Testing A/B: Splits Integer Groups into two [closed] - java

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Is there an algorithm or hash to splits groups into 2, for A/B Testing?
We have customerIds, 1-5000. originally thinking of using Even/Odd, Mod %2. Are there any other algorithms available? Just curious, currently using Java Spring Boot.

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if we use one-to-many-to-many relation how do we know how much subadmin are there? [closed]

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if we use one-to-many-to-many relation how do we know how much subadmin are there?

How to an Array List from least to greatest? [closed]

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I want to make an arraylist that has random numbers and make it in order from least to greatest.
How do I do this?
Try using the
Collections.sort(your_array_name)
This sorts your array from least to greatest in place.
If you still want some more information, try this link:
https://www.geeksforgeeks.org/collections-sort-java-examples/

How to do grouping in java [closed]

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I want to do below data groupBy based on customerProduct using java
[{customerID=123,customerName=John,customerProduct=mobile},
{customerID=456,customerName=roach,customerProduct=laptop},
{customerID=678,customerName=david,customerProduct=mobile},
{customerID=678,customerName=abd,customerProduct=charger}]
How can we do it in java 8
and expecting like below
{
mobile= [
{customerID=123,customerName=John,customerProduct=mobile},
{customerID=678,customerName=david,customerProduct=mobile},
],
laptop= [{customerID=456,customerName=roach,customerProduct=laptop}],
charger= [{customerID=678,customerName=abd,customerProduct=charger}]
}
This should do it.
stream().collect(Collectors.groupingBy(Customer::getCustomerProduct))

android regex for plates [closed]

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I want to generate a regex in android to check plate numbers like
3 letters 1 space and 4 decimal numbers
LLL NNNN
That will be [a-zA-Z]{3}\\s[\\d]{4} as Java string

Airthematic operations of Big real Numbers, 30 to 40 digits long [closed]

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Airthematic operation on Big numbers up to 30 to 40 digits long, some of the related material on internet is not really related. any idea how can we do this.
It's right under your nose, in the standard Java API.
You should use BigInteger or BigDecimal for this purpose.

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