AP CS A Unit 1 Quiz Review

Match the following Java terms to their meanings.

• String

• A reference (class) data type for character data

• Scanner

• Send output to the display and advance to the next line

• print

• Send output to the display and stay on the same line

• nextLine

• A class used to collect user input

• println

• A method of the Scanner class used to accept character data input

Which of the following java statements correctly declares a variable and sets it to the value 2.87?

• int x = 2.87;

• decimal x = 2.87;

• float x = 2.87

• double x = 2.87;

• real x = 2.87;

Order the following from smallest to largest memory storage size:

• int

• double

• String

• boolean

Which statement correctly inputs an integer using a properly initialized Scanner variable?

• int num = nextScan(int);

• int num = scan.nextNumber();

• int num = scanNextInt();

• int num = scan.nextLine();

• int num = scan.nextInt();

Which is a valid variable name in Java?

Select ALL that apply.

• String

• ip.address

• address_1

• 2ndplace

• lastName

Which variable assignment is valid in java?

• double k = 13;

• int b = 2.0;

• double r = "3.14";

• String f = 0;

• String w = 98.6;

System.out.println() accepts which datatype(s) as parameters?

• String

• double

• int

• boolean

System.out.println() converts all input parameters to which output type?

• Scanner

• String

• double

• int

• boolean

Regarding primitive datatypes, select ALL true statements from the options below?

• They can hold strings and numbers at the same time

• They contain only one piece of data at a time

• They can only store numeric data

• They have built-in methods (functions)

• There are multiple primitive data types

Which of the following are reference (class) data types?

I. String

II. boolean

III. double

• I only

• I and III only

• II only

• II and III only

• I, II, and III