How to prevent HashMap to store duplicate Object type value and returns the existing value reference?
878
What issues should be considered when overriding equals and hashCode in Java?
2691
How to return multiple objects from a Java method?
119728
How to remove all duplicates from an array of objects?
79879
Understanding Object.clone() in Java
133055
Why do I need to override the equals and hashCode methods in Java?
119114
How do I clone a generic List in Java?
64929
Map of with object references as keys?
15548
Is a Java hashmap search really O(1)?
28896
JavaScript hashmap equivalent
132703
Theoretical limit for number of keys (objects) that can be stored in a HashMap?
109841
How does Java Garbage collector handle self-reference?
40587
Why not allow an external interface to provide hashCode/equals for a HashMap?
25288
How to make HashMap work with Arrays as key?
74320
Java Hashmap: How to get key from value?
62369
Iterate through a HashMap
131222
Is there a Java library that can "diff" two Objects?
89487
Is it safe to get values from a java.util.HashMap from multiple threads (no modification)?