Functions in applet classes

hi guys
can u tell me whether functions other than init(),paint(),action(),etc(which are the basic functions) are allowed in an applet class.
Thanks!
avichal167

He Maxx,then what's wrong in this one:
(Please tell me something about "exceptions" which I should give in the paint() method.)
I have written this code for a GUI which checks for 4 types of punctuation errors in .txt files.
The code compiles correctly and the Gui also appears nicely but when I Give a pathname in the space provided(also using the escape sequence '\\' for the '\' character ) it does not generate the "errors.txt"
file whhich it is supposed to do.
The code is as follows:
import java.io.*;
import java.awt.*;
import java.applet.*;
public class textcopy extends Applet
public void init()
Choice ch=new Choice();
ch.addItem("Click Next to continue.");
ch.addItem("Framework Properties");
Label l1=new Label(" ");
Label nm=new Label("Please specify the errors that you want to be checked for in the file:");
Label a1=new Label("Write the pathname here:");
ta=new TextArea(1,20);
B=new Button("OK");
Checkbox b1=new Checkbox("Punctuation errors");
Checkbox b2=new Checkbox("Finding whether a key string is misspelt");
Label l2=new Label("Please select the key string from one of these:");
add(a1);
add(ta);
add(B);
add(l1);
add(nm);
add(b1);
add(b2);
add(l2);
add(ch);
TextArea ta;
Button B;String str="";
public boolean action(Event e,Object obj)
if(e.target instanceof Button)
repaint();
return true;
return false;
public void paint(Graphics g)
String s=ta.getText();
try{
FileReader fin=new FileReader(s);
PrintWriter fout=new PrintWriter(new BufferedWriter(new FileWriter("errors.txt")));
parse(fin,fout);
fin.close();
fout.close();
catch(IOException e){}
//This is the code for the parser ------it is perfectly correct--so you dont need to check this.
public static void parse(FileReader fin,PrintWriter fout)throws IOException
String str="Punctuation Errors:\n"; /*Heading*/
fout.println(str);
fout.println("========================================================");
int i=0,j=0,k=0,l=0;
j=fin.read();
do{
do{
i=j;
j=fin.read();
}while((!((char)i=='('&&(char)j=='R'))&&(j!=-1));
if(j==-1)break;
j=fin.read();
j=fin.read();
j=fin.read();
j=fin.read();
j=fin.read();
j=fin.read();
j=fin.read();
char refnum[]=new char[5];
l=0;
while((char)j!=')')
j=fin.read();
if((char)j!=')')
refnum[l++]=(char)j;
fout.write("REF. NUM: ");
for(int a=0;a<l;a++)fout.write(refnum[a]);fout.write(": ");
j=fin.read();
l=0;
do{
i=j;
j=fin.read();
if((char)i=='\n')
k++;
//'k' gives the line no. and finally the no. of lines and neglects the lines before first occurence of "Ref Num
if(((char)i==',')&&((char)j!=' '))
l++;
String st=l+". error at line number "+ (k+1) + ": There should be "+
"a space after comma(,) \n";
fout.println(st);
if(((char)i=='.')&&((char)j!=' '))
l++;
String st=l+". error at line number "+ (k+1) + ": There should be "+
"a space after period(.) \n";
fout.println(st);
if(((char)i=='.')&&((char)j=='.'))
l++;
String st=l+". error at line number "+ (k+1) + ": There should not be "+
"two periods(.) together \n";
fout.println(st);
if(((char)i==' ')&&((char)j=='.'))
l++;
String st=l+". error at line number "+ (k+1) + ": There should not be "+
"a space before a period(.) \n ";
fout.println(st);
}while((!((char)i=='-' && (char)j=='T')) && j!=-1);
fout.println(" ");
/*if(l==0)
fout.println("No errors!!!!");*/
if(j==-1)break;
}while(j!=-1);
The html file I made for this is as follows:
<html>
<body bgcolor="Red">
<center>
<h1><b>Welcome to qch </b></h1>
<applet code=textcopy.class width=800 height=400 >
</applet>
</center>
</body>
</html>
N.B.:I have not used main() in the above program becoz it would not have been a pure GUI program
Please see what I did wrong in the above code.
Thanks in advance
Avichal

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862087 wrote:
Hi,
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could you please tell me in detail. why so. or any reference for it. i love to read.
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Message was edited by:
arijit_datta

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Hi,
I need to evaluate some Javascript expressions inside my java code... BUT my code is not inside an Applet class. Does anyone know how to do it?
I chose to use the netscape.javascript package, it work well inside an applet.. but my application doesn't run inside an applet. When I try to run it inside a standalone application it fails (even if the application extends from the Applet class).
Here is part of the code:
public class Applet1 extends Applet {
public void init() {
try {
String out;
JSObject win = JSObject.getWindow(this);
out=win.eval("2+3;").toString();
jLabel1.setText(out);
System.out.print(out);
public static void main(String[] args){
Applet1 app=new Applet1();
app.init();
The code runs perfect inside Internet explorer, but it crashes when running in standalone mode.
Thanks.

You can also use Rhino to execute JavaScript
http://www.mozilla.org/rhino/

Functions in a class

Ok, I have found defining classes in .as files can be very
useful for me. I have a few functions that are being called over
and over again in different movies. There is what I want / need to
do in order to stream line the creating and updating of the flash
site. I want to see if I can put those same functions into a class
(.as file) so I can access them from anywhere in the flash movie.
The problem is when I just try to copy and paste the functions to
the .as file (func.as) and then call the function by,
func.FunctionName I get errors. The movie is calling the functions
when buttons are pressed. Any ideas? I will attach some functions I
am using that I would like to move to the func.as file.

