String equality

Question 1

What issue arises when using == to compare string values in Java?
a) It compares the actual string values
b) It compares the memory references of the strings
c) It automatically checks string length first
d) It ignores case sensitivity

Answer 1

b) It compares the memory references of the strings

Question 2

Which method should be used to compare string values for equality in Java?
a) compareTo()
b) equalsIgnoreCase()
c) equals()
d) substring()

Answer 2

c) equals()

Question 3

What is the purpose of the endsWith() method in Java?
a) To check if a string starts with a specific prefix
b) To determine if a string contains a specific sequence of characters
c) To verify if a string ends with a specific suffix
d) To change the case of a string

Answer 3

c) To verify if a string ends with a specific suffix

Question 4

In the isBusinessEmail method, which domain ending will cause an email to be considered invalid?
a) @largecorp.com
b) @gmail.com
c) @business.com
d) @company.com

Answer 4

b) @gmail.com

Question 5

What does the startsWith() method do?
a) It checks if a string ends with a specific suffix
b) It verifies if a string starts with a specific prefix
c) It checks if a string contains a specific substring
d) It removes leading spaces from the string

Answer 5

b) It verifies if a string starts with a specific prefix

Question 6

Which of the following would cause isBusinessEmail() to return true?
a) An email ending with .edu
b) An email ending with @gmail.com
c) An email ending with @largecorp.com
d) An email ending with @personal.com

Answer 6

c) An email ending with @largecorp.com

Question 7

What does the contains() method do in Java?
a) It checks if a string starts with a specific prefix
b) It verifies if a string contains a specific sequence of characters
c) It changes the case of the string
d) It removes certain characters from the string

Answer 7

b) It verifies if a string contains a specific sequence of characters

Question 8

How does the substring() method work when called with two arguments?
a) It extracts a part of the string from the beginning to the end
b) It extracts a substring between two specified indices
c) It replaces part of the string with another
d) It trims leading and trailing spaces

Answer 8

b) It extracts a substring between two specified indices

Question 9

What will the output be when firstName.equals("Victoria") is called and firstName is equal to Victoria?
a) Your name is Victoria!
b) Sorry, your name is NOT Victoria.
c) An error message
d) First name not found

Answer 9

a) Your name is Victoria!

Question 10

What is the expected output when phoneNumber2.contains("-188-") is true?
a) No output is generated
b) The phone number contains 188!
c) This is a valid 188 number!
d) Error in phone number check

Answer 10

c) This is a valid 188 number!