Accessing a servlet from another class
Not to confuse anyone too much, but here's the scenario.
I have a servlet that calles other Java classes which perform various functions. Now can I have one of these classes access the servlet directly, without setting up a socket based connection. What I mean is can I just simply call its methods and have access to the HttpServletResponse/HttpServletRequest objects?
Usually the servlet gets accessed via an HTTP client where then servlet will call classes it needs to access, where here I have a class accessing the servlet directly.
I do not have the capability of running servlets at the moment so I cannot just do a quick and dirty test to see how it would be done.
Any input would be appreciated.
If you have a servlet that contains methods that
aren't related to the processing of a request (except
for initialization) then those methods are in the
wrong place. I don't know where they should be
instead, that depends on your design. Perhaps you
should post some details about what you are trying to
do here.Currently I have not written code for what I am attempting.
What I am attempting is quite an unorthodox approach of getting server information via a servlet. However unlike your standard servlet the servlet will be accessed via a java class, rather than being invoked from a URL.
If I had to use psuedo-code I would put it like this:
class A{
public void accessHeaders(){
// access servlet HttpRequest object.
// use the object.
// display header info...etc.
// main prog.
class Test {
public static void main(String[] a){
A a = new A();
a.accessHeaders();
The servlet will be a generic servlet which overrides a doGet().
That's right an app accessing a servlet. I have done this but using the java.net package but I don't want to use that in this case. Can I implicitely call the servlet?
Now the more I think about doing something like this the more I feel that it cannot be done this way.
I am new to servlets so I don't know all the ways they can be used.
Similar Messages
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Accessing a JTextField from another class
I 've got 2 classes I am trying to get the value of a JTextField that located in a second class see the code
class1 myClass = new class1();
String text = myClass.jTextField1.getText();
System.out.print(text);What happens is when i run the program and enter some text in the jTextFild1 and then click on my Jbutton it does not print anything
the JButton is in the caller class
Could anyone explains to me what is wrongan example would help maybe....
if you want to access your jtextfield from another class then:
import javax.swing.*;
public class FieldHolderClass {
public JTextField jtf = null;
public FieldHolder() {
JFrame jf = new JFrame();
jtf = new JTextField();
jtf.setText("this is the text that is here when other callerclass seeks for text");
jf.getContentPane().add(jtf);
jf.setVisible(true);
public class CallerClass {
public static void main(String args[]) {
FieldHolderClass fHolder = new FieldHolderClass();
System.out.println((fHolder.jtf.getText());
}of course i have not written any swing app for a long time, so i might have forgotten everything... so, don't flame me when that code does not compile.
the thing that it's supposed to show, is that you make a <b>public</b> variabel (jtf) and you simply ask for it from another class by typing holderclass instances name dot and that variable name (in this case jtf) and dot and then call the method on that variable (or object...)
it might also be that you want your code to work the way that when you enter a text into jtextfield, then after pressing enter it would get printed on terminal...
in that case you should also register some Listeners... i remember that back when i was just getin' to know java then i had problems with it as well... but then again, i didn't read any manuals...
i hope i was somewhat help... -
Accessing a method from another class
Ok, so this is a massively simplified version of what I need to do but using the following classes, what do I need to put in the second class to call the function from the first?
This class contains what I want to call:
package code
public class myClass1
public function myClass1()
trace("myClass1 constructed");
public function whatIWantToCall(a,b)
trace(a + b);
This is the second class:
package code
public class myClass2
public function myClass2()
myClass1Instance.whatIWantToCall(3,4);
//this doesn't work as it can't find //
//the function but it will work when //
//I use this code outside of any class//What we need to know id the relationship between the two classes.
If class2 is the child of class one, you would call a function in class1 from class2 using
parent.myFunction();
if both are children of a common parent, parent.class1.myFunction();
Or you can pass class1's function into class2 as a variable.
