Java FAQ

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• FAQ 1486 How would you execute a process from within Java?<CFSet AllSales = ArraySum(GetSalesData["MonthlySales"])>

  Submitted by Bill Sterzenbach

• FAQ 4000 Is JavaScript same as Java?
• FAQ 4001 What type of images are currently supported by JVM in browsers?
• FAQ 4002 How can I preload an image before I paint it?
• FAQ 4003 How can I minimise "Flicker" in animation?
• FAQ 4004 What is MemoryImageSource?
• FAQ 4005 Can an applet write to a clients hard disk?
• FAQ 4006 How do I view the error output from my Java applets in IE?
• FAQ 4007 How do I increase the level of debugging information displayed in the Java Console of NS?
• FAQ 4008 How do I read a text/data file into an array?
• FAQ 4009 How do I parse a comma delimited string?
• FAQ 4010 Can Java include a Windows based .exe file in its applets?
• FAQ 4011 Why aren't Java Compatibility issues as much a problem as JavaScript?
• FAQ 4012 Can my JavaScript and my Java Applet on the same page talk to each other?
• FAQ 4013 Can I let my page know that my applet has loaded?
• FAQ 4014 Can I detect if a browser is neither Netscape 4 or IE 4, and automatically redirect to another page?
• FAQ 4015 How to do a floating image applet....for example..if you check out the geocities page their logo floats at the bottom right corner of the page..no matter where you scroll?
• FAQ 4016 Can I Resize my applet after it has been loaded by the browser?
• FAQ 4017 Help! My Netscape 4 at times freezes when I visit a page with Java Applets
• FAQ 4018 Why do I keep getting a "java.lang.NullPointerException" when using arrays?
• FAQ 4019 How do I create and use multidimensional arrays in Java?
• FAQ 4020 What are picojava, microjava and Ultrajava?
• FAQ 4021 What is AWT?
• FAQ 4022 How do I make stand alone ATW applications?
• FAQ 4023 How do you open a URL from an applet?
• FAQ 4024 How can I open a URL in a particular frame?
• FAQ 4025 Can I send an Email from an applet?
• FAQ 4026 I have copied all the *.cla files still the applet won't start
• FAQ 4027 How do I capture mouse button events?
• FAQ 4028 My IE shows just a gray box in place of the Applet, works fine in NS4?
• FAQ 4029 What is a Class?
• FAQ 4030 What is an instance of a Class?
• FAQ 4031 Is there a way to let the applet know if a copy of the applet is already running?
• FAQ 4032 How do I run a CGI script from an applet?
• FAQ 4033 When I reload my applet my hidden canvas is shown directly! why?
• FAQ 4034 How do I show an hour glass cursor when some process is going on?
• FAQ 4035 What tools do I need to start writing Java Programs?
• FAQ 4036 Where is the documentation for Java Classes available?
• FAQ 4037 Which books do you recommend for a beginner?
• FAQ 4038 Which newsgroups do you recommend for a beginner?
• FAQ 4039 Which are the other Java newsgroups?
• FAQ 4040 I don't want to learn Java but I want a Java Shopping Cart which I can use for free?
• FAQ 4041 Which the current version of Java which is most popular? Where Can I get it?
• FAQ 4042 What are signed Applets?
• FAQ 4043 Can some one copy my applet from my pages and use it on his own?
• FAQ 4044 Is there no way that any one can get my class files?
• FAQ 4045 I do not want to keep the Class files on my server - They are a risk?
• FAQ 4046 My JDBC applet works fine with appletviewer but fails in a browser?
• FAQ 4047 How do we exchange data between Java and JavaScript and vice-versa?
• FAQ 4048 I know that using Java I can open a document in another frame using showDocument, but, how can I generate the content of that frame instead of getting it from a URL?
• FAQ 4049 How do I add an audio file to an applet (or application) without using an URL?
• FAQ 4050 How does one receive a text file using an Applet?
• FAQ 4051 I am trying to create a three tier client/server in which the client (a Java applet in a web page) collects information, creates a SQL string and send this to a Java JDBC application. It works fine locally using appletviewer and localhost. How do I make this application run as a service on the web server?
• FAQ 4052 Is it possible to print a form to a printer from either an applet or application?
• FAQ 4054 What is the difference between Java and JavaScript?
• FAQ 4055 I have two .java files, in one I create a new instance of the class in the second. However, when I compile the source I get the following error: "Class sql not found in type declaration", how do I get round this?
• FAQ 4056 How can I catch the OutOfMemoryError exception when running an applet>
• FAQ 4057 I found a great "thing" on a site and would like to use it. This "thing" I assume is in Java and I think it is called an applet. There is an associated file with it called "fw.class". How do I create a html file to run this "applet"?
  
