Why does HashMap#containsKey take an parameter of type Object?
41444
What are the reasons why Map.get(Object key) is not (fully) generic
120808
Why AbstractCollection does not implement equals()?
90129
How to check if an NSDictionary or NSMutableDictionary contains a key?
83351
When to use Properties and when Map in Java?
146230
Apex Map using "Name" as key
25288
How to make HashMap work with Arrays as key?
109876
In the msdn guidance on Equals override, why the cast to object in the null check?
89342
How to putAll on Java hashMap contents of one to another, but not replace existing keys and values?
76350
Android:Passing a hash map between Activities
29042
Can you supply arguments to the map(&:method) syntax in Ruby?
26930
Avoiding key construction for std::map::find()
51586
Using two (or more) objects as a HashMap key
107427
Why aren't Collections.checkedMap and friends used more commonly?
15548
Is a Java hashmap search really O(1)?
99777
Bug in List.contains for Id data type?
91987
Difference between a HashMap and a dictionary ADT
114119
Passing in dynamic key:value pairs to an object literal?