Assuming you have class2 instatiated
like:
package code
public class myClass1
public function myClass1()
myClass2.callFunction =whatIWantToCall;
public function whatIWantToCall(a,b)
trace(a + b);
This is the second class:
package code
public class myClass2
public var callFunction:Function;
public function myClass2():void
private function handleCallback():void
callFunction(3,4);
HTH
-Ted -
Accessing an Array List from another class
Hi, I was a member on here before, but I forgot my password and my security question is wrong.
My question is how do I access a private arraylist from a different class in the same package?
What I am trying to do is the following (hard to explain).
Make a picking client for a shop, so that when an order is recieved, the picker can click on the orders button, and view all of the current orders that have not been completed. This Pick client has its own user interface, in a seperate class from where the BoughtList array is created, in the cashier client. The boughtlist is created when the cashier puts in the product number into the cashier client and clicks buy. I seem to be having trouble accessing the list from another class. Once the order is completed the cashier clicks bought and the list is reset. There is another class in a different pagage that processes some of the functions of the order, eg newOrder().
Yes it is for Uni so I dont need / want the full answers, jist something to get started. Also please dont flame me, I have done many other parts of this project, just having trouble getting started on this one.
Here is the code for the cashier client. The code for the Pick client is almost the same, I just need to make the code that displays the orders.
package Clients;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.NumberFormat;
import java.util.Locale;
import Catalogue.*;
import DBAccess.*;
import Processing.*;
import Middle.*;
class CashierGUI
class STATE // Cashier states
public static final int PROCESS = 0;
public static final int CHECKED = 1;
class NAME // Names of buttons
public static final String CHECK = "Check";
public static final String BUY = "Buy";
public static final String CANCEL = "Cancel";
public static final String BOUGHT = "Bought";
private static final int H = 300; // Height of window pixels
private static final int W = 400; // Width of window pixels
private JLabel theAction = new JLabel();
private JTextField theInput = new JTextField();
private JTextArea theOutput = new JTextArea();
private JScrollPane theSP = new JScrollPane();
private JButton theBtCheck = new JButton( NAME.CHECK );
private JButton theBtBuy = new JButton( NAME.BUY );
private JButton theBtCancel= new JButton( NAME.CANCEL );
private JButton theBtBought= new JButton( NAME.BOUGHT );
private int theState = STATE.PROCESS; // Current state
private Product theProduct = null; // Current product
private BoughtList theBought = null; // Bought items
private Transaction theCB = new Transaction();
private StockReadWriter theStock = null;
private OrderProcessing theOrder = null;
private NumberFormat theMoney =
NumberFormat.getCurrencyInstance( Locale.UK );
public CashierGUI( RootPaneContainer rpc, MiddleFactory mf )
try //
theStock = mf.getNewStockReadWriter(); // DataBase access
theOrder = mf.getNewOrderProcessing(); // Process order
} catch ( Exception e )
System.out.println("Exception: " + e.getMessage() );
Container cp = rpc.getContentPane(); // Content Pane
Container rootWindow = (Container) rpc; // Root Window
cp.setLayout(null); // No layout manager
rootWindow.setSize( W, H ); // Size of Window
Font f = new Font("Monospaced",Font.PLAIN,12); // Font f is
theBtCheck.setBounds( 16, 25+60*0, 80, 40 ); // Check Button
theBtCheck.addActionListener( theCB ); // Listener
cp.add( theBtCheck ); // Add to canvas
theBtBuy.setBounds( 16, 25+60*1, 80, 40 ); // Buy button
theBtBuy.addActionListener( theCB ); // Listener
cp.add( theBtBuy ); // Add to canvas
theBtCancel.setBounds( 16, 25+60*2, 80, 40 ); // Cancel Button
theBtCancel.addActionListener( theCB ); // Listener
cp.add( theBtCancel ); // Add to canvas
theBtBought.setBounds( 16, 25+60*3, 80, 40 ); // Clear Button
theBtBought.addActionListener( theCB ); // Listener
cp.add( theBtBought ); // Add to canvas
theAction.setBounds( 110, 25 , 270, 20 ); // Message area
theAction.setText( "" ); // Blank
cp.add( theAction ); // Add to canvas
theInput.setBounds( 110, 50, 270, 40 ); // Input Area
theInput.setText(""); // Blank
cp.add( theInput ); // Add to canvas
theSP.setBounds( 110, 100, 270, 160 ); // Scrolling pane
theOutput.setText( "" ); // Blank
theOutput.setFont( f ); // Uses font
cp.add( theSP ); // Add to canvas
theSP.getViewport().add( theOutput ); // In TextArea
rootWindow.setVisible( true ); // Make visible
class Transaction implements ActionListener // Listener
public void actionPerformed( ActionEvent ae ) // Interaction
if ( theStock == null )
theAction.setText("No conection");
return; // No connection
String actionIs = ae.getActionCommand(); // Button
try
if ( theBought == null )
int on = theOrder.uniqueNumber(); // Unique order no.
