How to do grouping in java [closed] - java

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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))

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

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