Jul 1, 2009 · Since all maps in Java implement the Map interface, the following techniques will work for any map implementation (HashMap, TreeMap, LinkedHashMap, Hashtable, etc.) …

A HashMap can hold any object as a value, even if it is another HashMap. Eclipse is suggesting that you declare the types because that is the recommended practice for Collections. under …

May 5, 2012 · 1 To get keys in HashMap, We have keySet () method which is present in java.util.Hashmap package. ex :

Get the highest values in a hashmap in java [duplicate] Asked 7 years, 8 months ago Modified 3 years, 4 months ago Viewed 40k times

Map<String, String> myMap = new HashMap<String, String>() {{ put("a", "b"); put("c", "d"); }}; However, the anonymous subclass might introduce unwanted behavior in some cases. This …

Apr 27, 2013 · Convert Hashmap to MapSet to get set of entries in Map with entryset() method.: Set st = map.entrySet(); Get the iterator of this set: Iterator it = st.iterator(); Get Map.Entry from …

300 Lambda Expression Java 8 In Java 1.8 (Java 8) this has become lot easier by using forEach method from Aggregate operations (Stream operations) that looks similar to iterators from …

805 Suppose we have a HashMap<String, Integer> in Java. How do I update (increment) the integer-value of the string-key for each existence of the string I find? One could remove and …

Sep 6, 2009 · If I have the value "foo", and a HashMap<String> ftw for which ftw.containsValue("foo") returns true, how can I get the corresponding key? Do I have to loop …

Is checking for key existence in HashMap always necessary? I have a HashMap with say a 1000 entries and I am looking at improving the efficiency. If the HashMap is being accessed very …