Complete Java SE 8 Developer Bootcamp - Immutable Strings

The video tutorial explains the concept of string immutability in Java, highlighting that once a string is created, it cannot be changed. It discusses the implications of string concatenation on memory and performance, emphasizing the role of garbage collection. The tutorial compares StringBuilder and StringBuffer, noting that StringBuffer is thread-safe but slower. Practical examples are provided to illustrate these concepts, along with tips for exams.

Why are strings in Java considered immutable?

• Because they can be changed after creation

• To prevent issues when multiple references point to the same string

• Because they are stored in a special memory area

• To allow for faster performance

What happens when you call a method like toUpperCase on a string?

• The original string is modified

• The method does nothing

• The string is deleted

• A new string is created with the changes

What is a potential problem with having many unreferenced string objects?

• They take up disk space

• They can slow down the garbage collector

• They improve performance

• They cause syntax errors

Why might a developer choose StringBuilder over StringBuffer?

• StringBuilder is faster when thread safety is not a concern

• StringBuffer is easier to use

• StringBuilder is thread-safe

• StringBuffer is faster

What is the main difference between StringBuilder and StringBuffer?

• StringBuilder is thread-safe

• StringBuffer is immutable

• StringBuilder is immutable

• StringBuffer is thread-safe

When should you use StringBuilder instead of StringBuffer?

• When you are not concerned about thread safety

• When you are working with file I/O

• When you want to create immutable strings

• When you need thread safety

What should you ensure when calling a method on a string?

• That the string is null

• That the method is called twice

• That the return value is captured

• That the original string is modified