theBought = new BoughtList( on ); // Bought list
if ( actionIs.equals( NAME.CHECK ) ) // Button CHECK
theState = STATE.PROCESS; // State process
String pn = theInput.getText().trim(); // Product no.
int amount = 1; // & quantity
if ( theStock.exists( pn ) ) // Stock Exists?
{ // T
Product pr = theStock.getDetails(pn); // Get details
if ( pr.getQuantity() >= amount ) // In stock?
{ // T
theAction.setText( // Display
pr.getDescription() + " : " + // description
theMoney.format(pr.getPrice()) + // price
" (" + pr.getQuantity() + ")" // quantity
); // of product
theProduct = pr; // Remember prod.
theProduct.setQuantity( amount ); // & quantity
theState = STATE.CHECKED; // OK await BUY
} else { // F
theAction.setText( // Not in Stock
pr.getDescription() +" not in stock"
} else { // F Stock exists
theAction.setText( // Unknown
"Unknown product number " + pn // product no.
if ( actionIs.equals( NAME.BUY ) ) // Button BUY
if ( theState != STATE.CHECKED ) // Not checked
{ // with customer
theAction.setText("Check if OK with customer first");
return;
boolean stockBought = // Buy
theStock.buyStock( // however
theProduct.getProductNo(), // may fail
theProduct.getQuantity() ); //
if ( stockBought ) // Stock bought
{ // T
theBought.add( theProduct ); // Add to bought
theOutput.setText( "" ); // clear
theOutput.append( theBought.details()); // Display
theAction.setText("Purchased " + // details
theProduct.getDescription()); //
// theInput.setText( "" );
} else { // F
theAction.setText("!!! Not in stock"); // Now no stock
theState = STATE.PROCESS; // All Done
if ( actionIs.equals( NAME.CANCEL ) ) // Button CANCEL
if ( theBought.number() >= 1 ) // item to cancel
{ // T
Product dt = theBought.remove(); // Remove from list
theStock.addStock( dt.getProductNo(), // Re-stock
dt.getQuantity() ); // as not sold
theAction.setText(""); //
theOutput.setText(theBought.details()); // display sales
} else { // F
theOutput.setText( "" ); // Clear
theState = STATE.PROCESS;
if ( actionIs.equals( NAME.BOUGHT ) ) // Button Bought
if ( theBought.number() >= 1 ) // items > 1
{ // T
theOrder.newOrder( theBought ); // Process order
theBought = null; // reset
theOutput.setText( "" ); // Clear
theInput.setText( "" ); //
theAction.setText( "Next customer" ); // New Customer
theState = STATE.PROCESS; // All Done
theInput.requestFocus(); // theInput has Focus
catch ( StockException e ) // Error
{ // Of course
theOutput.append( "Fail Stock access:" + // Should not
e.getMessage() + "\n" ); // happen
catch ( OrderException e ) // Error
{ // Of course
theOutput.append( "Fail Order process:" + // Should not
e.getMessage() + "\n" ); // happen
}(disclaimer: I did not read through your Swing code, as I find that painful)
My question is how do I access a private arraylist from a different class in the same
package?Provide a public accessor method (getMyPrivateArrayList()) -
Accessing public variables from other classes
Probably a simple questions, but how can I access a variable from another class. My exact situation is as follows.
