Question: I’m building some process control software and I need to addlabels, such as Upper Control Limit (UCL), into my chart. Answer: The graph control was added to PowerBuilder in

Question: How can code in one frame construct an object whose constructor is declared in another frame? For example, new parent.SomeObject(); does not seem to work. Why? Answer: Good question!

Question: I know I can’t read files from a local machine through my browser, but I can’t seem to read a file off my originating server either. There’s a way

Question: I have this declaration in init: pushButton1 = new Button(“0”). In the action class I try to increase the value from 0 through 9 every time I click the

Question: Is it possible to pass a method to another class,so that method can be called by that class at a later date?For example, in C you can pass an

Question: What is the difference between the types’float’ and ‘Float’ in Java? Answer: A variable of type float contains an IEEE single precision number,while a variable of type Float contains

Question: I would like to create a very simple applet that pings anIP address and returns a message stating whether that IP is alive. Icouldn’t find any straightforward answers to

Question: I’ve been to sites where dialog boxes appear. How can I create one?I also want to ask users for their names, and then to be able to tell how

Question: How do I include reserved characters suchas double-quote in the strings passed to an applet from a PARAM tag?Standard SGML entities don’t work; the UNIX backslash method doesn’t work.

Question: Why doesn’t the window.close() method always work? Answer: In JavaScript 2.0, the window.close() method could be used to close any open browser window. People being the malicious animals that

Question: Where can I find algorithms and data structures, techniques and programs that will better show me how they can be implemented using ANSI C? Other areas include Hashing, Heaps,

Question: How do I create a TextField that handles a password?What are the KEY_ACTION events associated with it? Answer: The setEchoCharacter() method within the TextField class allows youto do precisely

Question: I would like to be able to browse my server and havean applet/program that would mimic the functions of,say, the control panel on a Macintosh.Would I needto write a

Question: Constant downloading and fear of accumulating masses of useless files is turning me off on Internet. My concept of Java is that exe files, etc., will be on the

Question: Is it possible to have Java talk to a localserial port on a machine, for example,COM1 or COM2 on a PC?Is there a way to do this without nativemethods,

Question: How do I refer to/utilize the getImage(…) method whenusing it in an application, as I can only get it to work for an applet? Answer: To display images in

Question: Is it possible to add a menu bar to an applet without usingFrame as the container?Also, is it possible to show a Frame without a new window poppingup?I am

Question: How can I respond to a mousedown event in a TextField? Answer: From the Java 1.0.2 API specs:“In Java 1.0, the AWT does not send mouse or focus events

Question: How can I use JavaScript functions defined in an external file? Answer: When JavaScript and the tags, you can save it in a separate file and add a src

Question: Can JavaScript be used to access the client’s printer? Answer: No. JavaScript was designed so that malicious JavaScript programmers would have very little power to make their victims miserable.

Question: I am unable to run an applet and use a drop-downbox on the same page when using Netscape. The page hasmassive flickering and the applet will sometimes run. Theapplet

Question: I know that in order to pass something byreference, you pass an already-created objectand let the subroutine modify the contents ofthat object. Unfortunately, the Integer, String,etc. objects don’t allow

Question: Is there a way to determine the number ofinstantiated objects of a certain class? Answer: Unfortunately, there are no methods of class Object orClass thattrack the number of extant

Question: I want a copy of an instance not a reference, e.g.(Image). Iknow of the clone method, but not many classes have it. Along those lines,does Java pass objects to

Question: Is it possible to launch another application from aJava application (not an applet)? Answer: Yes. There are two classes of interest for performingsystem level functions such as this: java.lang.Runtime

Question: How can I append to a file in Java?The file is ASCII. It exists. The program hasrights to the file. I just need to add to the endof the

Question: How do you calculate sqrt()? Answer: Of course the best way to compute square roots is to useMath.sqrt(),but I assume your question is academic. I’m not sure of the

Question: I am trying to write a Java applet which canretrieve data from the user and then write itto a file on the server. Unfortunately I do nothave the access

Question: I am trying to create a Java routine to play an .au file whenit starts up (I want to then add this as a startup to my Web page).I

Question: I am new to Java and am currently trying toassociate idioms and techniques from otherlanguages/environments with like capabilities inJava. Specifically, I am trying to determine howto perform inter-thread and