All Questions
56 questions
0
votes
1
answer
61
views
how to efficiently check common elements of two lists of different types ( class A and class B) and make a resultant list of type A for all matches
I have a list of class A with 1000 elements that has all unique ids. There is some other Class B , which also has a unique id parameter and this B is a json property of Class A.
the relation is like :
...
- 5
0
votes
1
answer
64
views
Read nested list with other attributes in Java streams
I have a list of object for example Person in turn have couple of lists with few generic attributes like below
List<Address> address1 = List.of("1","2","5","6&...
- 87
0
votes
0
answers
73
views
How could you generate all permutations of ABC with no repeats for any length?
So if I had a list of
String[] list = {A,B,C};
generateAllCombonations(list);
would return:
ABC
ACB
BAC
BCA
CAB
CBA
for any length of the list?
AAB would not be allowed given no repeats
also, AB would ...
0
votes
4
answers
546
views
Streams use for map computation from list with counter
I have the following for loop which I would like to replace by a simple Java 8 stream statement:
List<String> words = new ArrayList<>("a", "b", "c");
Map<...
- 311
1
vote
0
answers
119
views
After reading list containing objects using ObjectInputStream how to iterate through the list?
I have a binary file having some list where each list has group of similar objects
I am using ObjectInputStream to read the list series one by one
Now, instead of directly printing the list I want to ...
- 1,386
0
votes
0
answers
14
views
displaying values in tabular format [duplicate]
displaying List in tabular format but somewhere I am doing wrong.
a.jsp
List<String> abc =
(ArrayList<String>)request.getAttribute("studentsrollno"); // got
studentsrollno from ...
- 771
0
votes
1
answer
29
views
Comparing nested lists within a parent list structure for values in specific indices in java
Given a list of lists in the following format:
List < List < String, String, BigInteger, String, String, String, String, String, String > > rows
what would be the best way to iterate through ...
- 1
1
vote
1
answer
72
views
Iterating through a list which is an object of a table
public List<AnswerValues> getAllAnswers(Forms fm){
Session sess = getSession();
Criteria crit = sess.createCriteria(FormQuestions.class);
crit.add(Restrictions.eq("fkformId",fm));
...
- 467
1
vote
2
answers
73
views
Java - Retrive Indivudual Values from a List in a Map
I have a TreeMap with 3 entries, all from individual ArrayLists.
I use the following code:
Map<String, List<String>> mapOne = new TreeMap<String, List<String>>();
List<...
- 3,411
0
votes
0
answers
52
views
Iterating over a list of array objects (trying to make code more concise)
I currently have the following code:
if (task5.isVisible()) {
if (!task1.isVisible()) {
task1.setVisible(true);
checkBox1.setVisible(true);
} else if (!task2.isVisible()) {
...
- 37
-1
votes
1
answer
41
views
Excluding an integer from an array to find the 2nd smallest
I have an assignment where my prof. will input an unspecified number of integers into my program, and my program will process the data accordingly to assign a grade to each value and find the highest ...
-3
votes
1
answer
1k
views
Java 8 Streams for List iteration
I have a HashMap that contains List<Dto> and List<List<String>>:
Map<List<Dto>, List<List<String>>> mapData = new HashMap();
and an Arraylist<Dto>.
I ...
0
votes
1
answer
727
views
LinkedList - Get current and previous when traversing
I have a LinkedList, and need to know the current, previous, and next item when iterating thru it. I guess there is no way to do this with the "for each" notation, so I turned to list iterators. They ...
3
votes
2
answers
101
views
How to do a nested iteration over an abstract list efficiently?
I'm trying to replicate the typical construct of "walking the upper diagonal matrix of the self Cartesian product", with a list as a source. In layman terms, if I have an array a I want to do this:
...
- 76.2k
-2
votes
2
answers
725
views
Java: For loop on Objects of Strings
I'm new in Java and I have to solve this exercise. I have this code:
public class StringList {
private String list = "";
public StringList(String... str) {
for (...
- 7