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 String objects. 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 additional string objects. The tutorial also mentions various methods available in the String Builder class, which will be explored in future sessions.

What is the main characteristic of a string object in Java?

• It is always stored in a file.

• It can be modified directly.

• It is immutable.

• It is mutable.

How many string objects are created in memory when concatenating 'I', 'like', and 'Java' using regular strings?

• Five

• Seven

• Three

• Two

What is a potential issue when performing a large number of string concatenations in Java?

• It automatically optimizes memory usage.

• It can lead to performance degradation.

• It reduces the number of string objects.

• It increases the speed of the program.

What is the primary advantage of using the StringBuilder class in Java?

• It is slower than regular string operations.

• It creates more string objects.

• It requires more memory.

• It allows for mutable strings.

Which method is used with StringBuilder to concatenate strings?

• join()

• concat()

• merge()

• append()