Java Programming:

There is a list of customers ID and their products as below:

Customer ID	Product
1000	p1
1000	p2
1020	p2
1000	p3
1050	p4

.

There is no order in the list.

Prepare a program that read the data of the list and print the customerID and all his products.

Hint: A HashMap from an Integer (Customer ID) to an ArrayList (type String) should be used.

For the stopping insert data the customerId should be -1.

The result should be:

Customer: 1000 p1 p2 p3 Customer: 1050 p4 Customer: 1020 p2