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Treemap Containskey Not Working


But what can be wrong if equals and hashCode returns true??? (following code works: for (Entry b : fields.entrySet()) { if (b.getKey().equals(bean) && b.getValue().isChecked()){ return true; } } return false; The returned map is backed by this map, so changes in the returned map are reflected in this map, and vice-versa. Doug Morand Greenhorn Posts: 19 posted 4 years ago Thanks that makes sense. Searching for the key being present is a test for equality.

More likely you're using it. private: Any thing declared as private can't be seen outside of its class. More formally, returns true if and only if this map contains a mapping for a key k such that, (key==null ? If I'm not mistaken, TreeMap's docs even have some comments about the consistency of compare(To)() and equals(). http://stackoverflow.com/questions/18109674/java-treemap-contains-a-key-but-a-containskey-call-returns-false-even-the-key-i

Java Hashmap Containskey String Not Working

If the first key in your map --disregarding buckets -- just happens to be the one you want, then you can get the behavior you're seeing. Thread Status: Not open for further replies. Sign up for Free!

Browse other questions tagged java map treemap containskey keyset or ask your own question. Plus, fixing that wouldn't solve my current problem, correct? –smessing Apr 22 '10 at 21:31 Distinct guid != distinct hashcode, unless it is guaranteed that every guid has a Pat Farrell Rancher Posts: 4678 7 I like... Java Map Return Value The method call returns true if this map contains a mapping for the specified key.

For the compareTo claiming two instances are equal... Treemap Get Java Data Structures Other Interesting Sites Techie Park Java Design Pattern Tutorial Software Testing Wikipedia Tips2Healthy query2nataraj.blogspot.in Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark Report: Linux, NoSQL, Nginx set foundation for AWS app dominance Sumo Logic research shows its customers favor AWS for building their apps, Redis for storing data, and... Anyone know the premise of this pcb assembly note?

Specified by: floorEntryin interfaceNavigableMap<K,V> Parameters:key - the key Returns:an entry with the greatest key less than I hadn't noticed. I've printed both HashCodes of the respected Locations being compared, and they were identical. If you want to do a sort, just use the Collections.sort() that takes a Comparitor, and pass in another Comparitor that does it the second way.

Treemap Get

More likely you're using it. https://www.tutorialspoint.com/java/util/treemap_containskey.htm Specified by: pollLastEntryin interfaceNavigableMap<K,V> Returns:the removed last entry of this map, or null if this map Java Hashmap Containskey String Not Working Specified by: containsValuein interfaceMap<K,V> Overrides: containsValuein classAbstractMap<removein interfaceMap<K,V> Overrides: removein classAbstractMap<navigableKeySetin interfaceNavigableMap<K,V> Returns:a navigable set view of the keys in this mapSince: 1.6 descendingKeySet

Otherwise, the scenario ought to be small enough for you to publish the objects and/or their respective hashcode and equals method.

Sorting includes testing for equality, and your Comparator defines the conditions under which two nodes are equal. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. Furthermore, all such keys must be mutually comparable: k1.compareTo(k2) must not throw a ClassCastException for any keys k1 and k2 in the map. Continue to site » JavaScript is disabled on your browser.

Specified by: pollFirstEntryin interfaceNavigableMap<K,V> Returns:the removed first entry of this map, or null if this map The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. Jeff Verdegan Bartender Posts: 6109 6 I like... Trying out some other random case doesn't answer the question at all. –Dennis Meng Aug 7 '13 at 17:33 @DennisMeng I am curious to learn about such specific pair.

But I don't change the fields use in hashCode (equals) –agad Feb 6 '14 at 11:13 add a comment| up vote 8 down vote As Arnaud Denoyelle points out, modifying a Storing passwords in access-restricted Google spreadsheets? Note that the ordering maintained by a tree map, like any sorted map, and whether or not an explicit comparator is provided, must be consistent with equals if this sorted map So this means it's using natural ordering, which in this case means using Node.compareTo() correct?

Specified by: headMapin interfaceNavigableMap<K,V> Parameters:toKey - high endpoint of the keys in the returned mapinclusive - My problem is when I try to execute: public containsNode(n){ for (Node x : nodes.keySet()) { System.out.println("HASH CODE: "); System.out.print(x.hashCode() == n.hashCode()); System.out.println("EQUALS: "); System.out.print(x.equals(n)); System.out.println("CONTAINS: "); System.out.print(nodes.containsKey(n)); System.out.println("N: " + But it is the birthday problem on a planet with four billion days in the year. Jeff Verdegan Bartender Posts: 6109 6 I like...

Fail-fast iterators throw ConcurrentModificationException on a best-effort basis. For instance, checking for something being contained should be consistent with it being equal to something else in your tree as per the comparator. extends V>m) Constructs a new tree map containing the same mappings and using the same ordering as the specified sorted map. Could someone explain what knot theory is about, exactly?

For details see http://eyalsch.wordpress.com/2009/11/23/comparators/. --EDIT-- Now that you provided your compareTo implementation, is is clear that it has a flaw. Jeff Verdegan Bartender Posts: 6109 6 I like... The answer suggested by me is that they do not match. Locking plane for a long period Is there a class like Optional but for non-optionals?

extends K,? The returned map supports all optional map operations that this map supports. If the user attempts to put a key into the map that violates this constraint (for example, the user attempts to put a string key into a map whose keys are The behavior of a sorted map is well-defined even if its ordering is inconsistent with equals; it just fails to obey the general contract of the Map interface.

I encountered this issue before in code I inherited, where the node is in the tree but due to the int overflow problems the compareTo function lost its transitive property, causing go

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