When i move the slider, I get a this error:Įxception in thread "AWT-EventQueue-0" Īt calculations.M圜ontrolPanel$M圜hangeAction.stateChanged(M圜ontrolPanel.java:79)Īt (JSlider.java:432)Īt $ModelListener.stateChanged(JSlider.java:350)Īt (DefaultBoundedRangeModel.java:364)Īt (DefaultBoundedRangeModel.java:302)Īt (DefaultBoundedRangeModel.java:231)Īt (JSlider.java:652)Īt .BasicSliderUI$TrackListener.mousePressed(BasicSliderUI.java:1632)Īt .SynthSliderUI$SynthTrackListener.mousePressed(SynthSliderUI.java:924)Īt (Component.java:6502)Īt (JComponent.java:3320)Īt (Component.java:6270)Īt (Container.java:2229)Īt (Component.java:4861)Īt (Container.java:2287)Īt (Component.java:4687)Īt (Container.java:4832)Īt (Container.java:4489)Īt (Container.java:4422)Īt (Container.java:2273)Īt (Window.java:2719)Īt (EventQueue.java:735)Īt $200(EventQueue.java:103)Īt $3.run(EventQueue.java:694)Īt $3.run(EventQueue.java:692)Īt (Native Method)Īt $1.doIntersectionPrivilege(ProtectionDomain.java:76)Īt $1.doIntersectionPrivilege(ProtectionDomain.java:87)Īt $4.run(EventQueue.java:708)Īt $4.run(EventQueue.java:706)Īt (EventQueue.java:705)Īt (EventDispatchThread.java:242)Īt (EventDispatchThread.java:161)Īt (EventDispatchThread.java:150)Īt (EventDispatchThread.java:146)Īt (EventDispatchThread.java:138)Īt (EventDispatchThread.java:91)Ĭan anyone help me with this ? Probably easier if you download my program. When i run the program and move the slider it is meant to calculate the boundary length and area, of the chosen shape, which is chosen using the menuItems(Circle, Square, Triangle).
Nullpointerexception java new flowlayout code#
Sorry If download links aren't allowed, ill remove it straight away if so. Exception in thread 'main' at (Demo.java:11) According to Java documentation a NullPointerException occurs if you try to Call the a method (instance) using null object. hi There In My Following Code Um Trying To Add Empty Row when Pressing The Button when I Press The Button for The First Time It Adds an Empty Row But When Trying To Add More Rows It Gives NullPointerException Exception in thread " AWT-EventQueue-0" at TablePrepareRenderer1.prepareRenderer(ColorRow.java:46) at .BasicTableUI. If you want you can download my whole program here: Package calculations import java.awt.* import javax.swing.* import import public class M圜ontrolPanel extends javax.
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