A class called WorldCalender has a variable which is defined: public int hour; (the value is given to it elsewhere).
I want to access this variable and increase it by one in a subroutine in the class Hour. In this class I have put: WorldCalender.hour++; but it doesn't seem to work. How should I do it?don't expose the hour variable at all.
have a method eg addToHourBy( int hrs )
Probably a simple questions, but how can I access a
variable from another class. My exact situation is as
follows.
A class called WorldCalender has a variable which is
defined: public int hour; (the value is given to it
elsewhere).
I want to access this variable and increase it by one
in a subroutine in the class Hour. In this class I
have put: WorldCalender.hour++; but it doesn't seem to
work. How should I do it? -
Accessing the ServletContext from a class that is not a Servlet?
Is there any way of accessing the ServletContext from a class that is not a
Servlet? The class is being used as part of a Web Application.
Thanks.
http://www.mozilla.org/mirrors.html
Mozilla has download mirrors around the globe. If it is on the list, it is trustworthy. -
Accessing a variable defined in one class from another class..
Greetings,
I've only been programming in as3 for a couple months, and so far I've written several compositional classes that take MovieClips as inputs to handle behaviors and interactions in a simple game I'm creating. One problem I keep coming upon is that I'd love to access the custom variables I define within one class from another class. In the game I'm creating, Main.as is my document class, from which I invoke a class called 'Level1.as' which invokes all the other classes I've written.
Below I've pasted my class 'DieLikeThePhishes'. For example, I would love to know the syntax for accessing the boolean variable 'phish1BeenHit' (line 31) from another class. I've tried the dot syntax you would use to access a MovieClip inside another MovieClip and it doesn't seem to be working for me. Any ideas would be appreciated. Thanks,
- Jeremy
package jab.enemy
import flash.display.MovieClip;
import flash.events.Event;
import jab.enemy.MissleDisappear;
public class DieLikeThePhishes
private var _clip2:MovieClip; // player
private var _clip3:MovieClip; //phish1
private var _clip4:MovieClip; //phish2
private var _clip5:MovieClip; //phish3
private var _clip6:MovieClip; //phish4
private var _clip10:MovieClip; // background
private var _clip11:MovieClip // missle1
private var _clip12:MovieClip // missle2
private var _clip13:MovieClip // missle3
private var _clip14:MovieClip // missle4
private var _clip15:MovieClip // missle5
private var _clip16:MovieClip // missle6
private var _clip17:MovieClip // missle7
private var _clip18:MovieClip // missle8
private var _clip19:MovieClip // missle9
private var _clip20:MovieClip // missle10
private var _clip21:MovieClip // missle11
private var _clip22:MovieClip // missle12
var ay1 = 0;var ay2 = 0;var ay3 = 0;var ay4 = 0;
var vy1 = 0;var vy2 = 0;var vy3 = 0;var vy4 = 0;
var phish1BeenHit:Boolean = false;var phish2BeenHit:Boolean = false;
var phish3BeenHit:Boolean = false;var phish4BeenHit:Boolean = false;
public function DieLikeThePhishes(clip2:MovieClip,clip3:MovieClip,clip4:MovieClip,clip5:MovieClip,clip6:M ovieClip,clip10:MovieClip,clip11:MovieClip,clip12:MovieClip,clip13:MovieClip,clip14:MovieC lip,clip15:MovieClip,clip16:MovieClip,clip17:MovieClip,clip18:MovieClip,clip19:MovieClip,c lip20:MovieClip,clip21:MovieClip,clip22:MovieClip)
_clip2 = clip2;_clip3 = clip3;_clip4 = clip4;_clip5 = clip5;_clip6 = clip6;
_clip10 = clip10;_clip11 = clip11;_clip12 = clip12;_clip13 = clip13;_clip14 = clip14;
