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Integer Cannot Be Cast To Comparable

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Istvan Kovacs Ranch Hand Posts: 100 posted 6 years ago Krep Lock wrote: public class MyArrayList extends MyListADT { T[] list = (T[]) new Object[maxSize]; } Exception in thread Can you show us the relevant parts of MyListADT? public class IntDriver { public static void main(String[] args) { Scanner keyboard = new Scanner(System.in); //Creating variables int data; boolean check = false; int choice; int size = 5; int increment share|improve this answer edited Sep 14 '14 at 18:16 answered Sep 14 '14 at 17:50 Chaitanya 5,529114787 add a comment| up vote 0 down vote It seems to me like whatever this content

Polyglot Anagrams Robbers' Thread Build me a brick wall! Mapping network drive in Windows XP and 7 - net us... Naturally, this code doesn't make sense; you would be putting a Long into your heap of Elements, and that's just not right. Even if you do that, it will fail if the array is passed to the outside world (you cannot cast Comparable[] into String[]). http://stackoverflow.com/questions/2112343/java-integer-obj-cant-cast-to-comparable

Cannot Be Cast To Java.lang.comparable Treeset

GO OUT AND VOTE Alternating Fibonacci Why is (a % 256) different than (a & 0xFF)? FAQs Search RecentTopics FlaggedTopics HotTopics Best Topics Register / Login Win a copy of Cybersecurity Lexicon or Cyber-Physical Attack Recovery Procedures: A Step-by-Step Preparation and Response Guide in the Security forum! The range to be sorted extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be sorted is empty.) All elements in this range must implement the Build me a brick wall!

Here's my best try so far: public class MyArrayList extends MyListADT { // lots of stuff public static > T smaller(T x, T y) { if(x.compareTo(y) more hot questions question feed lang-java about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation BlockingQueue in Java - ArrayBlockingQueue vs Link... Java.lang.classcastexception Ljava.lang.object Cannot Be Cast To The cast succeeds because Number[], just like Object[], is a supertype of the actual Integer[] value.

Consider this code: Comparable[] foo = new Comparable[size]; foo[0] = Long.valueOf(123L); Element[] heap = (Element[]) foo; Element thisFails = heap[0]; // this isn't safe! Color substitution in a BufferedImage Ubuntu 16.04 installer cant see SSD drive Polyglot Anagrams Cops' Thread A guy scammed me, but he gave me a bank account number & routing number. What I meant was this: Stack stack = new Stack(10); stack.push("Hello World"); T[] array = stack.array; // called from inside class Stack itself ;) Object[] objects = array; // allowed since http://stackoverflow.com/questions/27591061/ljava-lang-object-cannot-be-cast-to-ljava-lang-integer When you do things right, people won't be sure you've done anything at all.

On which point(s) in a jet engine does the reaction force act? Create Generic Array Java Can a text in Latin be understood by an educated Italian who never had any formal teaching of that language? if you just put Stock object into any sorted collection, you will see such exception and need to implement Comparable interface. Could you perhaps post an SSCCE that shows the behavior you describe?

Ljava Lang Object Cannot Be Cast To Ljava Lang Comparable

Browse other questions tagged java or ask your own question. As Italian citizens, what legal documents are we supposed to carry when traveling to Ireland? Cannot Be Cast To Java.lang.comparable Treeset How do I deal with my current employer not respecting my decision to leave? Object Cannot Be Cast To Comparable In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms

The declaration should be public class MyArrayListhttp://tcsmacs.net/cannot-be/lang-integer-cannot-be-cast-to.php ClassCastException is result of bad design and bad coding. public class Dog extends Animal // a Dog IS A Animal, but no dog can be compared :wink: public class Student extends Person implements Comparable // a Student IS A Person Not the answer you're looking for? Implement Comparable

here is the unexpected exception thrown ": java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Double" November 5, 2015 at 7:24 AM Manjula said... [Ljava.lang.String; cannot be cast to java.util.Collection August 21, 2016 Of course not. share|improve this answer answered Dec 21 '14 at 16:27 Everv0id 828721 Random ran = new Random(); Stack st = new Stack(); st.push(ran.nextInt(100)); –Avneesh Dec 21 '14 at 16:30 1 have a peek at these guys Check if an item is in a nested list Why is Professor Lewin correct regarding dimensional analysis, and I'm not?

What now? Treeset Comparator super T>> extends MyListADTThat "? Rob Spoor Sheriff Posts: 20720 68 I like...

Though we can minimize and avoid java.lang.ClassCastException in Java by using Generics and writing type-safe parameterized classes and method, its good to know real cause of ClassCastException and How to solve

Janeice DelVecchio Saloon Keeper Posts: 1809 12 I like... public T[] toArray(T[] a) { // Estimate size of array; be prepared to see more or fewer elements int size = size(); T[] r = a.length >= size ? 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" Java Comparable On which point(s) in a jet engine does the reaction force act?

The method compareTo you are overidding in it should have a Fegan object as a parameter whereas you are casting it to a FoodItems. You can even expose the Object[], but you have to claim its true type - Object[]. Thanks for any tips on this. check my blog What is a Rotary Club Word™?

Now add this method to your stack, and modify main: public T[] toArray() { T[] destination = (T[])new Object[array.length]; System.arraycopy(array, 0, destination, 0, array.length); return destination; } public static void main(String[] How to find duplicate records in a table on databa... River Crossing Puzzle In Revelation 19:16, of which kings is Jesus king? Maybe it's nitpicking, but I don't agree with the underlined reasoning: you cannot "add anything", as the cast will fail.

public Object[] honestToArray() { Object[] destination = new Object[array.length]; System.arraycopy(array, 0, destination, 0, array.length); return destination; } private static void test2() { Stack stack = new Stack(10); Object[] asArray = stack.honestToArray(); As Italian citizens, what legal documents are we supposed to carry when traveling to Ireland? They're 2 separate actions. Object() In Java.lang.Object Cannot Be Applied To (java.l Java.lang.ClassCastException: AppletUI Cannot Be Cast To GUI Short Cannot Be Cast To Int, And Int Cannot Be Cast To Short - Trying To

A carefully designed program will never see ClassCastException. Since due to polymorphism in Java an Object instance can hold any type of Object but you can only cast between same type. You need to change that to: Object[] a = new Object[] {Integer.valueOf(1);}; java.util.Comparable x = (java.util.Comparable) a[0]; Even better, you should rename your Comparator class to something that doesn't collide with more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

Clear\n4. I also know sth like the following is allowed: heap = (K[]) new Comparable[capacity]; –user2692465 Aug 17 '13 at 19:31 1 Have you tried Element[] heap = (Element[]) posted 6 years ago Istvan Kovacs wrote:Even if you do that, it will fail if the array is passed to the outside world (you cannot cast Comparable[] into String[]). Rob Spoor Sheriff Posts: 20720 68 I like...

Here is all the code which created the problem - public class StackMain { public static void main(String[] args) { MinMaxStack minMaxStack = new MinMaxStack(); Random ran = new Random(); for How to use? How to create and modify Properties file form Java... Space of real sequences with finitely many nonzero elements is a Banach space?

Why "silver-tongued" for someone who is convincing? super T>> extends MyListADTThat "? I got it to work with the regular test program and a custom Rocket object I made for testing. new TreeMap(new Comparator() { public int compare(MyVertex o1, MyVertex o2) { //comparison logic goes here } }); Why is this necessary?