Strings -Java Programming MCQ Questions and Answers

A. It always requires using the + operator.

B. It's a costly operation in terms of performance.

C. It can only concatenate strings with numbers.

D. It doesn't change the original strings.

A. str.findLast(substring)

B. str.lastIndexOf(substring)

C. str.lastIndexOfChar(substring)

D. str.indexOf(substring)

A. To check if the string ends with a specified substring

B. To add a suffix to the string

C. To remove trailing whitespace

D. To check if the string contains a specified character

A. To convert the string to uppercase.

B. To convert the string to lowercase.

C. To check if the string is empty.

D. To reverse the string.

A. extractSubstring()

B. getSubstring()

C. substring()

D. extract()

A. To check if the string is empty.

B. To remove leading and trailing whitespace.

C. To concatenate two strings.

D. To reverse the string.

A. "Hello"

B. "HELLO"

C. "hello"

D. "hElLo"

A. str.contains(char)

B. str.indexOf(char)

C. str.hasChar(char)

D. str.charExists(char)

A. To add a substring to the string

B. To extract a substring from the string

C. To check if the string contains a substring

D. To concatenate two substrings

A. str.getFirstIndexOf(char)

B. str.findFirst(char)

C. str.indexFirst(char)

D. str.indexOf(char)