Home > Cannot Be > Ljava Lang Object Cannot Be Cast To Ljava Lang Comparable

Ljava Lang Object Cannot Be Cast To Ljava Lang Comparable

Contents

Exit"); choice = keyboard.nextInt(); switch(choice) { case 1: System.out.println("Type the int data to store in array location."); data = keyboard.nextInt(); Integer insertObj = new Integer(data); b.insert(insertObj);// Here's where I lay "insertObj" You cannot cast an array of the supertype into an array of the subtype. Should you change a thermostat when changing your water pump How can an advanced (circa 7000 AD) spacefaring human civilization be prevented from entering its own solar system? Polyglot Anagrams Cops' Thread What is the most someone can lose the popular vote by but still win the electoral college? weblink

Examples Java Code Geeks is not connected to Oracle Corporation and is not sponsored by Oracle Corporation. However, you cannot directly instantiate T[], the following does not compile (as you have probably found out already): T[] list = new T[maxSize]; The only way to get around this is Ballpark salary equivalent today of "healthcare benefits" in the US? Ravi Kiran Va Ranch Hand Posts: 2234 I like... http://stackoverflow.com/questions/18292282/java-lang-classcastexception-ljava-lang-comparable-cannot-be-cast-to

Ljava Lang Object Cannot Be Cast To Ljava Lang Comparable

current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. This usually happens when someone inadvertently makes elements public, or implements a method that returns it to the outside like E[] getElements() { return elements; } Then on the outside of JUnit Tutorial for Unit Testing4.

You can cast any non-primitive array to Object[]. JCGs serve the Java, SOA, Agile and Telecom communities with daily news written by domain experts, articles, tutorials, reviews, announcements, code snippets and open source projects.DisclaimerAll trademarks and registered trademarks appearing Many of advanced Java IDE like Eclipse and Netbeans will give you hyperlink to navigate till culprit line number in Java file. Treeset Comparator Generics are designed to write type-safe code and provides compile time checks which tends to violate type-safety.

For instance, a very simple stack implementation (no bounds checking): public class Stack { T[] array; int index; public Stack(int size) { array = (T[])new Object[size]; index = 0; } public Cannot Be Cast To Java.lang.comparable Treeset That allows me to technically create a SortedSet implementing class which uses the system hash code for ordering. My AccountSearchMapsYouTubePlayNewsGmailDriveCalendarGoogle+TranslatePhotosMoreShoppingWalletFinanceDocsBooksBloggerContactsHangoutsEven more from GoogleSign inHidden fieldsSearch for groups or messages NewsKnowledge BaseTutorialsResourcesCoursesWhitepapersDealsJob BoardAboutAbout JCGsAdvertisingTerms of UsePrivacy Policy Examples Java Code Geeks Java Examples and Code Snippets AndroidcoreactivityanimationappActionBarActivityFragmentListActivityBluetoothBluetoothAdaptercameracontentBroadcastReceiverContentProviderIntentSharedPreferencesdatabasesqliteSQLiteDatabaseEmailgoogle mapsgraphicsCanvashardwareCameraSensorlocationmediaAudioManagerMediaRecordernetworkosAsyncTaskHandlerSystemClockPackageManagerpreferenceproviderContactsContractpublishingServicesockettelephonyPhoneStateListenerSmsManagerTelephonyManagertext-to-speechThreaduiAlertDialogAnalogClockButtonCheckBoxcomponentDatePickerDialogDigitalClockDrag and DropEventsExpandableListViewGridViewHorizontalScrollViewImageButtonImageViewLinearLayoutListViewNotificationsPasswordProgressBarProgressDialogRadioButtonRadioGroupRatingBarRelativeLayoutScrollViewSelectorSettingsSpinnerSurfaceViewTextBoxTimePickerToastToggleButtonWebViewviewMenuOnClickListenerViewPagerwidgetAutoCompleteTextViewEditTextFrameLayoutSeekBarSlidingDrawerStackViewTextViewViewFlipperxmlgamescanvasmain I know ArrayList works, but here I need something as simple as Element[], which is not directly supported by Java.

Zener diodes in glass axial package - not inherently shielded from photoelectric effect? Java Comparable How to attach source in eclipse for Jars, debuggin... super T>> extends MyListADTThat "? In general, even though Java has namespacing, you should try to avoid your classes having the same name as the system classes to avoid exactly this kind of confusion.

