Check if 'Key' exists in a hashmap
104353
HashMap Search for part of an key?
25288
How to make HashMap work with Arrays as key?
124040
Testing if a hash has any of a number of keys
150261
Alternative to File.exists() in Java
21050
Test for existence of nested JavaScript object key
110506
Java: how to convert HashMap to array
76350
Android:Passing a hash map between Activities
38118
Intersection of java.util.Map
40229
How do I check if a variable exists?
38263
How can I combine two HashMap objects containing the same types?
1959
How do I efficiently iterate over each entry in a Java Map?
93555
HashMap with multiple values under the same key
134025
How to check if an array value exists?
14745
Java: Detect duplicates in ArrayList?
51586
Using two (or more) objects as a HashMap key
56252
Map implementation with duplicate keys
84676
How do I check that multiple keys are in a dict in a single pass?