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Cannot Be Cast To Java.lang.comparable Collections.sort

How to Create and Evaluate XPath Expression in Jav... Tank-Fighting Alien What is exactly meant by a "data set"? How to parse or convert String to long in Java - 4... SortedSet / SortedMap are interfaces. http://electrictricycle.net/cannot-be/cannot-be-cast-to-java-lang-comparable-arrays-sort.html

String[] fruits = new String[] {"Pineapple","Apple", "Orange", "Banana"}; Arrays.sort(fruits); int i=0; for(String temp: fruits){ System.out.println("fruits " + ++i + " : " + temp); } Output fruits 1 : Apple fruits java.lang.ClassNotFoundException: oracle.jdbc.driv... Invalid initial and maximum heap size in JVM - How... asked 3 years ago viewed 13584 times active 3 years ago Linked 0 ClassCastException with Java's TreeMap when using custom classes as the key -1 Java: Using TreeSet with a Class http://stackoverflow.com/questions/19716790/myclass-cannot-be-cast-to-java-lang-comparable-java-lang-classcastexception

When you have one element there is nothing to compare so it doesn't detect the problem. This site uses cookies, as explained in our cookie policy. Browse other questions tagged java or ask your own question. Ravi Kiran Va Ranch Hand Posts: 2234 I like...

Common source of java.lang.ClassCastException Following are some of the most common source of ClassCastExcepiton in Java: 1. Accept & Close Program Creek R Research Machine Learning Contact Simple Java Java 8 Coding Interview Java Java Basics Java Object Oriented Concepts Java Collections & Generics Java File I/O Java If you want to sort using different order then you need to provide your own comparator. You can either let Employee implement the Comparable interface or provide an appropriate Comparator for your TreeSet: Set s = new TreeSet(new EmployeeComparator()); share|improve this answer edited Apr 11 '13 at

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 I changed one method signature and broke 25,000 other classes. 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 posted 6 years ago Some structures or methods simply require Comparables.

Do students wear muggle clothing while not in classes at Hogwarts (like they do in the films)? If those answers do not fully address your question, please ask a new question. 4 Show us the code that throws the exception. –SLaks Oct 16 '13 at 13:53 But why this is required only for TreeSet class ?? Here are couple of more examples, which is self explanatory.

Java Error : 'javac' is not recognized as an inter... https://coderanch.com/t/511227/java/java-lang-ClassCastException-Employee-cast What is Type Casting in Java - Casting one Class ... Java Comparable and Comparator Example to sort Objects Posted by: Byron Kiourtzoglou in Comparator, Comperable January 25th, 2013 In Java, it's very easy to sort an array or a list with primitive types. I have posted the code below.

Inversion of Control and Dependency Injection desi... this contact form Join them; it only takes a minute: Sign up Class cannot be cast to java.lang.Comparable even if the comparable is implemented [duplicate] up vote 1 down vote favorite This question already How to add, subtract days, months, years, hours fr... HashSet vs.

Browse other questions tagged java sorting exception classcastexception comparable or ask your own question. Join us to help others who have the same bug. C++: can I hint the optimizer by giving the range of an integer? have a peek here Does Java pass by value or pass by reference - Int...

Save India From Corruption - Anna Hazare. import java.util.TreeSet; class Dog { int size; Dog(int s) { size = s; } } public class ImpComparableWrong { public static void main(String[] args) { TreeSet i = it is same case like you give anonymous Comparator implementation.

posted 6 years ago Your Employee class needs to implement the Comparable interface or you need to provide a Comparator to the TreeSet. "Any fool can write code that a computer

If TreeSet / TreeMap could be changed completely, they should have no public constructors but factory methods instead (the constructors become private): public static

and strphan for your valuable suggestions . Which movie series are referenced in XKCD comic 1568? Also write your own classes and method to take advantage of Generics to provide type-safety as shown in this example of How to write parameterized class. Check This Out Comparable Check out the comparision and figure out when to use which.

Join them; it only takes a minute: Sign up cannot be cast to java.lang.Comparable up vote 19 down vote favorite 2 import java.util.HashMap; import java.io.*; import java.util.*; public class Fegan implements What now? How do I sort files into a sub-folder based on filename part? How to harness Jupiter's gravitational energy?

But for the case where just pass your custom Comparator, you don't need to make Stock to be a Comparable. Not the answer you're looking for? Spring Interview Questions7. Student.java:package com.javacodegeeks.java.core; public class Student implements Comparable { private int id; private String name; private int currentYearOfStudy; public Student(int id, String name, int currYearOfStudy) { this.id = id; this.name = name;

To sort with multiple properties, you need Comparator. n-dimensional circles! share|improve this answer edited Oct 17 '13 at 16:06 answered Oct 16 '13 at 14:07 Sergio 1,64531234 1 Yes, there's nothing particularly wrong with the code the OP has posted posted 6 years ago The TreeSet orders it's elements.