Java Interview Question #6: When to use comparator and comparable in java
Use Comparable:
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If the object is in your control.
If the comparing behaviour is the main comparing behaviour.
When logic is clear natural way to sort the class .No change in future.
Use Comparator:
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If the object is outside your control and you cannot make them implement Comparable.
When you want comparing behaviour different from the default (which is specified by Comparable) behaviour.
When sorting only makes sense for a specific use case
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