Trouble with my dropdown menu
I'm new to Java and I am getting pretty frustrated. I need a drop-down menu in my calculator and I'm probably doing this all wrong.
When I compile my code, I don't get any errors but when I run it, I get:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at mortgagePaymentAmount.mortgagePaymentAmount(mortgagePaymentAmount.java:50)
at mortgagePaymentAmount.<init>(mortgagePaymentAmount.java:27)
at mortgagePaymentAmount$4.run(mortgagePaymentAmount.java:243)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:598)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:300)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:210)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:200)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:195)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:187)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
Here is my code. Can someone please help me out? Thank you.
import java.lang.*;
import java.text.DecimalFormat;
import javax.swing.*;
public class mortgagePaymentAmount extends javax.swing.JFrame
public mortgagePaymentAmount()
mortgagePaymentAmount();
private void mortgagePaymentAmount()
/*From http://java.sun.com/docs/books/tutorial/uiswing/learn/index.html*/
/*Fields for user to input data and labels on the side of the fields*/
//Amount of mortgage
loanAmountTextField = new javax.swing.JTextField();
loanAmountLabel = new javax.swing.JLabel();
//Term of mortgage
monthsTextField = new javax.swing.JTextField();
monthsLabel = new javax.swing.JLabel();
//Interest rate
interestTextField = new javax.swing.JTextField();
interestLabel = new javax.swing.JLabel();
menuBar = new javax.swing.JMenuBar();
frame.setJMenuBar(menuBar);
menu = new javax.swing.JMenu("Menu Label");
item1 = new javax.swing.JMenuItem("Item Label 1");
item2 = new javax.swing.JMenuItem("Item Label 2");
//Calculate
calcButton = new javax.swing.JButton();
calcButton.setText("Calculate");
calcButton.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
{ calcButtonActionPerformed(evt); }
//Reset
resetButton = new javax.swing.JButton();
resetButton.setText("Reset form");
resetButton.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
{ resetButtonActionPerformed(evt); }
//Quit
quitButton = new javax.swing.JButton();
quitButton.setText("Quit");
quitButton.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
{ quitButtonActionPerformed(evt); }
//Monthly payment amount display
monthlyPaymentLabel = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
//Title
setTitle("Mortgage Calculator v2.3");
//Labels for each field
loanAmountLabel.setText("Amount of Mortgage (no commas)");
monthsLabel.setText("Term of Mortgage (in years)");
interestLabel.setText("% interest rate");
monthlyPaymentLabel.setText("Monthly payment amount");
//Layout of buttons using
//http://java.sun.com/docs/books/tutorial/uiswing/examples/learn/CelsiusConverterProject/src/learn/CelsiusConverterGUI.java
//as my template
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup( //Horizontal positioning
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
//Loan amount field and label position
.addGroup(layout.createSequentialGroup()
.addComponent(loanAmountTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(loanAmountLabel))
//Months field and label position
.addGroup(layout.createSequentialGroup()
.addComponent(monthsTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(monthsLabel))
//Interest field and label position
.addGroup(layout.createSequentialGroup()
.addComponent(interestTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(interestLabel))
//Menu bar
.addGroup(layout.createSequentialGroup()
.addComponent(menuBar, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(menuBar))
//Calculate button
.addGroup(layout.createSequentialGroup()
.addComponent(calcButton)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(monthlyPaymentLabel))
//Reset button
.addGroup(layout.createSequentialGroup()
.addComponent(resetButton)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(monthlyPaymentLabel))
//Quit button
.addGroup(layout.createSequentialGroup()
.addComponent(quitButton)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(monthlyPaymentLabel)))
.addContainerGap(30, Short.MAX_VALUE)) //length
layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {item2, item1, menu, menuBar, resetButton, quitButton, calcButton, loanAmountTextField, monthsTextField, interestTextField});
layout.setVerticalGroup( //Vertical positioning
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
//Loan amount field and label position
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(loanAmountTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(loanAmountLabel))
//Months field and label position
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(monthsTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(monthsLabel))
//Interest field and label position
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(interestTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(interestLabel))
//Menu bar
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(menuBar, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(menuBar))
//Calculate button
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(calcButton)
.addComponent(monthlyPaymentLabel))
//Reset button
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(resetButton))
//Quit button
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(quitButton))
.addContainerGap(20, Short.MAX_VALUE)) //height
pack();
//Calculation action
private void calcButtonActionPerformed(java.awt.event.ActionEvent evt)
DecimalFormat df = new DecimalFormat("0.##"); //DecimalFormat derived from http://forum.java.sun.com/ to make no more than two decimal places.
