CodeHS 2.6 Booleans

What are the possible values that a boolean variable can hold in Java?

• 0 and 1

• True and False

• Yes and No

• On and Off

How do you declare a boolean variable in Java?

• int flag = true;

• boolean flag = 1;

• boolean flag = true;

• Boolean flag = "true";

Which of the following is a valid boolean expression in Java?

• 5 > 3

• "true" == true

• 1

• None of the above

What is the default value of a boolean variable in Java?

• 0

• false

• null

• undefined

Can a boolean in Java be cast to any other data type?

• Yes, to any type

• Yes, but only to a string

• No

• Yes, but only to an integer

Which keyword is used to represent boolean values in conditional statements, such as if-else in Java?

• int

• double

• boolean

• void

A boolean;

• Expresses a true/false statement
  

• can contain letters, numbers, spaces, and symbols.
  
• takes in an input, does something with it, and then returns an output.
  
• Runs a true/false statement based on data entered
  

Who created the boolean value?

• George Boole

• Paul Boole

• John Boole

• Ringo Boole

Which of these are Java keywords?

• boolean

• true

• false

• String

How many balls does Karel put down?