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Asked: 2026-05-26T15:30:03+00:00

I have a class Attribute which has 2 variables say int a,b ; I

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I have a class Attribute which has 2 variables say int a,b;

I want to use class Attribute in two different HashSet.

The first hash set considers objects as equal when the value of a is same.
But the second hash set considers objects as equal when the value of b is same.

I know if I override the equals method the hashset will use the overriden version of equals to compare two objects but in this case I would need two different implementations of equals()

One way is to create two subclasses of attribute and provide them with different equals method but I want to know if there is a better way to do it such that I dont have to create subclass of Attribute.

Thanks.

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  1. Editorial Team

    I did some thing different, Instead of using the HashSet, I have used HashMap where I have used int a as a key in first HashMap and the object is stored as value.
    And in the other HashMap I have kept the key as int b and the object as value.

    This provides me a way to Hash on both the variables a and b so I dont have to make any sub classes.

    And also, I get O(1) time instead of O(log n). But I know I am paying the price by using some more memory but my main concern was time so I chose HashMap over TreeSet.

    Thank you all for your comments and suggestions.

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