Cannot Be Cast To Java.lang.comparable Treeset

Join them; it only takes a minute: Sign up Ljava.lang.Object; cannot be cast to [Ljava.lang.Integer up vote 3 down vote favorite 2 I have written a generic class and below is How to fix java.lang.classcastexception cannot be ... Ljava Lang Object Cannot Be Cast To Ljava Lang Comparable Personally i wouldn't make it static - it seems to me that it would be perfectly reasonable that two different co-existent instances of the class could want to sort on different Object Cannot Be Cast To Comparable Post Reply Bookmark Topic Watch Topic New Topic programming forums Java Java JSRs Mobile Certification Databases Caching Books Engineering Languages Frameworks Products This Site Careers Other all forums Forum: Beginning Java

Integer number = (Integer) stringObject; java.lang.classcastexception java.lang.string cannot be cast to java.util.date :This error will come when you cast String to Date in Java, since both are not related to each have a peek at these guys No Exceptions. –tobias_k Dec 21 '14 at 16:18 | show 12 more comments 5 Answers 5 active oldest votes up vote 3 down vote accepted Here is the most-minimal code necessary That would not require a comparator (so comparator() returns null) but the elements are still not Comparable. It's an Object[] and the cast will fail. Create Generic Array Java

Here is the relevent portion of MyListADT: public abstract class MyListADT implements Cloneable { protected int length; protected int maxSize; protected T[] list; public MyListADT(int size) { maxSize = Email address: Join Us With 1,240,600 monthly unique visitors and over 500 authors we are placed among the top Java related sites around. That's indeed not possible, but I never said it was. check over here Krep Lock Ranch Hand Posts: 43 posted 6 years ago Well, I confess I am working on homework, so using the library is not an option for this feature.

SQL query to copy, duplicate or backup table in My... Compareto Java Not the answer you're looking for? So the cast is, theoretically, incorrect.

super K>,V> create() { return new TreeMap(); } public static create(Comparator

With T extends Comparable, the compiler will figure out that whatever type T is, it will be a subtype of Comparable, and will use that as the runtime type. TreeSet and TreeMap use sorting for their internal storage. Black magic java generics ant pkg won't work for installing I2P Comparable - must override compareTo()??? Java Queue Maybe it's nitpicking, but I don't agree with the underlined reasoning: you cannot "add anything", as the cast will fail.

Alternating Fibonacci Space of real sequences with finitely many nonzero elements is a Banach space? Your code works; inserting the following main method into your code prints the expected result: public static void main(String[] args) { Stack stack = new Stack(10); stack.push("text"); String popped = stack.pop(); add a comment| 5 Answers 5 active oldest votes up vote 11 down vote accepted How do I get MyVertex types to be casted to Comparables? http://pgexch.com/cannot-be/java-lang-classcastexception-ljava-lang-object-cannot-be-cast-to.html US Election results 2016: What went wrong with prediction models?

I've retagged the question with the homework tag. –Powerlord Jan 21 '10 at 20:16 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up Rob Spoor Sheriff Posts: 20720 68 I like... How to find duplicate records in a table on databa... It can be best explained with an example.

Post Reply Bookmark Topic Watch Topic New Topic programming forums Java Java JSRs Mobile Certification Databases Caching Books Engineering Languages Frameworks Products This Site Careers Other all forums Forum: Java in asked 3 years ago viewed 9939 times active 4 months ago Upcoming Events 2016 Community Moderator Election ends Nov 22 Visit Chat Linked 4 Java: SortedMap, TreeMap, Comparable? Should I report it? As such, that code doesn't make sense.

ClassCastException is result of bad design and bad coding. A carefully designed program will never see ClassCastException. You can also be a guest writer for Java Code Geeks and hone your writing skills! SCJP 1.4 - SCJP 6 - SCWCD 5 - OCEEJBD 6 - OCEJPAD 6 How To Ask Questions How To Answer Questions Istvan Kovacs Ranch Hand Posts: 100 posted 6

Java Interview Questions6. Can I use that to take out what he owes me? I continue to receive the error: "Exception in thread "main" java.lang.ClassCastException: java.lang.Integer cannot be cast to Comparable". pbl just means a variable that would define whether you wanted to order on the String field or the double field.

Career OpportunitiesKnowledge BaseCoursesNewsResourcesTutorialsWhitepapersThe Code Geeks Network.NET Code GeeksJava Code GeeksSystem Code GeeksWeb Code GeeksHall Of FameAndroid Alert Dialog ExampleAndroid OnClickListener ExampleHow to convert Character to String and a String to Character super T>> implements Stack { private final int DEFAULT_CAPACITY = 50; private int top; private T[] elements; @SuppressWarnings("unchecked") public ArrayStack() { this.elements = (T[]) new Comparable[DEFAULT_CAPACITY]; this.top = 0; } } How to create thread safe Singleton in Java - Java... Possible repercussions from assault between coworkers outside the office How to delete the lines from a file that do not contain dot?

Janeice DelVecchio Saloon Keeper Posts: 1809 12 I like... Seems pretty straightforward, but I've been working on it for hours now.