//list of car license plates, numbers are always of a standard type // need to output each number separately to the console // then create a map of the number - its digits (example A123BC:123) where the key is A123BC and the value is 123 //var autoNumbers = List.of(List.of("A123BC", "B421FT"), List.of("O543EC", "B421FT", "I2220A"));

To solve the task in Java, you can iterate over nested lists, print each number to the console, and then create a Map where the key is the car number, and the value is only the digits from the number.

Example code:

import java.util.*;
import java.util.stream.*;

public class AutoNumbers {
    public static void main(String[] args) {
        List<List<String>> autoNumbers = List.of(
            List.of("A123BC", "B421FT"),
            List.of("O543EC", "B421FT", "I2220A")
        );

        Map<String, String> numberMap = new HashMap<>();

        for (List<String> sublist : autoNumbers) {
            for (String number : sublist) {
                System.out.println(number);
                // Extract digits from the number
                String digits = number.replaceAll("\\D", "");
                numberMap.put(number, digits);
            }
        }

        // Example output of the map
        numberMap.forEach((key, value) -> System.out.println(key + ":" + value));
    }
}

Here, replaceAll("\\D", "") removes all non-digit characters, leaving only the digits.