What is the  thing in a hashmap, and how do I use it in my own class?
103050
What do  mean such as implements Comparable?
123167
What is the use of hashCode in Java?
36705
How to read the value of a private field from a different class in Java?
53557
Java: A "prime" number or a "power of two" as HashMap size?
46988
Using "this" with methods (in Java)
16461
How to initialize an array in Java?
142913
How do you get the "object reference" of an object in java when toString() and hashCode() have been overridden?
11025
What is wrong with this C++ map?
74320
Java Hashmap: How to get key from value?
67299
"Instantiating" a List in Java?
49
What is a NullPointerException, and how do I fix it?
108487
What basic operations on a Map are permitted while iterating over it?
28896
JavaScript hashmap equivalent
24452
How to use Map inside MapThread?
38708
What is a use case where one would use an SObject as a Map key?
108024
What are the differences between a HashMap and a Hashtable in Java?
110886
How to use Class in Java?