Right way to implement equals contract
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What issues should be considered when overriding equals and hashCode in Java?
95798
Compare object instances for equality by their attributes
110075
How to show the given equality
103788
checking for equality on dispatch_queue_t
104501
How do I enforce null checking?
148586
How to overload operator==() for a pointer to the class?
78156
String.equals() with multiple conditions (and one action on result)
131933
On the usage of Java equality operator
72701
How to emulate SOQL LIKE matching in Apex?
33398
C# difference between == and Equals()
133055
Why do I need to override the equals and hashCode methods in Java?
133999
Does variables' order matter when doing == and === comparisons?
103050
What do  mean such as implements Comparable?
147409
String.equals versus ==
54719
How to handle equality constraints in this problem?
65377
Trouble over riding and using equals method in java
99302
What is the diffrence between isEqualToString and operator == in Objective C?