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Java Collection Q&A » List » order 

1. Helper in order to remove null reference in Java List?    stackoverflow.com

Suppose the following List

List<String> list = new ArrayList<String>();

list.add("s1");
list.add("s2");
list.add(null);
list.add("s3");
list.add(null);
list.add("s4");
I need a Helper class that removes null references. Something like SomeHelper.removeNullReference(list); Now, list only contains "s1", "s2", "s4", "s4". Non-null references. What should i use in ...

2. Java code to convert a list of dependencies into a build order?    stackoverflow.com

Given I have a list of dependencies available as bits in external files. These will be aggregated into a list like:

module1
module2 dependsOn module1
module3 dependsOn module1
module4 dependsOn module3
I would like to create ...

3. is there a List implementation (in Java) that supports insertion with shifting?    stackoverflow.com

Suppose I have a List with the elements 4,7,9,17,24 and I want to insert 11 but to keep them ordered. So I'd like to do something like list.add(3, 11), and to get the following list: 4,7,9,11,17,24 but ...

4. how to merge two ordered list of objects?    stackoverflow.com

public class ListMerge { public static void main( String[] args) {

   Scanner input = new Scanner(System.in);

  System.out.println ("Input length of arraylist 1:");
  int ...

5. lexicographical ordering of string list using guava    stackoverflow.com

what is the simple way to do lexicographical ordering of string list using guava. I do it this way:

List<String> s = newArrayList(
    "susen", "soumen", "dipak", "abhi", "zylo",
   ...

6. Is there a way to create a List/Set which keeps insertion order and does not allow duplicates in Java?    stackoverflow.com

What is the most efficient way of maintaining a list that does not allow duplicates, but maintains insertion order and also allows the retrieval of the last inserted element in Java? ...

7. Merging ordered List    stackoverflow.com

Please allow me to ask this question with an example: Suppose we have the following 3 lists (omitted double quotes for clarity):

L1: (a, c, b, d, f, j)
L2: (b, e, j, k)
L3: ...

8. Java File.list() consistent order?    stackoverflow.com

This is an awful question (in my mind) and I've tried my best to find myself useful documentation with little luck - anyway, here goes: I have code which needs to ...

9. Convert a List to a List, where MyObject contains an int representing the order    stackoverflow.com

Is there a pattern, or built in function I am missing or shall I just loop through like so

public List<MyObject> convert(List<String> myStrings){

    List<MyObject> myObjects = new ArrayList<MyObject>(myStrings.size());

  ...

10. Glazed Lists SortedList update when source object order property changed    stackoverflow.com

I have some object with orderProperty

class Car
{
    private int order;

    // getter and setter implementation
}
Then I create EventList:
EventList<Car> cars=new BasicEventList<Car>()
for (i=0;i<10;i++) {Car car=new Car(i); cars.add(car);}
Then ...

11. Java : list that contains unique elements in order    stackoverflow.com

Is there a list type in java that stores objects in ascending order and not adds if this object is previously added. I know java maps can do that but I ...

12. Get records in certain order from list    coderanch.com

Well, it does have something to do with servlets. Basically, I am creating a paginating system. The user has records and he can go through 50 records at a time. What Im trying to code here is the "previous page link". If the user clicks the previous link it should load the last 50 records. I dont know where to start ...

13. Ordering Lists of Lists (Table) by more than one column    coderanch.com

An arraylist can be sorted by using the method Collections.sort(ArraytoSort) This wil sort the arraylist of strings in their natural order. If you want to sort your own objects in JAVA you have to define your own Comparable interface which can sort over different columns because you have to define your own CompareTo method. If you have different ways of sorting ...

14. Ordered List    coderanch.com

I'm trying to figure out what I should use to implement a shopping cart. I've got a class that implements a product instance, and I want to have add() and remove() and updateQty() methods as part of my cart class. What I'm trying to figure out is what class to use to keep the list of products in the cart. I've ...

