Java Programming for Complete Beginners - Java 16 - Step 05 - Understanding String is Immutable and String Concat, Upper

The video tutorial explains the concept of string immutability, demonstrating how strings in programming cannot be altered once created. It covers string concatenation, showing that operations like concatenation result in new strings rather than modifying the original. The tutorial also introduces various string methods such as converting to uppercase, lowercase, and trimming spaces, emphasizing that these methods return new strings. The video concludes with a brief overview of upcoming topics.

What does it mean when we say a string is immutable?

• The string cannot be changed once created.

• The string is stored in a temporary memory location.

• The string can be modified in place.

• The string can be changed directly.

What happens when you concatenate a string in Java?

• The original string is reversed.

• The original string is deleted.

• A new string is created.

• The original string is modified.

What is the result of calling the concat method on a string?

• A new string is returned.

• The original string is modified.

• The original string is deleted.

• The original string is reversed.

Which method would you use to convert a string to all uppercase letters?

• concat()

• toUpperCase()

• toLowerCase()

• trim()

How can you remove spaces from the start and end of a string?

• Using the toLowerCase() method

• Using the concat() method

• Using the trim() method

• Using the toUpperCase() method

What is the purpose of the toLowerCase() method?

• To convert a string to uppercase

• To remove spaces from a string

• To concatenate two strings

• To convert a string to lowercase

What is a key characteristic of a string once it is created in memory?

• It is stored in a temporary location.

• It is automatically deleted after use.

• It remains unchanged.

• It can be modified directly.