Java 11 Programming for Beginners 4.3: Working with Strings, Characters, and Regular Expressions

This video tutorial covers the use of strings and regular expressions in Java. It begins with an overview of popular string methods such as equals, compareTo, startsWith, and indexOf. The tutorial then introduces regular expressions, explaining the Pattern and Matcher classes, and how to use them for searching and matching within strings. A practical example demonstrates the application of these concepts, including optimization techniques using StringBuilder and Matcher methods. The video concludes with a demonstration of converting sentences using these methods.

Which method would you use to check if two strings are equal, ignoring case differences?

• compareToIgnoreCase

• equals

• equalsIgnoreCase

• compareTo

What is the primary purpose of the Pattern class in Java regular expressions?

• To execute the search

• To replace matched patterns

• To define the search rules

• To store the search state

Which Matcher method would you use to find a specific occurrence of a pattern within a string?

• matches

• find

• replace

• search

What does the predefined class \d represent in regular expressions?

• Whitespace

• Digit

• Word

• Non-word

Which of the following is a boundary match in regular expressions?

• Backslash d

• Caret (^) for start of string

• Asterisk (*) for zero or more

• Plus (+) for one or more

In the practical example, which method is used to optimize the conversion of a sentence to Pig Latin?

• StringJoiner

• StringBuilder with exact length

• StringBuffer

• StringTokenizer

What is the purpose of the appendReplacement method in the Matcher class?

• To append a string to the end

• To replace the first occurrence

• To find the next match

• To replace the current match and append the result