//My calcuations
double months = ((Double.parseDouble(monthsTextField.getText())) * 12); //months calculated into years
double loanAmount = (Double.parseDouble(loanAmountTextField.getText()) );
double interest = ((Double.parseDouble(interestTextField.getText())) / 100); //interest decimal calculated into percentage
double monthlyAmount = (loanAmount * (interest/12.0))/(1 - 1 /Math.pow((1 + interest/12.0), months));
monthlyPaymentLabel.setText(df.format(monthlyAmount) + " Monthly payment amount"); //output
//Reset action
private void resetButtonActionPerformed(java.awt.event.ActionEvent evt)
new mortgagePaymentAmount().setVisible(true);
//Quit action
private void quitButtonActionPerformed(java.awt.event.ActionEvent evt)
System.exit(0);
//Run the program
public static void main(String args[])
java.awt.EventQueue.invokeLater(new Runnable()
public void run()
new mortgagePaymentAmount().setVisible(true);
//variables
private javax.swing.JLabel loanAmountLabel;
private javax.swing.JLabel monthsLabel;
private javax.swing.JLabel interestLabel;
private javax.swing.JFrame frame;
private javax.swing.JMenuBar menuBar;
private javax.swing.JMenu menu;
private javax.swing.JMenuItem item1;
private javax.swing.JMenuItem item2;
private javax.swing.JButton calcButton;
private javax.swing.JLabel monthlyPaymentLabel;
private javax.swing.JTextField loanAmountTextField;
private javax.swing.JTextField monthsTextField;
private javax.swing.JTextField interestTextField;
private javax.swing.JButton quitButton;
private javax.swing.JButton resetButton;
}
Don't be scared of actually reading these stacktraces - a lot of the time they give you all you need to solve your problem. This one tells you that there's a NullPointerException at line 50 of your class - you're trying to do something to, or call a method on, something that doesn't exist.
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Hi,
I need dropdown menu for my project. I know Captivate is
giving dropdown menu if i use project>Skin but its skin is not
matching with my project interface also it is not letting me to
customized it.
If i make the dropdown menu in flash and import the .swf in
captivate, is it possible to give interactivity to flash
dropdownmenu to the captivate slides and if yes how to do it?Hello pocketPc
In most cases you would create this the same way that you
would any other kind of interactive simulation.
You start by capturing your screens using either the training
simulation or assessment simulation recording mode. Captivate would
then add click boxes to the dropdown menu and radio button when you
click on these items in the application you are capturing your
screens from.
That way once you finish your screen capture session you
would end up with a slide that shows for example the radio button
in its default state and another slide with the radio button
selected. Same goes for the dropdown menu.
If this isn't what you require then please provide us with
some more details so that you can advise you better.
Regards,
Mark -
Hello, my name is Ed. I'm with all my Ipod, I have (4) they all keep freezing up on me when I play my devices. But my Ipod Touch I don't have this problem. On my classic I'll hold down menu botton on the wheel. But thing happen, I'm tired of letting battery go dead and recharge it, just to freeze up again. I made it work one time by holding down the menu button. That's about it. I need help.
Ed Shelton
PS I don't know operation system on my ipod classic, but on my mac book pro i am using (11.0.2) my mac os x (10.6.8). So, I try to take a quess at my os my classicHolding down the center/select button and the menu button will reboot your ipod. See if that helps. Also, I'd recommend something else- I had nothing but trouble with my ipod classic until I spent $20 to get Mac OS Mountain Lion. It did what you said and sometimes wouldnt play, or wouldnt power on...
