Java - Interview Questions and Answers on StringJoiner

Q1.  What is StringJoiner ?

Ans. StringJoiner is a util method to construct a string with desired delimiter. This has been introduced with wef from Java 8.

Sample Code

StringJoiner strJoiner = new StringJoiner(".");
System.out.println(strJoiner); // prints Buggy.Bread

Q2.  Which of the following has been introduced with Java 8 ?

 a. StringBuffer
 b. StringBuilder
 c. StringFilter
 d. StringJoiner

Ans. StringJoiner

Q3. What is the package name for StringJoiner class?

Q4. Which is the Parent Class of StringJoiner class?