Here is a csv file separated by semicolon and without column headers. The 2nd column is date.
10;06.07.2022;This is test;
08;01.07.2020;This is test;
15;06.07.2021;This is test;
09;06.07.2021;This is test;
Task: Perform conditional filtering on this file according to the date and write result to a new file in the same format. When the condition is specified as “date is 06.07.2022 or earlier than it”, we have the following result:
10;06.07.2022;This is test;
Here is the SPL code:

>file(\"result.csv\").export(file(\"test.csv\").import(;,\";\").select(#2>=?);\";\")

export()function writes a two-dimensional table to a text file. import() function parses a text file. select() function performs the conditional filtering. Remember to set the SPL date format as MM.dd.yyyy.

Read How to Call a SPL Script in Java to find how to integrate SPL into a Java application.

Source: https://stackoverflow.com/questions/72884533/manipulate-csv-file-using-groovy-and-java