Greater than 10? You're not a good fit for us

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The Oddiozo transshipment center is looking for employees. The only requirement is this: employees must not have more than ten limbs (we don't know where this form of discrimination came from). We'll help them with a program that will create a set of numbers (Set ), add 20 different numbers, and then remove from the set all the numbers greater than 10.
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Liliane TopLevel 17 , Amsterdam
16 February, 18:45
I'm very confused about the usage of HashSet vs Set. In the given examples I encounter Set<String> set = new HashSet<String>(); but in the task above it gives an error with the return statement. When I changed this into: HashSet<String> set = new HashSet<String>(); it worked. I'm so confused. What is the difference? And why give examples if they do not work? Can anybody shed some light on this matter? Very much appreciated!
TurnerLevel 11 , Pittsburgh
30 August 2019, 05:38
Can I assume that a solution for removeAllNumbersGreaterThan10() - first, iterate through the set and set all numbers > 10 to a separate array then iterate through the array removing the set elements WITH NO CONCURRENCY issues fails the requirement is because of Time complexity? Not sure if Iteration<Integer> introduces a savings of Space complexity, but an extra for loop does NOT increase performance much beyond O(n). Can you explain what I am missing in why this solution is not allowed to pass? Please advise.
maniLevel 13 , Harpanahalli
28 June 2019, 12:41
can you please help to find my errors
DinoLevel 13 , Zagreb
10 January 2019, 20:58
Can anyone tell me what doesn't work here? Thanks! package com.codegym.task.task08.task0814; import java.util.HashSet; import java.util.Set; import java.util.Iterator; /* Greater than 10? You're not a good fit for us */ public class Solution { public static HashSet<Integer> createSet() { // write your code here int[] a = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}; HashSet<Integer> set = new HashSet<Integer>(); for(int aa: a) set.add(aa); return set; } public static HashSet<Integer> removeAllNumbersGreaterThan10(HashSet<Integer> set) { // write your code here for(Iterator<Integer> iterator = set.iterator(); iterator.hasNext();) { Integer aa =; if (aa > 10) set.remove(aa); } return set; } public static void main(String[] args) { } }
Guadalupe GagnonLevel 37 , Tampa
10 January 2019, 21:13
hit the help button at the top and ask your question. Do not copy/paste your code...... use the slider:
Ed MaphisLevel 20 , Painesville
23 May 2019, 19:26
Hmmm, I didn't know that.
Abhishek RangariLevel 22 , Nagpur
28 October 2018, 18:19
Be sure that the removeAllNumbersGreaterThan10 method works with sets of any size. ? public static HashSet<Integer> removeAllNumbersGreaterThan10(HashSet<Integer> set) { // write your code here for(Integer num : set){ if(num > 10){ set.remove(num); } } return set; } Does any one is having idea about this ? Can you help me to resolve this issue.
RomanLevel 41
29 October 2018, 06:35
You must use an iterator to remove items.
Deepak JoshiLevel 17 , Nainital
1 May 2019, 15:25
use Irerator to remove items otherwise it will raise ConcurrentModificationException