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2. Get keys from HashMap in Java - Stack Overflow

   stackoverflow.com/questions/10462819

   java,util.HashMap is a class, not a package, and there is nothing here that wasn't here five years ago

3. java - How to for each the hashmap? - Stack Overflow

   stackoverflow.com/questions/4234985

   Use of generic args on the outer HashMap would seem to indicate Java 5 or later. [[ But I did wonder about what Java this was since the inner HashMap didn't have generic args and there was an array access done on a HashMap... but its just some "pseudo" code for conveying the question. ]] –

4. Java Hashmap: How to get key from value? - Stack Overflow

   stackoverflow.com/questions/1383797

   If you want to rely on the Java Collections API, you will have to ensure the 1:1 relationship between keys and values at the time of inserting the value into the map.

5. sorting - How to sort a HashMap in Java - Stack Overflow

   stackoverflow.com/questions/780541

   A few more points: First, there are two decisions you need to make: (1) Whether you want to sort by the values, or by the keys, (2) Whether you have control over the collection at the start, so you can use built-in sorting, vs. when you're handed existing Maps and just want to iterate through them in some order.

6. collections - Printing HashMap In Java - Stack Overflow

   stackoverflow.com/questions/5920135

   HashMap<K,V> HM = new HashMap<>(); //empty System.out.println(HM); //prints key value pairs enclosed in {} This works because the toString()method is already over-ridden in the AbstractMap class which is extended by the HashMap Class More information from the documentation . Returns a string representation of this map.

7. java - How to get values and keys from HashMap? - Stack Overflow

   stackoverflow.com/questions/16246821

   I'm writing a simple edit text in Java. When the user opens it, a file will be opened in JTabbedPane. I did the following to save the files opened: HashMap<String, Tab> hash = new HashMap<String, Tab>(); Where Tab will receive the values, such as: File file, JTextArea container, JTabbedPane tab. I have a class called Tab:

8. java - How to directly initialize a HashMap (in a literal way)? -...

   stackoverflow.com/questions/6802483

   note that Guava's ImmutableMap implementation differs from Java's HashMap implementation (most notably it is immutable and does not permit null keys/values) for more info, see Guava's user guide article on its immutable collection types

9. java - Key existence check in HashMap - Stack Overflow

   stackoverflow.com/questions/3626752

   If the HashMap is being accessed very frequently, then checking for the key existence at every access will lead to a large overhead. A map with 1.000 entries is not a huge map. As well as a map with 5.000 or 10.000 entries.

10. java - How to update a value, given a key in a hashmap ... -...

    stackoverflow.com/questions/4157972

    The simplified Java 8 way: map.put(key, map.getOrDefault(key, 0) + 1); This uses the method of HashMap that retrieves the value for a key, but if the key can't be retrieved it returns the specified default value (in this case a '0'). This is supported within core Java: HashMap<K,V> getOrDefault(Object key, V defaultValue)

11. java - Iterate through a HashMap - Stack Overflow

    stackoverflow.com/questions/1066589

    Since all maps in Java implement the Map interface, the following techniques will work for any map implementation (HashMap, TreeMap, LinkedHashMap, Hashtable, etc.) Method #1 : Iterating over entries using a For-Each loop.