we have 2 classes: public class Customer { private String id; private String name; private String town; // getter and setter, tostring and other methods are omitted } public class Order { private Customer customer; private Integer year; private Integer amount; // getter and setter, tostring and other methods are omitted }   -Create a Map collection that has Customer as keys and list of orders as values and populate it by the data in the input files.Also,find all the Orders that occurred in a given year and sort them by order amount (from low to high),and find all Customers from a given town and sort by name.   the file "Customers.txt": 11122:jon:uk 15621:Rony:uk 16755:Roy:uk the file "Orders.txt": 13452:2014:230 23125:2015:550 32212:2021:1230   in java Using streams and lambda

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User Defined DataType

The data type is a format to store data that contains a particular range or type of value. It specifies which type of value a variable should have. In other words, a data type describes the type of data that variables can store. When a program stores data in the variables, then every variable needs to be assigned value that falls within the range of its data type. The following are some of the data types: