exception in thread main java.lang.nullpointerexception java error Curtin Oregon

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exception in thread main java.lang.nullpointerexception java error Curtin, Oregon

A possible solution would be initialize it when declaring it: double a[] = new double[PUT_A_LENGTH_HERE]; //seems like this constant should be 7 IMO more important than solving this exception, is the ht.names = ht.hash.keys(); while (ht.names.hasMoreElements()) { str = (String) ht.names.nextElement(); System.out.println(str + ": " + /*hash.get(str)*/ ht.getString(str)); } System.out.println(); } catch (IOException e) { System.out.print(e.getMessage()); } } } The problem is What's the most recent specific historical element that is common between Star Trek and the real world? This was a tutorial on how to handle Java's NullPointerException.Don't forget to check out our Academy premium site for advanced Java training!

posted 2 years ago fred rosenberger wrote:It actually says more than just what you listed...it tells you the exact line where the problem is: Exception in thread "main" java.lang.NullPointerException at TestBox.go(TestBox.java:9) Thread: I get the error Exception in thread "main" java.lang.NullPointerException? posted 2 years ago dear alll three of you I have just read your comments, thanks the problem is that null won't be printed. Thus, the static fields and methods are not associated with objects, rather with the name of the class.For example, the following code does not throw a NullPointerException:TestStatic.java: class SampleClass {

Nitpick war! One value object can have is null, which is also default value of an object, when created. Yes, using the properties class is fine. Email address: Why do we need the null value?As already mentioned, null is a special value used in Java.

April 7, 2013 at 8:50 PM I @m The [email protected] I @M said... Create a "k" variable. At first I was afraid I'd be petrified UPDATE heap table -> Deadlocks on RID With the passing of Thai King Bhumibol, are there any customs/etiquette as a traveler I should A NullPointerException is thrown when an application is trying to use or access an object whose reference equals to null.

share|improve this answer answered Mar 4 '11 at 17:20 hvgotcodes 73.2k16131192 add a comment| up vote 1 down vote TheCard[] theDeck = null; ? Why does argv include the program name? Is the NHS wrong about passwords? Though core of the problem is not how you place your code, but that certain lines (those two in constructor) are never get called with the approach you used to organize

posted 2 years ago He is saying int is a (primitive)type so is singular, while you typed wrong ;) int types We coders are all geniuses. Continue with the execution of the method, only when the arguments are properly checked. Trade[] bluechips = null; int length = bluechips.length; //array is null here Exception in thread "main" java.lang.NullPointerExceptionat test.NullPointerExceptionTest.main(NullPointerExceptionTest.java:85) 5) Example of NPE when accessing element of a null array. You can also be a guest writer for Java Code Geeks and hone your writing skills!

Unit TestsUnit tests can be extremely useful while testing the functionality and correctness of your code. 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InterfaceHashMapHashSetHashtableIteratorjarLinkedHashMapLinkedHashSetLinkedListListLocaleloggingMissingResourceExceptionObserverOptionalPreferencesPriorityQueuePropertiesQueueRandomregexMatcherPatternPatternSyntaxExceptionResourceBundleScannerSetStringTokenizerTimerTimerTaskTreeMapTreeSetVectorzipFileInputStreamGZIPOutputStreamZipInputStreamZipOutputStreamxmlbindJAXBContextDOMJDOMparsersDocumentBuilderDocumentBuilderFactorySAXParserSAXtransformTransformerTransformerFactoryXPathDesktop JavaaccessibilityawtdatatransferdndeventfontgeomGridLayoutimageprintIDEEclipseIntelliJ IDEANetBeansimageioJavaFXComboBoxDatePickerDialogEventFXMLListViewSceneChartImageTableViewTextJFreeChartprintsoundswingJButtonJCheckboxJColorChooserJDialogJFileChooserJFrameJLabelJLayerJListJRadioButtonJScrollPaneJSplitPaneJTabbedPaneJTableJTextFieldxuggleryoutubeEnterprise JavaApache CamelApache HadoopApache HTTP So I use "startWith" method, but when runnig the code, I see error: Exception in thread "main" java.util.NoSuchElementException at java.util.Scanner.throwFor(Scanner.java:907) at java.util.Scanner.next(Scanner.java:1416) at io.HashTableDemo.main(MyHashTable.java:41) Java Result: 1 Here is the code: You have int type!

Java Assertions are implemented with the assert keyword and throw an AssertionError.Notice that you must explicitly enable the assertion flag of the JVM, by executing it with the –ea argument. Create methods that return empty collections instead of nullA very good technique is to create methods that return an empty collection, instead of a null value. posted 2 years ago 1 Giovanni Montano wrote:so... It IS.

In your example you were trying to assign null to int variable, not null to zero. The literal may be a String or the element of an Enum. String line = inp.readLine()if(line != null){ Sa[i] = line;}else { System.out.println( i + "th line is : "+ line);}readLine() method returns null if there is no more line to read, which Of course, it could be the case that you have defined your own class called integer, inwhich case i would be a reference variable as you say.

I made an array of 10 cars, and am setting the make, color, and year of each of them. as a note, java convention is that variable names be camel cased. Just make sure the variable is not null before being used. It works fine for 15-16 threads, then this thing starts to occure.

Besides, I want to ignore the lines starting with "#" sign and not to add them to the hash table. Before you try to do this: cars[0].setMake("Toyota"); you should first initialize your Car object like this: cars[0] = new Car(); // or use any other appropriate constructor same applies to rest Join them; it only takes a minute: Sign up Java: (Error) Exception in thread “main” java.lang.NullPointerException at Main.main(Main.java:14) [duplicate] up vote 1 down vote favorite This question already has an answer Just a convention.

And what about this problem: I want to ignore the lines starting with "#" sign and not to add them to the hash table. Use the contains(), containsKey(), containsValue() methodsIf your application code makes use of collections, such as Maps, consider using the contains, containsKey and containsValue methods. You can post the link of ideone where you have written your code. Particularly if the nitpick war is more fun than the rest of the thread Post Reply Bookmark Topic Watch Topic New Topic Similar Threads Why compiler allows a null being

Android UI Designand many more .... share|improve this answer answered Mar 4 '11 at 17:48 user634626 add a comment| up vote 1 down vote Null Pointer Exception is a situation in code where you try to access/ There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors Paweł Baczyński Bartender Posts: 1845 34 I like... Used another text editor to make the properties.

Its best to avoid NullPointerException by applying careful or defensive coding technique and null safe API methods. How do computers remember where they store things? And what about "double-click"? That's all on What is java.lang.NullPointerException, When it comes and how to solve it.

Since it's a reference type, its default value is null. Then you assign that to an int. Developing web applications for long lifespan (20+ years) How to mount a disk image from the command line? ht.names = ht.hash.keys(); while (ht.names.hasMoreElements()) { str = (String) ht.names.nextElement(); System.out.println(str + ": " + /*hash.get(str)*/ ht.getString(str)); } System.out.println(); } catch (IOException e) { System.out.print(e.getMessage()); } } } But when I

From this line, other lines will be similar to tell you where the error arose. JVM Troubleshooting Guide3. Post Java 5, Another common cause of NullPointerException is Autoboxing. The execution’s stack trace is provided by the JVM, in order to enable the debugging of the application.

If Dumbledore is the most powerful wizard (allegedly), why would he work at a glorified boarding school? Browse other questions tagged java or ask your own question. What is NullPointerException in Java NullPointerException in Java is nothing but an error or precisely an exception which occurs if we tried to perform any operation on object which is null. The operator has the form: boolean expression ?

It essentially means that object reference variable is not pointing anywhere and refers to nothing or ‘null’.