Problem altering text in JLabel
I'm trying to create a little swing program consisting of just a single JFrame and some buttons and some labels. It is just for fun and I thought it would be easy, but I've run into a strange problem that I just can't figure out.
Essentially when the user clicks a button a JLabel has a number that needs to increment by 1 (it essentially displays a value that indicates how many times that button has been pressed).
Problem is that when I click the button the JLabel_name.setText("String" + Integer.toString(newly_incremented_integer) creates a stack trace with what looks like a NullPointerException.
Even when I try to use the JLabel.getText() method it throws the stack trace. Why would this happen?
This is the section of code in the Listener that deals with that button:
Code:
if (actionCommand.equalsIgnoreCase("press"))
{
bTotal++;
bCounterString = ("Count: " + Integer.toString(bTotal));
bCounter.setText(bCounterString);
I'm sure it is something forehead-slappingly obvious.
Here is the stack trace:
Code:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at test.MyWindow$mainListener.actionPerformed(MyWindow.java:132)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6041)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5806)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4413)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2440)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
