Why won't my HashSet allow me to add two of the same instance, if their equals() says they're false?
76854
When does HashSet 'add' method calls equals?
104515
Initializing Hashtables in Java?
3526
How to determine equality for two JavaScript objects?
54719
How to handle equality constraints in this problem?
93555
HashMap with multiple values under the same key
130290
Ordering of elements in Java HashSet
141442
Why does my string comparison fail?
156145
Should we always override equals?
110074
What is the difference between == and equals() in Java?
3941
What's the difference between ".equals" and "=="?
72298
HashSet contains duplicate entries
89414
Possible to add more than one object via Boolean modifiers?
54156
Elegant ways to support equivalence ("equality") in Python classes
5143
Any simple way to explain why I cannot do List animals = new ArrayList()?
70078
Java two equal signs in one statement?
150825
Is an empty set equal to another empty set?
101173
Testing string equality using hashCode()