U2: Summative

Question 1

Counters and Scores

Answer 1

Use technique variable = variable + 1 for adding score

Question 2

Variables using Custom Data Types (Classes)

Answer 2

• All programs written in Java contain classes
• Examples of custom data types: Strings from String Class, Scanner from Scanner Class

Question 3

Predefined Subprograms

Answer 3

• Pre-existing program allowing task to be accomplished quickly
• Ex: Math.round(), Integer.ParseInt()

Question 4

Random Numbers

Answer 4

• randomNumber = (int)Math.round(Math.random()*[n-1]+1)
• Generates between 1 and n

Question 5

Creating Random Object

Answer 5

• Random random = new Random()
• Written at start of program to allow random values to come

Question 6

Casting a Value to Double

Answer 6

• Add (double) at the left of variable
• Ex: int numCorrect; (double) numCorrect
• Can cast to integer, other value as well

Question 7

break (code)

Answer 7

Ends a program

Question 8

.equals Subroutine

Answer 8

• Used for strings instead of the == sign
• Ex: if (variable1.equals (variable2))