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Cannot Be Cast To Java.lang.comparable Treeset

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Consider Stack st = new Stack<>(); instead. Many of advanced Java IDE like Eclipse and Netbeans will give you hyperlink to navigate till culprit line number in Java file. How to append text into File in Java - FileWriter ... ThreadLocal in Java. navigate here

Alternating Fibonacci Ballpark salary equivalent today of "healthcare benefits" in the US? 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 = Your example goes the other way around - casting the Object[] back to T[] outside the class. Element thisFails = heap[0]; // this isn't safe! http://stackoverflow.com/questions/2112343/java-integer-obj-cant-cast-to-comparable

Cannot Be Cast To Java.lang.comparable Treeset

Rob Spoor Sheriff Posts: 20720 68 I like... posted 6 years ago Istvan Kovacs wrote:The problem is that you create an Object[], which cannot be cast to T[]. public class MyVertex implements Comparable { @Override public int compareTo(MyVertex o) { // do the comparison logic } } Other option is to pass a Comparator Object to TreeMap http://docs.oracle.com/javase/1.5.0/docs/api/java/util/TreeMap.html#TreeMap(java.util.Comparator) share|improve Is adding the ‘tbl’ prefix to table names really a problem?

You have method compareTo(); so just add implements Comparable to your class MyVertex . Actually you can (it's a warning after all, not an error), but only if the rest of the code ensures that every interaction with the array respects the T type OK, I also realized I was making way too big a production of comparing list objects and tightened that up. Java.lang.classcastexception Ljava.lang.object Cannot Be Cast To Should I report it?

How to find second highest or maximum salary of Em... Ljava Lang Object Cannot Be Cast To Ljava Lang Comparable Copyright 2001 Pavel Kouznetsov. // Jad home page: http://www.kpdus.com/jad.html // Decompiler options: packimports(3) // Source File Name: MyListADT.java public abstract class MyListADT implements Cloneable { public MyListADT(int i) { maxSize = What does "there lived here then" mean? http://stackoverflow.com/questions/27591061/ljava-lang-object-cannot-be-cast-to-ljava-lang-integer On which point(s) in a jet engine does the reaction force act?

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? Create Generic Array Java It is saying that the method sort is not applicable and that it cannot be cast. How can an advanced (circa 7000 AD) spacefaring human civilization be prevented from entering its own solar system? In Revelation 19:16, of which kings is Jesus king?

Ljava Lang Object Cannot Be Cast To Ljava Lang Comparable

You can cast an Object[] into an Object[], as T will be erased into Object (or, if T extends Comparable, then into Comparable). this website However, your Stack class does not have such a method. Cannot Be Cast To Java.lang.comparable Treeset I so love it when I'm right. Object Cannot Be Cast To Comparable class Stack { private Object[] elements; private int size; Stack(int len) { elements = new Object[len]; } void push(E e) { elements[size] = e; size++; } E pop() { @SuppressWarnings("unchecked"); E

Even if you do that, it will fail if the array is passed to the outside world (you cannot cast Comparable[] into String[]). check over here Would we find alien music meaningful? 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 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 Implement Comparable

On which point(s) in a jet engine does the reaction force act? super T>> extends MyListADTThat "? element is an array . http://pgexch.com/cannot-be/ljava-lang-object-cannot-be-cast-to-ljava-lang-comparable.html What is Referential Integrity in Database or SQL -...

Not the answer you're looking for? Treeset Comparator Largest\n6. Difference between Primary key vs Foreign key in t...

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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 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. Browse other questions tagged java or ask your own question. Java Comparable What is this line of counties voting for the Democratic party in the 2016 elections?

Browse other questions tagged java sorting exception classcastexception comparable or ask your own question. if you just put Stock object into any sorted collection, you will see such exception and need to implement Comparable interface. When you write Stack st = new Stack();, java understands it as Stack st = new Stack();, it causes your Ljava.lang.Object; cannot be cast to [Ljava.lang.Integer error. http://pgexch.com/cannot-be/java-lang-classcastexception-java-lang-string-cannot-be-cast-to-object.html How do I deal with my current employer not respecting my decision to leave?

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 Are “la malplej juna” and “la plej maljuna” entirely interchangeable? Other Java debugging and troubleshooting tutorials How to solve java.util.NoSuchElementException in Java JDBC - java.lang.ClassNotFoundException: com.mysql.jdbc.Driver Solution How to fix java.io.NotSerializableException: org.apache.log4j.Logger Error in Java How to fix java.sql.SQLException: Invalid column Generics are designed to write type-safe code and provides compile time checks which tends to violate type-safety.

Can I use that to take out what he owes me? java.lang.classcastexception java.util.arraylist cannot be cast to java.util.mapjava.lang.classcastexception ljava.lang.object cannot be cast to ljava.lang.comparablejava.lang.classcastexception ljava.lang.object cannot be cast to ljava.lang.integerjava.lang.classcastexception ljava.lang.object cannot be cast to java.util.listjava.util.arraylist cannot be cast to java.lang.comparable Example for a commutative subring of a non-commutative ring What is this line of counties voting for the Democratic party in the 2016 elections? A guy scammed me, but he gave me a bank account number & routing number.

You cannot refer to a superclass (or interface) "object" through a subclass reference. How to Split String in SQL Server and Sybase How to get current date, month, year and day of we... Actually you can (it's a warning after all, not an error), but only if the rest of the code ensures that every interaction with the array respects the T type. By using Generics in Collection classes and other places you can safely minimize java.lang.ClassCastException in Java.

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