_clip15 = clip15;_clip16 = clip16;_clip17 = clip17;_clip18 = clip18;_clip19 = clip19;
_clip20 = clip20;_clip21 = clip21;_clip22= clip22;
_clip3.stage.addEventListener(Event.ENTER_FRAME, onEnterFrame)
function onEnterFrame(event:Event):void
vy1+= ay1;_clip3.y += vy1; vy2+= ay2;_clip4.y += vy2;
vy3+= ay3;_clip5.y += vy3; vy4+= ay4;_clip6.y += vy4;
if (phish1BeenHit ==false)
if(_clip3.y >620)
{_clip3.y = 620;}
if (phish2BeenHit ==false)
if(_clip4.y >620)
{_clip4.y = 620;}
if (phish3BeenHit ==false)
if(_clip5.y >620)
{_clip5.y = 620;}
if (phish4BeenHit ==false)
if(_clip6.y >620)
{_clip6.y = 620;}
if (_clip11.hitTestObject(_clip3) ||_clip12.hitTestObject(_clip3)||_clip13.hitTestObject(_clip3)||_clip14.hitTestObject(_cl ip3)||_clip15.hitTestObject(_clip3)||_clip16.hitTestObject(_clip3)||_clip17.hitTestObject( _clip3)||_clip18.hitTestObject(_clip3)||_clip19.hitTestObject(_clip3)||_clip20.hitTestObje ct(_clip3)||_clip21.hitTestObject(_clip3)||_clip22.hitTestObject(_clip3))
_clip3.scaleY = -Math.abs(_clip3.scaleY);
_clip3.alpha = 0.4;
ay1 = 3
vy1= -2;
phish1BeenHit = true;
if (_clip11.hitTestObject(_clip4) ||_clip12.hitTestObject(_clip4)||_clip13.hitTestObject(_clip4)||_clip14.hitTestObject(_cl ip4)||_clip15.hitTestObject(_clip4)||_clip16.hitTestObject(_clip4)||_clip17.hitTestObject( _clip4)||_clip18.hitTestObject(_clip4)||_clip19.hitTestObject(_clip4)||_clip20.hitTestObje ct(_clip4)||_clip21.hitTestObject(_clip4)||_clip22.hitTestObject(_clip4))
_clip4.scaleY = -Math.abs(_clip4.scaleY);
_clip4.alpha = 0.4;
ay2 = 3
vy2= -2;
phish2BeenHit = true;
if (_clip11.hitTestObject(_clip5) ||_clip12.hitTestObject(_clip5)||_clip13.hitTestObject(_clip5)||_clip14.hitTestObject(_cl ip5)||_clip15.hitTestObject(_clip5)||_clip16.hitTestObject(_clip5)||_clip17.hitTestObject( _clip5)||_clip18.hitTestObject(_clip5)||_clip19.hitTestObject(_clip5)||_clip20.hitTestObje ct(_clip5)||_clip21.hitTestObject(_clip5)||_clip22.hitTestObject(_clip5))
_clip5.scaleY = -Math.abs(_clip5.scaleY);
_clip5.alpha = 0.4;
ay3 = 3
vy3= -2;
phish3BeenHit = true;
if (_clip11.hitTestObject(_clip6) ||_clip12.hitTestObject(_clip6)||_clip13.hitTestObject(_clip6)||_clip14.hitTestObject(_cl ip6)||_clip15.hitTestObject(_clip6)||_clip16.hitTestObject(_clip6)||_clip17.hitTestObject( _clip6)||_clip18.hitTestObject(_clip6)||_clip19.hitTestObject(_clip6)||_clip20.hitTestObje ct(_clip6)||_clip21.hitTestObject(_clip6)||_clip22.hitTestObject(_clip6))
_clip6.scaleY = -Math.abs(_clip6.scaleY);
_clip6.alpha = 0.4;
ay4 = 3
vy4= -2;
phish4BeenHit = true;
if (_clip3.y > 10000)
_clip3.x = 1000 +3000*Math.random()-_clip10.x;
_clip3.y = 300;
_clip3.alpha = 1;
_clip3.scaleY = Math.abs(_clip3.scaleY);
ay1 = vy1 = 0;
phish1BeenHit = false;
if (_clip4.y > 10000)
_clip4.x = 1000 +3000*Math.random()-_clip10.x;
_clip4.y = 300;
_clip4.alpha = 1;
_clip4.scaleY = Math.abs(_clip4.scaleY);
ay2 = vy2 = 0;
phish2BeenHit = false;
if (_clip5.y > 10000)
_clip5.x = 1000 +3000*Math.random()-_clip10.x;
_clip5.y = 300;
_clip5.alpha = 1;
_clip5.scaleY = Math.abs(_clip5.scaleY);
ay3 = vy3 = 0;
phish3BeenHit = false;
if (_clip6.y > 10000)
_clip6.x = 1000 +3000*Math.random()-_clip10.x;
_clip6.y = 300;
_clip6.alpha = 1;
_clip6.scaleY = Math.abs(_clip6.scaleY);
ay4 = vy4 = 0;
phish4BeenHit = false;
