Which collection shall I use ?

Hi every one,
I am just stuck with one problem , I want to have elements which can avoid duplicate and also maintain order. I am not able to find the solution...
Thanks in advance..

I am just stuck with one problem , I want to have elements which can avoid duplicate and also maintain order. I am not able to find the solution...Avoid duplicates => you want a set (mathematical concept), represented in the JDK standard API as interface <TT>java.util.Set</TT> (http://download.oracle.com/javase/6/docs/api/java/util/Set.html)
"maintain order" => you probably merely want a <TT>SortedSet</TT> (http://download.oracle.com/javase/6/docs/api/java/util/SortedSet.html)
Then browse the Javadoc to find one of the multiple classes that implement those interfaces.
J.

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Edited by: radiatejava on Feb 27, 2009 11:52 AM

1. Yes, normal queue semantics are followed (ie data always removed from head and added at the end only).
2. Saying that only BlockingQueue is the option is not correct. I can also opt for normal LinkedList and ArrayList with my own sync implementation like this :
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synchronized (Queue_) {
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Queue_.wait();
Queue_.addLast(msgBuffer);
Queue_.notifyAll();
And similar thing can be done on the consumer side.
3. Lastly, pls keep in mind that LinkedList or LinkedBlockingQueue impls wrap the actual objects to be addded into another Node class objects thus creating lots of extra objects that needs to be GCed as well, making the performance not as desired as we expect (extra time is spent on GC).
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Message was edited by: Adie Hughes

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I am just stuck with one problem , I want to have elements which can avoid duplicate and also maintain order. I am not able to find the solution...Avoid duplicates => you want a set (mathematical concept), represented in the JDK standard API as interface <TT>java.util.Set</TT> (http://download.oracle.com/javase/6/docs/api/java/util/Set.html)
"maintain order" => you probably merely want a <TT>SortedSet</TT> (http://download.oracle.com/javase/6/docs/api/java/util/SortedSet.html)
Then browse the Javadoc to find one of the multiple classes that implement those interfaces.
J.

Which system shall I use?

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I am just stuck with one problem , I want to have elements which can avoid duplicate and also maintain order. I am not able to find the solution...Avoid duplicates => you want a set (mathematical concept), represented in the JDK standard API as interface <TT>java.util.Set</TT> (http://download.oracle.com/javase/6/docs/api/java/util/Set.html)
"maintain order" => you probably merely want a <TT>SortedSet</TT> (http://download.oracle.com/javase/6/docs/api/java/util/SortedSet.html)
Then browse the Javadoc to find one of the multiple classes that implement those interfaces.
J.

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i have two text files having 10,0000(aprox)
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plz send me the logic....

> so which collection should i use to perform it..
so that performance is best......
Program to interfaces. That way, you can switch out implementations and test for yourself which performance is best in an actual production context. But first, write your program so that it works. Worry about refactoring for performance once your program is written and it works.
> plz send me the logic....
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~

Report in which collect statement .

report in which collect statement is used and also its purpose.

COLLECT
Basic form
COLLECT [wa INTO] itab.
Addition
... SORTED BY f
Effect
COLLECT is used to create unique or compressed datsets. The key fields are the default key fields of the internal table itab .
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After COLLECT , the system field SY-TABIX contains the index of the - existing or new - table entry with default key fields which match those of the entry to be processed.
Notes
COLLECT can create unique or compressed datasets and should be used precisely for this purpose. If uniqueness or compression are unimportant, or two values with identical default key field values could not possibly occur in your particular task, you should use APPEND instead. However, for a unique or compressed dataset which is also efficient, COLLECT is the statement to use.
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COLLECT will run very efficiently.
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Example
Compressed sales figures for each company
DATA: BEGIN OF COMPANIES OCCURS 10,
NAME(20),
SALES TYPE I,
END OF COMPANIES.
COMPANIES-NAME = 'Duck'. COMPANIES-SALES = 10.
COLLECT COMPANIES.
COMPANIES-NAME = 'Tiger'. COMPANIES-SALES = 20.
COLLECT COMPANIES.
COMPANIES-NAME = 'Duck'. COMPANIES-SALES = 30.
COLLECT COMPANIES.
The table COMPANIES now has the following appearance:
NAME SALES
Duck 40
Tiger 20
Addition
... SORTED BY f
Effect
COLLECT ... SORTED BY f is obsolete and should no longer be used. Use APPEND ... SORTED BY f which has the same meaning.
Note
Performance
The cost of a COLLECT in terms of performance increases with the width of the default key needed in the search for table entries and the number of numeric fields with values which have to be added up, if an entry is found in the internal table to match the default key fields.
If no such entry is found, the cost is reduced to that required to append a new entry to the end of the table.
A COLLECT statement used on a table which is 100 bytes wide and has a key which is 60 bytes wide and seven numeric fields is about approx. 50 msn (standardized microseconds).
Note
Runtime errors
COLLECT_OVERFLOW : Overflow in integer field when calculating totals.
COLLECT_OVERFLOW_TYPE_P : Overflow in type P field when calculating totals.

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Which collection shall I use ?

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