String Class and their Methods

The video tutorial provides an overview of various string methods in Java, including character and index operations, substring extraction, concatenation, trimming, case conversion, splitting, and replacing. It explains how to use these methods to manipulate strings effectively in programming tasks, with examples and practical applications.

What is the index of the first character in a string?

• 3

• 0

• 1

• 2

Which method is used to find the index of a character in a string?

• indexOf

• concat

• substring

• charAt

What will be the output of 'hello'.substring(1, 3)?

• llo

• he

• ell

• el

How do you concatenate two strings in Java?

• Using join method

• Using + operator

• Using append method

• Using concat method

What does the trim method do to a string?

• Converts to uppercase

• Removes leading and trailing spaces

• Removes all characters

• Splits the string

Which method converts all characters in a string to uppercase?

• toLowerCase

• toTitleCase

• capitalize

• toUpperCase

What is the result of splitting 'Java/Training' by '/'?

• ['Java', 'Training']

• ['JavaTraining']

• ['Java/', 'Training']

• ['Java', '/Training']

How can you replace all occurrences of 'a' with 'o' in a string?

• replaceChar('a', 'o')

• replaceFirst('a', 'o')

• replaceAll('a', 'o')

• replace('a', 'o')

What is the return type of the split method?

• Array of Strings

• String

• Set of Strings

• List of Strings

Which method would you use to find the length of a string?

• size()

• measure()

• length()

• count()