var missleDisappear1 = new MissleDisappear(_clip11,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear2 = new MissleDisappear(_clip12,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear3 = new MissleDisappear(_clip13,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear4 = new MissleDisappear(_clip14,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear5 = new MissleDisappear(_clip15,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear6 = new MissleDisappear(_clip16,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear7 = new MissleDisappear(_clip17,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear8 = new MissleDisappear(_clip18,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear9 = new MissleDisappear(_clip19,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear10 = new MissleDisappear(_clip20,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear11 = new MissleDisappear(_clip21,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear12 = new MissleDisappear(_clip22,_clip3,_clip4,_clip5,_clip6,_clip10);I would approach it in much the same way as you would in java, by making getters and setters for all of your class variables.
Getters being for returning the values, Setters being for setting them.
So you would make a get function for the variable you want to access ala:
function get1PhishBeenHit():boolean {
return this.phish1BeenHit;
Then to access the value of that variable from outwith the class:
var result:boolean = ClassInstanceName.get1PhishBeenHit(); -
How to call a servlet from another servlet
hi everybody,
i have a problem, i have to call one servlet from another one.
Everything works on my pc, but when i install the application on the customer's server i got an error about an Uknown URL followed by the name of the machine.
Wjat i do is the folloqing :
String urlString = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+"/"+servletName;
URL url = new URL(urlString);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
the variable servletName is the name of the servlet i have to call.
Is there another way to call the servlet ?
All the servlet are installed in the same server.
Any suggestion ?
Cheers.
StefanoSweep is correct about requestDispatcher being another approach for inter-servlet delegation; the only issue that i recall with this approach is that it defaults the method of the destination servlet to the one it was called from...for example, calling servlet2 from within servlet1.post() resulted in the dispatcher attempting to utilize servlet2.post() - i believe that i searched for a parameterize solution to no avail :( (ended up handling the request by placing a "fake" doPost() in servlet2 that simply called servlet2.doGet())
however, if your application is functioning correctly on your pc/webserver then the problem may be external to servlet communication (e.g. client webserver's ports not configured or blocked, missing runtime classes, etc.)
my suggestion would be to set aside the programmatic concerns for the moment - what is the response if you open a browser on a client's machine and access the URL in question (i.e. http://clientserver:port/stefanoServlet)? If it will not respond to access in this manner then it certainly won't when your application calls for it.
It's possible that there is a coding error but, given the info supplied, i'd start examining the environment, first. Let us know if you have any luck with the test i recommended or not (please provide abundant detail). Or, if you've found the solution then you may want to post back with a quick blub so the next person knows how to escape the trap.
D -
Can I invoke a class that extends JAppl from another class extends JAppl
Can I invoke a class that extends JApplet from another class that extends JApplet. I need to invoke an applet then select an action which opens another applet. Thanks in advance.
Nobody is able to solve this problem, i cant even
think this things. i have hope so plz try and get
result and help.Did you understand what Sharad has said???
