All Questions
11 questions
6
votes
2
answers
3k
views
Convert Set of Set to List of List in Java
List<List<Integer>> lst = new ArrayList<List<>>();
Suppose I have list of list declared above with name as lst and I have a set of set elements variable declared below. How ...
- 1,058
0
votes
1
answer
2k
views
Finding the first unique integer in int[]
Given an integer array, I want to return the first unique element in the array. I used A List .contains() method to check if Integer array contains the element, the method is correct but not efficient(...
- 114
2
votes
2
answers
147
views
Converting a Set<String> to List<Set<String>> with specific conditions using stream()
I have a set let's suppose with 10 unique elements
Set<String> myset =new HashSet<String>();
[a,b,c,d,e,f,g,h,i,j]
I wish to construct a List<Set<String>> such that each ...
- 341
0
votes
1
answer
666
views
Question about set in java, how does Set works to distinct the duplicate elements?
Can anyone please explain to me how Set works in java? Code as following:
List<Integer> list = new ArrayList<>();
list.add(1);
list.add(2);
...
0
votes
2
answers
1k
views
Distinct items List, Set, HashSet, Lambda, Java 8
I have three alternatives in order to obtain Distinct items in a List
return new ArrayList<>(new HashSet<>(someTypeList));
return new HashSet<>(someTypeList).stream().collect(...
user1410223
1
vote
5
answers
956
views
Identify duplicate customer id's in a list of customers
A complete newbie here so I apologize if my question is stupid. I honestly tried before posting.
I have a list of some customers, with their customer Id's as one column and customer name as the other, ...
- 31
-1
votes
1
answer
4k
views
Why does not Java HashSet.equals() check for object equality?
I've come to this phenomenon this morning, the equals method in Set does not check for value equality of the element while List does. This is not in accordance with the java doc.
Set<MyClass> ...
- 484
2
votes
1
answer
929
views
Java List get last duplicate Object
I have a list of Objects which is filled dynamically and I want to keep only the last duplicated Object. I tried the HashSet to remove duplicates but it's not doing big thing in my case.Can anyone ...
- 465
0
votes
1
answer
144
views
Trying to use a set list
I'm trying to use a Set List in my program for the first time and from everything I've done and researched I seem to be doing this right, but Eclipse is telling me that I can't use List. I do not ...
- 33
12
votes
6
answers
5k
views
List throws ConcurrentModificationException but set does not throws ConcurrentModificationException? [duplicate]
I have below two java class
import java.util.*;
public class ArrayListTest032 {
public static void main(String[] ar) {
List<String> list = new ArrayList<String>();
...
- 7,008
1
vote
7
answers
13k
views
Getting unique elements of List
all I have list containing Duplicate values I want somehow to get only Unique values from it and store it another list or set.So that I can perform some operation on it.
My code:
{
List<...
