Closed. This question needs details or clarity. It is not currently accepting answers.
Want to improve this question? Add details and clarify the problem by editing this post.
Closed 9 years ago.
Improve this question
I have a table with an "identifier" attribute.
I need this attribute to be unique and auto-incremented by one (length of the attribute must be six digits).
For example the first time I persist an entity, the identifier should be 000001 and the second one 000002 and so on.
Could you please tell me how to implement this requirement?
Thanks in advance.
You will have to convert your number as a String.
To do so, you can use String.format.
String.format("%06d", num)
'0' The gaps are filled with 0.
'6' The result has a size of 6.
'd' The result is formatted as a decimal integer.
For example:
int num = 8;
String var = String.format("%06d", num);
will return:
var = "000008"
EDIT: The syntax of String.format can be found here: http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html#syntax
If you want to retrieve an ID from your base, just parse the String as a Number:
String identifier = "000008"; // Returned ID from database
Number num = Integer.parseInt(identifier); // num = 8
Related
Closed. This question needs to be more focused. It is not currently accepting answers.
Want to improve this question? Update the question so it focuses on one problem only by editing this post.
Closed 23 hours ago.
Improve this question
I have 2 different range expressions as follows:
1 - 10 cm
5+ m
and I'd like to extract min, max and unit from these expressions using Regex (where I am a newbie at), like:
Integer min = 1
Integer max = 10
String unit = "cm"
and
Integer min = 5
Integer max = null
String unit = "m"
respectively. Is it possible to do it using one pattern, if so how?
Thanks in advance...
Closed. This question needs to be more focused. It is not currently accepting answers.
Want to improve this question? Update the question so it focuses on one problem only by editing this post.
Closed 2 years ago.
Improve this question
I am trying to learn java but I am lost with the challenge below
what it does:
0. prompt user for a String
1. read a String from the user
2. print the character in the string with the lowest Unicode
3. continue until the user enters the string 0
Example:
enter a string (end with 0): ksjdhfasksjsh
first: a
enter a string (end with 0): ksdjdhfgKKFHDFGASDJSDHsjsdhjasjhdsj
first: A
You need to:
Set a char variable min to Integer.MAX_VALUE;
iterate thru the String and get each character
Compare to min. If less than min assign char to min
when done the min value will be the lowest value character
so print it.
Closed. This question needs to be more focused. It is not currently accepting answers.
Want to improve this question? Update the question so it focuses on one problem only by editing this post.
Closed 3 years ago.
Improve this question
From the following value
[AAMP-PLAYER]aamp pos: [14..187..202..2196879032]
I want to get the last number 2196879032
Some times value will be -1
[AAMP-PLAYER]aamp pos: [14..187..202..-1]
Instead of split method how can i extract last digit using regex method
You could match the last (possibly negative) number at the end of the string, just before the closing ]:
(\-?\d+)\]$
A number is last if it is not followed (following it anywhere, not just immediately) by any other number.
(\-?\d+)(?!.*\d)
We could try using a String#replaceAll option here:
String input = "[AAMP-PLAYER]aamp pos: [14..187..202..2196879032]";
String num = input.replaceAll("^.*\\.\\.(-?\\d+).*$", "$1");
System.out.println(num);
This prints:
2196879032
Closed. This question needs to be more focused. It is not currently accepting answers.
Want to improve this question? Update the question so it focuses on one problem only by editing this post.
Closed 6 years ago.
Improve this question
So lets say I want to randomly choose from the set of two numbers 1 and 3.
How do I go about doing that? Do I just assign int a to 1, int b to 3, and then do randomly select from a and b?
If there are only two numbers to choose from then you can use the value of a boolean, because it returns either true or false.
One-liner solution assuming that int a = 1 and int b = 3:
int randomOfTwoInts = new Random().nextBoolean() ? a : b;
If you have a specific list of numbers then put them in list structure (an array works well). Then you have the easier task of looking for a random index in the range from 0 to last array index. This post lists strategies for doing that:How do I generate random integers within a specific range in Java?
Closed. This question needs to be more focused. It is not currently accepting answers.
Want to improve this question? Update the question so it focuses on one problem only by editing this post.
Closed 8 years ago.
Improve this question
I need to write a function (logic) so that for a set say A{1,2,3,4,5} i generate a unique value .
and when i pass back the same value back to the function it should return me the set of values present in the set .
For example the unique value generated is say '5' then when i pass 5 as input to the function it should give me all the values of set A i.e 1,2,3,4,5.
So i need to know if it can be achieved using any statistical approach like mean median mode etc something like that .
Something like this?
$valSet = array(1, 2, 3, 4, 5);
$authNum = 5;
if($authNum == $someInputByUser)
{
print $varSet;
}
Is this what you mean?