please help me with the answers

Question number 2: According to the concept of regular expression, regular expressions in java are used to validate:

Java Programming Syntax Text strings GUI controls CRUD sentences to the database

Question number 40:

A regular expression in java can be used to: (There are several answers)

Validate that the alphanumeric characters that a client enters into the application belong to a defined pattern. Validate that a person's e-mail address is spelled correctly. Validate the landline and cell phone number entered by the customer through a GUI interface Validate a person's ID number in length and input only numbers Question number 39:

Based on the following section of code written in Java. which package or library should be imported and placed on line 2 for your compilation to be correct?

1. package javaapplication2;

2. import _______________

3. public class JavaApplication2 {

4. public static void main(String[] args) {

5. HashSet Data = new HashSet ();

6. Data.add("Value1");

7. Data.add("Value2");

8. Data.add("Value3");

9. Data.add("Value4");

10. Data.add("Value5");

11. for (Object Value : Data)

12. {

13. System.out.println(Value);

14. }

15. }

16. } Question number 38:

For the following statement to work correctly in java, where Passenger is a class, which package should be imported?

ArrayList< Passenger > lstPassenger = new ArrayList<>();

java.util java.Array java.util.ArrayList java.ArrayList Question number 37:

Which of the following alternatives is correct to place in the blank. The method __________ with an argument, attaches an item to the end of an ArrayList object.

remove contains size add

Question number 36:

When working with generics, the method __________ with a reference to an object as an argument, removes the first element that matches the value of the argument.

contains size remove add

Question number 35:

When working with regular expressions, which class allows you to define the pattern to validate a regular expression?

Pattern Matcher Find Validate