StringOperations.java

import java.util.Scanner;

public class StringOperations {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        // String concatenation
        System.out.println("Enter the first string for concatenation:");
        String str1 = scanner.nextLine();
        System.out.println("Enter the second string for concatenation:");
        String str2 = scanner.nextLine();
        String concatenatedString = str1.concat(str2);
        System.out.println("Concatenated string:" + concatenatedString);
        // Search a substring
        System.out.println("Enter a string to search:");
        String searchstring = scanner.nextLine();
        if (concatenatedString.contains(searchstring)) {
            System.out.println("Substring ' " + searchstring + " ' found in the concatenated string");
        } else {
            System.out.println("Substring '" + searchstring + "' not found in the concatenated string");
        }
        // Extract substring
        System.out.println("Enter the starting index to extract substring:");
        int startIndex = scanner.nextInt();
        System.out.println("Enter the ending index to extract substring:");
        int endIndex = scanner.nextInt();
        if (startIndex >= 0 && startIndex < endIndex && endIndex <= concatenatedString.length()) {
            String extractedSubstring = concatenatedString.substring(startIndex, endIndex);
            System.out.println("Extracted substring:" + extractedSubstring);
        } else {
            System.out.println("Invalid indices provided. Extraction failed.");
        }
        scanner.close();
    }
}