Yep, you can forward to specific error page from servlet when even error occured in JSP. In order to achieve you have to open jsp file from servlet say example by using reqdisp.forward.
handle exception in the part where you are forwarding. And forward to the specific error page inside catch block. -
Need to call a repaint from another class
I need to call a repaint from another class, but since I can't make the paint() method a static one, it will not let me access the repaint method, any ideas? thanks guys
Conorok here's a very basic idea of whats goin on...
<code>
MainFrame class (in which the paint method resides)
public void paint()
// draw lines
// opens an instance of the settings window
void procSettings_actionPerformed(ActionEvent e)
if(procRunning)
procRunning = false;
timer.stop();
procPaused = true;
procSettings s = new procSettings();
s.setSize(370, 467);
s.setLocationRelativeTo(null);
s.setResizable(false);
s.setVisible(true);
ProcSettings class
if(certain condition)
// reset the lines of the graph
// REPAINT <--- I want to know how to call this repaint, MainFrame.repaint() does not work
thanks -
How can I to control any element of my GUI from another class?
How can I to control any element of my GUI from another class?
For that, you need the external class to have the reference to your element.. If your idea is to change basic properties like width, height etc.. then you can have the constructor of the external class to take the object of the parent of your class as the parameter and modify ..
However, if the properties to be altered/accessed are custom to your element, then you will have to have the class accept an object of your class as the parameter. No other option..
What exactly is your requirement? -
How Do I Run A Class From Another Class?
Hiya everyone, id like to know how to run a class from another class.
Ive got a Login class which extends a JFrame and a Personnel class which also extends a JFrame. When i press the login button (in Login class), ive got it to decide if password/login are acceptable and if they are, I want the Login class to close then run the Personnel class.
Im just after the code which says to close this class and run the Personnel class. How do i do that?
Ive researched this but couldnt get an understandable answer!
Help would be much appreciated, Ant...This is the Login Class:
public class MainMenu extends javax.swing.JFrame {
Statement statement = null;
int currentRecord;
ResultSet rs = null;
String name = null, job = null, mission = null, login = null, password = null;
String loginVal;
String passwordVal;
/** Creates new form MainMenu */
public MainMenu() {
initComponents();
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String filename = System.getProperty("user.dir") + "/src/Personnel.mdb";
String database = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=" + filename;
Connection conn = DriverManager.getConnection( database , "","");
statement = conn.createStatement();
System.out.println("Connected...ok");
} catch (Exception e) {
System.err.println("Got a connection Problem!");
System.err.println(e.getMessage());
private void btnLoginActionPerformed(java.awt.event.ActionEvent evt) {
loginVal = txtLogin.getText();
passwordVal = txtPassword.getText();
String name = null, job = null, mission = null, login = null, password = null;
try{
rs = statement.executeQuery("SELECT Login,Password FROM Personnel WHERE Login = '" + loginVal + "' ");
System.out.println("TRYING SELECT CLAUSE");
if(rs.next()){
System.out.println("THERE IS A NEXT RECORD");
login = rs.getString(1);
password = rs.getString(2);
System.out.println("GOT THE NEXT RECORD");
System.out.println(login + password);
System.out.println("Query Complete");
}catch(Exception s){
//s.printStackTrace();
System.out.println("NO RECORDS EXIST FOR THIS LOGIN ID");
if(passwordVal.equals(password)){
System.out.println("Access Granted"); //CLOSE MAIN AND RUN CONTROL CLASS
} else{
System.out.println("Access Denied"); //RE-RUN CLASS
} -
Problem getting arraylist from another class
I am trying to call information about an arraylist from another class. I am using this code to call the size of an arraylist:
import java.io.*;
public class Test
public static void main(String argv[]) throws IOException
Echo03 thing = new Echo03();
int y=thing.value();
System.out.println(y);
Echo03 thing2 = new Echo03();
int x=thing2.percent.size();
System.out.println(x);
}from another file which starts like this:
public class Echo03 extends DefaultHandler
static ArrayList<String> percent = new ArrayList<String>();
static ArrayList<String> text = new ArrayList<String>();
int a;
public int value(){
return percent.size();
public static void main(String argv[]) throws IOException
{The second file is based on an example piece of code from the Java website. I havent posted the whole thing, but if it is relevant then please ask.
