a guest Dec 13th, 2018 64 Never
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- When you override the equals method, you must adhere to its general contract. Here
- is the contract, copied from the specification for java.lang.Object:
- The equals method implements an equivalence relation:
- • It is reflexive: For any reference value x, x.equals(x) must return true.
- • It is symmetric: For any reference values x and y, x.equals(y) must return true
- if and only if y.equals(x) returns true.
- • It is transitive: For any reference values x, y, and z, if x.equals(y)
- returns true and y.equals(z) returns true, then x.equals(z) must return true.
- • It is consistent: For any reference values x and y, multiple invocations
- of x.equals(y) consistently return true or consistently return false, provided
- no information used in equals comparisons on the object is modified.
- • For any non-null reference value x, x.equals(null) must return false.
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