15. Ordered List Question    coderanch.com

Hello Everyone, I have to implement an Ordered List using a Linked List, using the following class definitions: class linkedlist { int indexOf(Object o) {} void add(Object o) {} void addFirst(Object o) {} void addLast(Object o) {} void addAtIndex(int index, Object o) {} Object get(int index) {} Iterator getIterator() {} } class orderedlist { Comparator comparator; OrderedList(Comparator c) { this.comparator = ...

16. List in Descending order    coderanch.com

Hi all, This is the code for adding elements to list and display it in sorted manner. It is sorted from A-Z. I want to sort the list from Z-A. How to do it? package ex; import java.util.*; public class SortList { public static void main(String[] args) { ArrayList l = new ArrayList(); /*Adding values to the list*/ l.add("Suma"); l.add("Anu"); l.add("vani"); ...

17. How to maintain order in list    coderanch.com

Hi, I wrote a simple program to check if the list always returns an ordered collection items. For me it does not seems working. I given the below program and output i got, can you tell me if i do something wrong here import java.util.*; public class ListSorted { public static void main(String[] args) { List list = new ArrayList(); list.add("ramesh"); ...

18. Regarding Ordering the List    coderanch.com

Hi Friends, I have one requirement would you please help on this.. public List getEmployeeList() { if (Employee== null) { employee= new ArrayList(); } return this.employee; I have List object which contain three elements...from the preceding code we will get the list object.. My question is how to set the order number to each element in list so based on the ...

19. How to add multple lists in one list in insertion order    coderanch.com

Hi, I want to add the list elements from multiple lists to one parent list. Can some some tell me how it can be done? e.g. public static void main(String[] args) { List child1List = new ArrayList(); List child2List = new ArrayList(); child1List.add("12"); child1List.add("323"); child1List.add("11"); child2List.add("43"); child2List.add("1"); child2List.add("87"); // First add child1List to parentList and then add child2List to parentList //List ...

20. Ordered list - inserting wherever on the list    java-forums.org

Hi, I'm looking for and ordred list structure. The problem is that the lists I found I only could insert object at the begining or at the and of the list. I want to be able to insert objets at any place of the list because I want it to be ordered. does anybody knows how can I do it? Thanks ...

21. Creating a List of Names in Random Order?    forums.oracle.com

22. Adding to a List in Natural Order.    forums.oracle.com

23. Listing names in ascending order.    forums.oracle.com

The best solution will be to learn how to sort. Trying to do this with if statements is just going to be incredibly messy. For example you can write an if statement to work out which name is first but then how do you work out which name is second and third? You need to "remember" which name is first and ...

24. Most efficient way to make an ordered list?    forums.oracle.com

Also, I think maybe I wouldn't need to do all those repeated distance calculations. Instead of only storing my agent in each node, why can't I store both the agent and the distance in the node? When when I do my comparisons to work out where to put the next agent, I can just look at the distance value for each ...

25. Ordered List X    forums.oracle.com

26. A list of word frequencies ordered by word count and then alphabetically    forums.oracle.com

public String getSentence() throws EOFException { char getNextChar = charReader.GetNextChar(); return Character.toString(getNextChar); } public void getFrequency(String expression) throws EOFException { String sentance = expression; Map map = new TreeMap(); Integer ONE = new Integer(1); // For each word for (int i = 0, n = words.length; i < n; i++) { if (words.length() > 0) { Integer frequency = (Integer) map.get(words); ...

27. Get records in certain order from list    forums.oracle.com

Presumably this happens when the user selects a number that's bigger than the number of entries in the list? Or when the user selects a number that's less than 10? Don't just blindly assume your code is going to work, have it check that it isn't trying to get an entry that's out of range.

28. Ordering a list    forums.oracle.com

Hello i would like to order a list of object by a number set by a property of the object contain in the list. For exemple i have a list containing some person object, each person has a property numOrder, so that if numOrder equal 1 the person will be place first on list. Thanks for helping.

29. add method of ordered list    forums.oracle.com

30. Implement Ordered List using Links    forums.oracle.com

hey guys! i need to write a program that implements an ordered list using links. My first step has always been to find examples and read them over for help. However, i am having a hard time finding this one and i was wondering is anyone had or knows where to find an example of a OrderedLinkList using LinearNodes. It would ...

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