Anyway when I run Echo03 by itself, the arraylist has a size of 2. But when I run it from the Test file, it says a size of 0. Is this because the data is not being transferred between the classes? Or is the Echo03 program not executing (and hence the arraylist is not filling up)?
How can I fix this? I have tried 2 ways of calling the data (As seen in my Test file). Neither work.I didnt post the full bit of the code for the second one. Here it is:
import java.io.*;
import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import java.util.ArrayList;
import java.awt.*;
import javax.swing.*;
public class Echo03 extends DefaultHandler
static ArrayList<String> percent = new ArrayList<String>();
static ArrayList<String> text = new ArrayList<String>();
int a;
public static void main(String argv[]) throws IOException
if (argv.length != 1) {
System.err.println("Usage: cmd filename");
System.exit(1);
// Use an instance of ourselves as the SAX event handler
DefaultHandler handler = new Echo03();
// Use the default (non-validating) parser
SAXParserFactory factory = SAXParserFactory.newInstance();
try {
// Set up output stream
out = new OutputStreamWriter(System.out, "UTF8");
// Parse the input
SAXParser saxParser = factory.newSAXParser();
saxParser.parse( new File(argv[0]), handler);
for (int b=0; b<percent.size();b++){
System.out.println(percent.get(b+1));
} catch (Throwable t) {
System.exit(0);
static private Writer out;
public void startElement(String namespaceURI,
String lName, // local name
String qName, // qualified name
Attributes attrs)
throws SAXException
if (attrs != null) {
StringBuffer sb = new StringBuffer (250);
for (int i = 0; i < attrs.getLength(); i++) {
nl();
emit(attrs.getValue(i));
sb.append (attrs.getValue(i));
String sf = sb.toString ();
percent.add(sf);
System.out.println(" String: "+sf); a++;
public void characters(char buf[], int offset, int len)
throws SAXException
emit(" ");
String s = new String(buf, offset, len);
if (!s.trim().equals("")) {text.add(s); emit(s);}
//===========================================================
// Utility Methods ...
//===========================================================
// Wrap I/O exceptions in SAX exceptions, to
// suit handler signature requirements
private void emit(String s)
throws SAXException
try {
out.write(s);
out.flush();
} catch (IOException e) {
throw new SAXException("I/O error", e);
// Start a new line
private void nl()
throws SAXException
String lineEnd = System.getProperty("line.separator");
try {
out.write(lineEnd);
} catch (IOException e) {
throw new SAXException("I/O error", e);
} -
Access to MD03 from another transaction
Hi Gurus,
We did a trace to all the users, and one of them used the MD03 transaction. The point is that he has no authorization to this transaction, so probably he is accessing to it from another.
Could you help me searching any transaction where the user could jump to MD03 from menu, buttons, double click,...?
Thank you in advance.Hi,
Click on Enviornment>>Navigation profile>>Assign. In the General settings tab page you can assign the navigation profile. Just check whether the navigation profile assigned to the user has the T-code MD03. Check the seetings and t-codes in OM0K - Define navigation profile.
But as suggested by Mr.Brahmankar kindly check whether it's possible to access the transaction from MD04 if the user doesn't have the authorization of other transaction which he/she is accessing. In your case MD03. I'm not sure about that.
Regards,
Lodhi.S -
How to kill one class from another class
I need to dipose one class from another class.
So that first i have to find what are all threads running in that class and then to kill them
Assist me.Subbu_Srinivasan wrote:
I am explaining you in clear way
No you haven't been.
>
In my application i am handling many JInternalFrame.Simultaneously i am running working on more than one frame.
Due to some poor performance of some thread in one JInternalFrame,the thread is keeps on running .
i could not able to proceed further on that screen.
So i have to kill that JInternalFrame.Yoinks.
To be begin with your problem sounds like you are doing everything in one thread. So stop doing that. Second when you get it split up and if a task is taking too much time then interrupt it. No kill. Interrupt. This means the worker thread needs to check sometimes if it has been interrupted.
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