Stage2.java

package search;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

/**
 * A program that reads text lines from the standard input
 *          and processes single-word queries.
 *  The program outputs all lines that contain the string
 *          from the query.
 *  For this stage, this includes the case
 *      where the query string appears as a substring of one of the text lines.
 *  For example, the query "bc" should be found in a line containing "abcd".
 */
public class Stage2 {
    private static List<String> getWordsThatMatch(
            final String toSearch, final ArrayList<String> listOfPerson) {
        List<String> matchingLines = new ArrayList<>();
        for (String person : listOfPerson) {
            if (person.toLowerCase().contains(toSearch)) {
                matchingLines.add(person);
            }
        }
        return matchingLines;
    }
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter the number of people:");
        int noOfPerson = Integer.parseInt(scanner.nextLine());
        ArrayList<String> listOfPerson = new ArrayList<>();
        System.out.println("Enter all people:");
        while (noOfPerson-- > 0) {
            listOfPerson.add(scanner.nextLine());
        }
        System.out.println("Enter the number of search queries:");
        int queries = Integer.parseInt(scanner.nextLine());
        while (queries-- > 0) {
            System.out.println("Enter data to search people:");
            String wordToSearch = scanner.nextLine();
            List<String> find =
                    getWordsThatMatch(wordToSearch.toLowerCase(), listOfPerson);
            if (find.isEmpty()) {
                System.out.println("No matching people found.");
            }
            else {
                System.out.println("Found people:");
                find.forEach(System.out::println);
            }
        }
    }
}