Java Tokenizer

[n3p3nthess]

Heeft iemand een idee wat er mis is met de volgende code?

Code: [Selecteer]

public void readData() throws IOException
{
BufferedReader inFile = new BufferedReader(new FileReader(fileName));

String line;
while((line = inFile.readLine()) != null)
{
StringTokenizer st = new StringTokenizer(line, "/");
String tmpName = st.nextToken();
double tmpLength = Double.valueOf(st.nextToken()).doubleValue() / 100;
double tmpMass = Double.valueOf(st.nextToken()).doubleValue();

humans.add(new BodyMassIndex(tmpName, tmpLength, tmpMass, -1));
}
humans.toArray(unsortedHumans);

setDataReaded(true);
setChanged();
notifyObservers();
}
Ik krijg volgende foutmeldingen:

Code: [Selecteer]

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at h9_BestandssysteemIO.HumanModel.uhAsString(HumanModel.java:87)
at h9_BestandssysteemIO.HumanUDPanel.update(HumanUDPanel.java:39)
at java.util.Observable.notifyObservers(Observable.java:142)
at java.util.Observable.notifyObservers(Observable.java:98)
at h9_BestandssysteemIO.HumanModel.readData(HumanModel.java:58)
at h9_BestandssysteemIO.ReadDataController.actionPerformed(ReadDataController.java:28)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2351)
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:6374)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6139)
at java.awt.Container.processEvent(Container.java:2085)
at java.awt.Component.dispatchEventImpl(Component.java:4736)
at java.awt.Container.dispatchEventImpl(Container.java:2143)
at java.awt.Component.dispatchEvent(Component.java:4566)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4621)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4282)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4212)
at java.awt.Container.dispatchEventImpl(Container.java:2129)
at java.awt.Window.dispatchEventImpl(Window.java:2478)
at java.awt.Component.dispatchEvent(Component.java:4566)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:680)
at java.awt.EventQueue.access$000(EventQueue.java:86)
at java.awt.EventQueue$1.run(EventQueue.java:639)
at java.awt.EventQueue$1.run(EventQueue.java:637)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$2.run(EventQueue.java:653)
at java.awt.EventQueue$2.run(EventQueue.java:651)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:650)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)


[Rachid]

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
   at h9_BestandssysteemIO.HumanModel.uhAsString(HumanModel.java:87)

Er is een NullPointerException op regel 87. De fout zit dus op regel 87 (dat kan ik hier niet terugvinden).

NullPointerException houdt in dat je bijv. een methode aanroept op een object dat null is.

Object bla = null;
bla.toString();  <- gooit NullPointerException

[erik1984]

Het komt misschien door die aanroep st.NextToken(). Je gaat er vanuit dat er 3 tokens zijn maar als dat niet zo is krijg je wellicht de NullPointerException.