Core Java Programming Course- StringBuilder Class

The video tutorial explains the concept of the String Builder class in Java, highlighting its ability to create mutable strings, unlike the immutable nature of standard Java strings. Through an example, it demonstrates how string concatenation can lead to multiple string objects being created in memory, which can affect performance. The String Builder class is introduced as a solution to this problem, allowing efficient concatenation without creating unnecessary string objects. The tutorial concludes with a brief mention of advanced methods available in the String Builder class.

What happens when you concatenate strings in Java?

• The original string is modified.

• A new string object is created.

• The string becomes mutable.

• The string is stored in a temporary buffer.

Why is creating multiple string objects during concatenation inefficient?

• It causes syntax errors.

• It increases the complexity of the code.

• It leads to higher memory usage.

• It makes the strings mutable.

How does the StringBuilder class improve performance?

• By allowing direct modification of string objects.

• By using a different syntax for concatenation.

• By reducing the number of string objects created.

• By making strings immutable.

Which method is used in StringBuilder for concatenation?

• concat()

• join()

• merge()

• append()

Which of the following methods is unique to the StringBuilder class?

• charAt()

• substring()

• indexOf()

• delete()