[Solved] What can I use instead of Set() in Java?

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You can use below code which uses HashSet() in Java. 

public static boolean hasPairWithSum2(int arr[], int sum){
    HashSet<Integer>mySet=new HashSet<Integer>();
    int len = arr.length;

    for (int i = 0; i < len; i++){
        if (mySet.contains(arr[i]))
            return true;

        mySet.add(sum - arr[i]);
    }

    return false;
}

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solved What can I use instead of Set() in Java?