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Java Collection Q&A » collection » data 

1. How to get data from Set in one go    stackoverflow.com

I want to get all values of a set interface in one go as a comma separated string. For Example(Java Language):

Set<String> fruits=  new HashSet<String>();

fruits.add("Apple");
fruits.add("Banana");
fruits.add("Orange");
If I print the set as fruits.toString then ...

2. java: copy-on-write data structure?    stackoverflow.com

Is there anything in Java that implements something like the following

interface MSet<T> extends Iterable<T> {
    /**
     * return a new set which consists of ...

3. A data structure for many-to-many symmetric relationship (person friends problem)    stackoverflow.com

I'm kinda of a newbie. I have a question regarding which Java collection (no Hibernate, databases, etc.) is best to use to implement many-to-many symmetric relationship. HashMap with values V=sets of ...

4. java collections data structure    stackoverflow.com

I need a data structure that does contains(element) quickly(preferably O(1)). also it allow me to iterate it in the order it comes in. HashSet satisfy the former, Vector satisfies the ...

5. What is the choice of best data structure for this situation..?    stackoverflow.com

Once have a look at the part of my GUI alt text Once a user selects a particular branch from the branch JComboBox, i have to query the database ...

6. How to check the java data type of an element in a custom collection?    stackoverflow.com

Object ele=a.get(i);
if(ele instanceof java.lang.Integer){//cast to integer:
    print("found Int");
}else{ //cast to string:
    print("found: "+ele.getClass());
}
//prints: found: class com.cycling74.max.Atom$IntAtom
This is part of a larger chunk of code but ...

7. Suggest a Java Collection for this type of data    stackoverflow.com

Possible Duplicate:
(C#) DataTable equivalent in JAVA
Hi I want dataTable like in .Net structure to store my data(in memory obviously). what collection is suitable for this ...

8. Check for unique line data from file with 5 millions lines in Java    stackoverflow.com

I have big file with row like ID|VALUE in one pass. In case of ID repeat, line must be ignored. How to effectively make this checking?
added: ID is long(8 bytes). I need a solution ...

9. java data structure that retains order, does not allow duplicates, and allows removal and insertion other than by object    stackoverflow.com

Is there a java data structure that:

  • does not allow duplicates
  • retains insertion order
  • allows removal and insertion at either the start or end of the collection
There is LinkedHashSet, but it only allows remove(object), ...

10. What data structure can I use for sorting/comparing objects by multiple criteria?    stackoverflow.com

We have a collection of objects, each object has an integer ID and a timestamp. We want to be able to search for duplicates and update the collection based on ...

11. I have to do a data collection project    stackoverflow.com

I have to collect data from social media sites. The source that I have selected is Huffington post. I have to collect data from that site related to a particular topic, ...

12. How to Convert one type of Collection object data's to Another Collection Object    coderanch.com

Hi Friends, 1.we know that LinkedList is faster than ARRAYLIST on insertion and deletion,For iterating to get data inside object arraylist is faster. Is it possible to use Linked list for insertion after how to convert that object to arraylist for iterating and then to Linked list for deletion? please send me some sample code.... 2. How to convert a array ...

14. File uploading and data collection problem    coderanch.com

Hi.. Go for the search option on this site. Search for "multipart form data" this would surely help you, as it has been discussed quite a lot of time. In brief I would say that, multipart request is not treated is the same was as a normal request. Assuming that your stream contains a String, boolean, char and a byte, in ...

15. How to Convert one type of Collection object data's to Another Collection Object    coderanch.com

Hi Friends, 1.we know that LinkedList is faster than ARRAYLIST on insertion and deletion,For iterating to get data inside object arraylist is faster. Is it possible to use Linked list for insertion after how to convert that object to arraylist for iterating and then to Linked list for deletion? please send me some sample code.... 2. How to convert a array ...

16. Is there any collection to store the premitive data type?    coderanch.com

In general, the solution is to use the Wrapper classes. Don't forget, though, that you can easily "extend" the existing collections and add a couple of methods specific to your types. Consider the following off-the-top-of-my-head, uncomiled code: public class IntMap extends HashMap { public void put(Object key, int value) { put(key, new Integer(value)); } public int getInt(Object key) { int ret ...

17. Collections = Data Structures?    coderanch.com

20. Best Collection datastructure to use for very large data    coderanch.com

Hello Ranchers I have an application which handles millions of records. I have a requirment to handle a very large data set in java. Which is that most suitable datastructure which I can use to handle this large data effeciently. I may or may not have data in sorted order. But I can understand somehow whether data I received is sorted ...

22. adding items to a collection using different data structures help    forums.oracle.com

i have been going through this book teaching myself java and i have written several classes that add data items to a collection using: array queue, array stack, linked queue, linked stack, linked node, and prioritized linked node. what i am trying to do is create a GUI that will allow the user to choose between different data structures and then ...

23. Problem parsing data and create new collection    forums.oracle.com

Ok, so with the following line: A,B | C,D,E | F,G,H,I then you'd have 2*3*4 = 24 walks. You could generate a 2D int array of 24*3 which would look like this: 24*3 matrix walk 0 0 0 A,C,F 0 0 1 A,C,G 0 0 2 A,C,H 0 0 3 A,C,I 0 1 0 A,D,F 0 1 1 0 ...

24. Selective collection of data into an array    forums.oracle.com

So I'd need to create some sort of system that waits for the carriage return to signify the end of a string and the start of a new one, buffer the new one, then find the values, and then add them to their respective lists. Any ideas on how i could do this?

25. Large Volume of data with collection    forums.oracle.com

HI , Here i have one problem with handling large volume data with List. I am getting OutOfMemoryException(heap size) exception if the number of items in it is greater than 2 lakh. Is it is like this? or any other alternative is there for handling such situation?..How can i decide which collection class should i use in such scenarios ?.. Thanks ...

26. finding the product of a collection of data values    forums.oracle.com

hello everyone out there can someone help write this program, i have write a program that will find the product of a collection of data values, it should ignore all the negative numbers and terminate at zero if some one could help me that would be great. i kinda have an idea but im not sure, do i need to store ...

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