Complete Java SE 8 Developer Bootcamp - Using Objects

The video tutorial introduces the concept of objects and methods in Java, explaining how objects encapsulate state and behavior. It covers the use of dot notation to invoke methods, discusses string methods and their immutability, and explains instance variables as a representation of an object's state. The tutorial provides examples to illustrate these concepts, emphasizing the syntax differences between methods and variables.

What is the primary purpose of a method in Java?

• To store data

• To execute behavior

• To define classes

• To manage memory

Which notation is used to invoke a method on an object in Java?

• Dot notation

• Comma notation

• Semicolon notation

• Colon notation

What happens if a method returns void?

• It returns a string

• It returns an integer

• It returns nothing

• It returns a boolean

What does the substring method return when called on a string?

• An integer

• The same string

• A new string

• A boolean

What is a key characteristic of strings in Java?

• They are always null

• They are always empty

• They are immutable

• They are mutable

What does the trim method do to a string?

• Converts to lowercase

• Adds spaces

• Removes spaces

• Converts to uppercase

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

• The string is converted to uppercase

• The string is converted to lowercase

• The string is trimmed

• The string is reversed

What is another term for instance variables in Java?

• Packages

• Classes

• Attributes

• Methods

How can you differentiate between a method and a field in Java?

• Fields are always private

• Methods are always public

• Methods have parentheses

• Fields have parentheses

What is the purpose of the assignment operator in Java?

• To assign values

• To compare values

• To invoke methods

• To declare variables