We have two csv files compare these two files and write the difference in 3rd csv file.
Ex: File1 have 10 Employee records like id, Firstname, LastName, email, phone.
In File2 have different email or Phone for the file1 record. We need add that record old value and new value in 3rd Csv file. By using HashMap. key will be the EmployeeID.
Need to write using Java POJO Class and Code has to check File size not more than 1MB or any other size.
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