OK........ Couple of things I see....
func.as
package{
public class func{ // This is the name of your class and as
such, it needs a constructor.....
public function func() {
// Doesn't need to do anything
Your import should be inside your package but outside the
class definition
You need to import your package into your Flash shell before
you can call the BackToMenu funciton (this is the real reason for
the error).
If you get an error about not being able to nest packages,
you'll need to adjust things
package com.mysite.common {
the above line will assume that you have folders relative to
your flash shell of the same names.....
com \ mysite \ common \ func.as
If this doesn't make sense, just let me know. We'll get it
straightened out.

Calling a function in another class that is not the App delegate nor a sngl

Hi all-
OK- I have searched and read and searched, however I cannot figure out an easy way to call a function in another class if that class is not the app delegate (I have that down) nor a singleton (done that also- but too much code)
If you use the method Rick posted:
MainView *myMainView = [[MainView alloc] init];
[MyMainView goTell];
That works, however myMainView is a second instance of the class MainView- I want to talk to the instance/Class already instantiated.
Is there a way to do that without making the class a singleton?
Thanks!

I had some trouble wrapping my head around this stuff at first too.
I've gotten pretty good at letting my objects communicate with one another, however I don't think my method is the most efficient or organized way but I'll try to explain the basic idea.
When you want a class to be able to talk to another class that's initialized elsewhere, the class your making should just have a pointer in it to the class you want to communicate with. Then at some point (during your init function for example) you should set the pointer to the class you're trying to message.
for example in the app-delegate assume you have an instance of a MainView class
and the app-delegate also makes an instance of a class called WorkClass
If you want WorkClass to know about MainView just give it a pointer of MainView and set it when it's instantiated.
So WorkClass might be defined something like this
//WorkClass.h
@import "MainView.h"
@interface WorkClass : NSObject
MainView *myPointerToTheMainView;
@property (retain) myPointerToTheMainView;
-(void)tellMainViewHello;
@end
//WorkClass.m
@import "WorkClass.h"
@implementation WorkClass
@synthesize myPointerToTheMainView;//this makes getter and setter functions for
//the pointer and allows us to use the dot
//syntax to refrence it.
-(void)tellMainViewHello
[myPointerToTheMainView hello]; //sends a message to the main view
//assume the class MainView has defined a
//method -(void)hello
@end
now somewhere in the app delegate you would make the WorkClass instance and pass it a reference to the MainView class so that WorkClass would be able to call it's say hello method, and have the method go where you want (to the single instance of MainView owned by the app-delegate)
ex:
//somewhere in app-delegate's initialization
//assume MainView *theMainView exists and is instantiated.
WorkClass *myWorkClass = [[WorkClass alloc] init];
myWorkClass.myPointerToTheMainView = theMainView; //now myWorkClass can speak with
// the main view through it's
// reference to it
I hope that gets the basic idea across.
I'm pretty new to Obj-c myself so if I made any mistakes or if anyone has a better way to go about this please feel free to add
Message was edited by: kodafox

Calling a function inside another class

I have the following two classes and can't seem to figure to figure out how to call a function in the top one from the bottom one. The top one get instantiated on the root timeline. The bottom one gets instantiated from the top one. How do I call functions between the classes. Also, what if I had another call instantiated in top one and wanted to call a function in the bottom class from the second class?
Thanks a lot for any help!!!
package
     import flash.display.MovieClip;
     public class ThumbGridMain extends MovieClip
          private var grid:CreateGrid;
          public function ThumbGridMain():void
               grid = new CreateGrid();
          public function testFunc():void
               trace("testFunc was called");
package
     import flash.display.MovieClip;
     public class CreateGrid extends MovieClip
          public function CreateGrid():void
               parent.testFunc();

kglad,
Although I agree that utilizing events the way you attempted in your suggestion is better for at least a reason of eliminating dependency on parent, still you code doesn't not accomplish what Brian needs.
Merely adding event listener to grid instance does nothing - there is no mechanism in the code that invokes callTGMFunction - thus event will not be dispatched. So, either callTGMFunction should be called on the instance (why use events - not direct call - in this case?), or grid instance needs to dispatch this event based on some internal logic ofCreateGrid AFTER it is instantiated - perhaps when it is either added to stage or added to display list via Event.ADDED. Without such a mechanism, how is it a superior correct way OOP?
Also, in your code in ThumbGridMain class testFunc is missing parameter that it expects - Event.
Am I missing something?
I guess the code may be (it still looks more cumbersome and less elegant than direct function call):
package
     import flash.display.MovieClip;
     import flash.events.Event;
     public class ThumbGridMain extends MovieClip
         private var grid:CreateGrid;
         public function ThumbGridMain():void
             grid = new CreateGrid();
             grid.addEventListener("callTGMFunction", testFunc);
             addChild(grid);
        // to call a CreateGrid function named cgFunction()
         public function callCG(){
             grid.cgFunction();
         public function testFunc(e:Event):void
             trace("testFunc was called");
package
     import flash.display.MovieClip;
     import flash.events.Event;
     import flash.events.Event;
     public class CreateGrid extends MovieClip
         public function CreateGrid():void
             if (stage) init();
             else addEventListener(Event.ADDED, callTGMFunction);
         // to call a TGM function
         public function callTGMFunction(e:Event = null):void
           // I forgot this one
            removeEventListener(Event.ADDED, callTGMFunction);
            this.dispatchEvent(new Event("callTGMFunction"));
        public function cgFunction(){
             trace("cg function called");
I think this is a case of personal preference.
With that said, it is definitely better if instance doesn't rely on the object it is instnatiated by - so, in this case, either parent should listen to event or call a function directly.

Functions in applet classes

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