• FAQ 4058 I get errors saying: "compiling: x.java x.java:3: Package x.servlet not found in import. import x.servlet.*" - whatis wrong?
• FAQ 4059 How do I pass a variables value from an Applet to HTML and vice versa?
• FAQ 4060 Is there any any way I can call functions of a java class from Server Side JavaScript?
• FAQ 4061 How can an applet which retrieves data through a http connection from a textfile, load the real one instead of the cached copy?
• FAQ 4062 How do I display an image over a button in Java?
• FAQ 4063 Is there a way to reduce the amount of time that it takes to download an applet?
• FAQ 4064 How can a Java applet get data from a website which is different from the location it was downloaded from?
• FAQ 4065 Can Java applets talk to each other?
  
• FAQ 4066 Is there any way to load applet faster in a HTML site?
• FAQ 4067 What are the various steps involved in dividing an applet into two frames so that two sepearate files can be displayed in two frames?
• FAQ 4068 How do I display an Excel graph via a Java applet?
• FAQ 4069 How do I know when a applet is loaded and how can I visualize the applet's loading on the page (i.e. a progressbar)?
• FAQ 4070 How do I close the browser window when an applet closes?
• FAQ 4071 How do I use Java Object in JScript in Internet Explorer?
• FAQ 4072 What is the diference between Java and c++?
• FAQ 4073 How can I get text to lean (at about 60 degrees) using Java?
• FAQ 4074 Can one applet load another applet on runtime, and can these two applets talk?
• FAQ 4075 In Internet Explorer 5 I have all the boxes checked for Java, but when I go into a chatroom all I see is an outline of a box and a little icon that looks like a square, circle, and triangle. What is wrong... I can not look at any applets?
• FAQ 4076 Why, when I view an applet with Netscape Navigator 4, then modify the applet, re-compile, and call up the applet again , the changes don't appear, but it uses a cached version?
• FAQ 4077 I use Java applets to chat on Yahoo, is everything I type recorded onto my hard drive or network?
• FAQ 4078 In C, I can use the system function to execute DOS-like commands e.g system("dir"); is there an equivalent in Java?
• FAQ 4079 How can I sign an applet?
• FAQ 4080 Does my applet source code have to be in my html page, or can I call it as you might a .js file in javascript, if so, what is the proper code/syntax?
• FAQ 4081 I have written a servlet that sets AutoCommit(false) and executing several insert statements with a final commit at the end. When this servlet is accessed simultaneously by several browsers, the servlet hangs and has to be restarted. Is there a way to prevent this from happening?
• FAQ 4082 How can I open a Microsoft Word document from an applet?
• FAQ 4083 How would you execute a file from within a Java file?
• FAQ 4084 Is is possible to have the server send html to the browser that contains data from a server side database and have the page contain a java applet (that has security access to read the local hard drive) to read the local hard drive and *add to* the html page?
• FAQ 4085 What is a JAR file?
• FAQ 4086 How do I learn the basics of Java?
• FAQ 4087 How to send SMTP mail from a servlet?

©2011 Martin Webb