuchMethodException if method is not found method.invoke(this); // may throw IllegalAccessException,IllegalArgumentException, InvocationTargetException }[/CODE]

Is this just a theoretical question, or is there some particular problem that you are trying to solve? If so, there may be other better ways to approach it.

Post your code (in code tags) and the full text of the error message (including line number) and someone will take alook.

Sorry - post full of errors

What you really need is a switch statement using a String expression. Unfortunately you'll have to wait for Java 7 to get one. Until then you can set up an enum with all the cases, convert the input String to enum with valueOf(...), then switch on the enum. IMHO this …

You need to return a variable that holds an array of Rectanges. Rectangle[] isn't a variable. Think now - what is the variable that holds your array of Rectangles?

String diverName = fileLine.substring(0,fileLine.indexOf("-")); String strScore = fileLine.substring(fileLine.indexOf("-")+2, fileLine.length()); Guess what happens if there is no "-" in any particular line. ;-)

Java 1.6 includes the "Desktop API" that includes stuff like opening a web page in the system browser. [url]http://java.sun.com/developer/technicalArticles/J2SE/Desktop/javase6/desktop_api/[/url] So I have to disagree with both previous posters - it's definitely not dead, and the truly horrible 2001 code example is totally obsolete.

Since Java 1.5 the preferred way to run external processes is the new ProcessBuilder class. You may find that simple switching to that will improve things [url]http://www.java-tips.org/java-se-tips/java.util/from-runtime.exec-to-processbuilder.html[/url]

If the things are in any kind of Collection you can use addAll(Collection c), If it''s an array you can use Arrays.toList(...) to convert the array to a List that you can pass to addAll [QUOTE]but is there a way to add things into arraylist iteratively one by one? [/QUOTE] …

If you provide no explicit initialization to instance variables, they will be given default initial values, which are based only on the type of the variable (zero, false or null as appropriate). Local variables are not given default initial values. They must be initialized explicitly before they are used. The …

Its the same as int except that it holds very much larger numbers For int, from -2147483648 to 2147483647, inclusive For long, from -9223372036854775808 to 9223372036854775807, inclusive You use it whenever you want an integer value that may be bigger than the largest int

Java variables come in 2 flavours, primitives (eg int, char, byte, float, boolean - all lower case names) and reference variables (which you can think of as pointers). All variables of array or Object types are reference variables. So, in your code message_one and message_two are reference variables of type …

[QUOTE]Do you think that if I upgrade my JDK/JRE to the latest release it might solve the issue? [/QUOTE] It certainly can't do any harm, and you'll get the latest security and bug fixes. So yes, update.

Where's the code that updates the data from the database? Your structure should be: timer actionPerformed updates data objects and calls repaint() for the GUI paintComponent(...) does the minimum needed to keep the GUI in step with the data objects.

As a general rule of OO design, you shouldn't have one class getting involved with the internals of another. It entangles them to the point where you dare not change one for fear of breaking the other - exactly the opposite of how it should be. Without details of your …

There's a standard way to do this: 1. Change the WebCrawler constructor to take an instance of CrawlAnalyseGUI as a parameter - so line 15 will read [B]final WebCrawler crawler = new WebCrawler(this);[/B] Now the webcrawler has a reference to the GUI. 2. Add a public method to CrawlAnalyseGUI that …

Normally, as each client connects, you start a new Thread to handle I/O from that one client. You end up with one thread waiting for new connections, plus 1 thread per client waiting for I/O (plus threads for GUI etc).

@Mattox. Sorry, but both your suggestions are poorly thought out. move++ in the paintComponent method means that the box will move every time paintComponent is called. You have no control over how often that is, so the moves are unpredictable, and certainly have nothing to do with the space bar. …

AFAICS you have a text area in which you put the complete text of a menu. You then get that complete text back into a String, then try to parse the whole thing as a single integer. Obviously it's not just an integer, so Exception. This is more than just …

Robot.createScreenCapture()

Assuming that a b and c are all the same length... you want every element of c to be the sum of the corresponding elements in and b. Is that right? Here's a hint. you need exactly one loop.

There's only one r in Integer

java.util.Calendar allows you to add days, or months, or years, just like you asked. But if you have to do this yourself, then yes, just add 5 to the year part and leave the month and day alone* * unless, of course, the start date is 2012-02-29

The "buffer" is a byte array that is allocated like any other Object in the Java VM's memory. Because all the methods are accessing data in memory, they are fast.

Use a JDialog for the subframe - you can control its modality to block all input to other windows in your app while its open (and other variants)

Problem is: You declare [I]DefaultListModel dmodd2=new DefaultListModel();[/I] inside your ActionPeformed. This creates a new dmodd2 that exists only for the duration of your method, and "hides" the dmodd2 that you defined earlier. So your [I]dmodd2.remove(index);[/I] applies to the new temporary dmodd2, not the "real" one. Just remove the incorrect declaration.

Maybe: Create a dummy/stub version of a user created extension(ie with all the right class name & method signatures, but empty methods). You'll need this to compile your own program anyway (unless you get into heavy lifting with Reflection). When you build your distribution package, keep the .class file for …

Chesk the JavaDoc.. What type does readLine() return? What type is your variable num? That's why you get the error message. Which method in the same class as readLine() returns an integer? That's the one you need.

Line 38 you increment examScores, but line 42 you print count. I don't understand what line 38 is supposed to be doing anyway, but incrementing count here would be as good idea