Try rebooting your ipod and let me know what happens and maybe in the future obtain Mountain Lion to aide your ipod in functionality.
Good luck! -
Crystal reports with static list parameter : blank dropdown menu
Hi,
I've created a very simple report displaying customer order (ordr and rdr1)
it has :
parameter DocKey@ used in the selection formula DocKey@=DocEntry
It also has another parameter : static list with 2 entries
- 1 : normal presentation
- 2 : proforma presentation
The user has to choose between option 1 or 2 before displaying the report
Using the report in the Crystal application is OK : i can choose between option 1 and 2 in a dropdown list
If i use the Addin Menu // preview in SAP : i can choose in the dropdown menu
If i import my report in SAP and i try to preview it : the dropdown menu is empty and i cannot select anything
Anyone has the same problem ?
I use SAp SBO 8.8 pl 00 hotfix 14
I 've the same report worrking on a sap sbo 8.8 sp 00 pl 11
thanks for your helpHi and thanks for your help
I've tried with and without default values : no changes
I've tested with the last pl (18) and it works fine : no blank dropdown menu , i can select a value for my static parameter !
Edited by: Antoine TESSIER on Jan 6, 2011 11:47 AM -
Android – html with dropdown menu not working
hi everybody,
I'm creating a digital pubblication fo android and I'm testing it on an Asus tablet.
I just have a big html widget showing a local web application. Everything works except a simple dropdown menu: when I tap on the button that should open the dropdown items, the button highlights itself, but the options don't appear.
this the HTML code:
Size: 4
4,5
5
5,5
6
6,5
7
7,5
8
8,5
9
9,5
10
10,5
11
11,5
12
12,5
13
13,5
I'm sure it worked on a Samsung tablet (within the DPS app), and it works on the Asus if I access to the application via browser.
it only doesn't work when loading it within the DPS app on the Asus device. is the tablet brand the problem?
my android version is: 4.2.2.
anybody can help me, please?
thank you very much.it works with the native android viewer!
but with this there's another problema (that the legacy one doesn't have): I have a simple form and the last text field appears beneath the keyboard.
with the legacy viewer each time I move the focus from a textfield to the next one, the text field moves upwards to be visible (and not hidden by the keyboard).
this is the code for the form:
<div data-role="fieldcontain" class="text-field">
<label for="firstname">Nome:</label>
<input type="text" name="firstname" value="" placeholder="" class="required" id="firstname" />
</div>
<div data-role="fieldcontain" class="text-field">
<label for="surname">Cognome:</label>
<input type="text" name="surname" value="" placeholder="" class="required" id="surname" />
</div>
<div data-role="fieldcontain" class="text-field">
<label for="surname">Indirizzo:</label>
<input type="text" name="address" value="" placeholder="" id="address" class="required"/>
</div>
<div data-role="fieldcontain" class="text-field">
<label for="email">Email:</label>
<input type="email" name="email" value="" placeholder="" class="required" id="email" title="Your error message" />
<div class='error_message'></div>
</div>
<div data-role="fieldcontain" class="text-field note">
<label for="message">Note :</label>
<textarea name="message" id="message" placeholder="" ></textarea>
</div>
<div data-role="fieldcontain" class="text-field mail">
<label for="email_shop">Email negozio:</label>
<input type="email" name="email_shop" value="" placeholder="" class="required" id="email_shop" />
</div> -
Hi,
i am new at apex and i try to create a button with dropdown menu. any help? i dont want to use plugin but create a new one... i know that i need jquery and i have tha basic knowledge.
thanks,
AdvenHi,
You could try to create a list with as template Pull Down Menu.
Make sure that you create parent-child relations to get the pull down menu options.
It also depends on the theme you pick up.
Hope it works for u
Sunil Bhatia
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