some java help needed!

Loco

Doing an atm simulator

Need an if statement so the user has to enter an amount in multiples of 20, ie 20 40 60 80 and so on. When the user clicks ok and hasnt entered it like this i will use a msg box.

Also need an if statement so that when the user clicks ok and the text field is empty that i wont get an error and can msg box instead i have tried a few ways but they dont seem to be working.

Finally need a method to deselect all the radio buttons and call the method from a button

public void Deselect()
{
twentyBtn.setSelected(false);
fiftyBtn.setSelected(false);
hundredBtn.setSelected(false);
twohundredBtn.setSelected(false);
fivehundredBtn.setSelected(false);
}
this doesnt seem to work for me

Karoma

1. best approach: Regular Expressions ( must be a 2,4,6,8 AND at least one zero..)

2. just test if field ==null || field.equals("") --> call a popup box..

3. Button -> ActionEvent -- trigger the Deselect()

something along the lines of:

Create a button called ClearButton and add action listener
and..

public void actionPerformed(ActionEvent event)
{
  Object source = event.getSource();

  if(source == ClearButton)
  {
    deselect();
  }
}

timeout

Why do you need to deselect a button?

If you are reading the values from the buttons I can understand but why not read it directly from a text box. Simply make a textbox that will display the selected value.Set it so its unEditable. As the user selects the different values, clear the text box and replace it with the new value. Now just read the value from the textbox. when needed.

MrPinK

Originally posted by Loco
Need an if statement so the user has to enter an amount in multiples of 20, ie 20 40 60 80 and so on.

if (value % 20 != 0) will catch all values that aren't multiples of 20.

Loco

thanks for the replies

I need the radio buttons to be deselected when the panel is exited(im using cardlaylout).. so when the user comes back there is not already one selected.
calling it from the buttons when the panel is exited does do anything
----


if(amountFld==null)
{
JOptionPane.showMessageDialog(null, "Please enter a value");
}

this code gives me the error:

java.lang.NumberFormatException: For input string: ""

with a long list underneath it

Karoma

Paste code + the full stack trace (error) please.

Loco

java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:447)
at java.lang.Integer.parseInt(Integer.java:476)
at Otheramount.actionPerformed(Otheramount.java:66)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1764)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1817)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:419)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:257)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)
at java.awt.Component.processMouseEvent(Component.java:5134)
at java.awt.Component.processEvent(Component.java:4931)
at java.awt.Container.processEvent(Container.java:1566)
at java.awt.Component.dispatchEventImpl(Component.java:3639)
at java.awt.Container.dispatchEventImpl(Container.java:1623)
at java.awt.Component.dispatchEvent(Component.java:3480)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3165)

at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095)
at java.awt.Container.dispatchEventImpl(Container.java:1609)
at java.awt.Window.dispatchEventImpl(Window.java:1590)
at java.awt.Component.dispatchEvent(Component.java:3480)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)

Loco

multiples of 20 thingy is working now thanks guys


still need to catch that blank textfield error & clear radio buttons

that method just is not working i think, its doesnt respond to the method at all
am i using the wrong commands ?

Loco

its a JTextField and JRadiobuttons if that makes any difference O_o

Loco

just the radio buttons now .setSelected isnt workin for meh jradio buttons for some reason

timeout

You really need to post up some sample code for us to look at. With most radio buttons at least one must be selected. Have you placed them in a button group? here try thislink might sort something for you.

Again post some sample code. Try .equals("") on the textbox.

Timeout