Java

TOPIC 13 – TEST I REVIEW

DETAILS & REVIEW

DETAILS

The test covers both Units 0 and 1. All notes. All work. All class discussion is fair game.

NOTE: In February 2021, we have excluded graphics from the test. So no NOOPDraw and no Processing. Your teacher will confirm if this will be the case moving forward.

Your test will be fully written. You will not have a computer.

Minor programming errors will not count against you.

The Java template will be provided for you. So you do not have to memorize the method prototype for the main function.

Function prototypes for Math and Graphics functions will be provided. So you do not need to memorize these functions. You do need to have a good idea how they work though.

REVIEW

QUESTION 1

Go over the following terms and make sure that you can define each one. Some will appear as part of multiple choice questions on the test.

Programming language Computer program Syntax Statement Machine language High level language Source code Compiler Interpreter Java compiler String concatenation

Java virtual machine Execute Java Run-time Environment Java Development Kit IDE Output statement Indenting Variable Boolean Double Integer

Data type Declaring a variable Initializing a variable Assignment statement Literals Arithmetic expression String Function argument/parameter Function return-type Function call

QUESTION 2

Which variable names follow the correct convention?

2daysDate

Length

plentyOfFun
senatorsrule
time left

fun

IWILLFAIL

QUESTION 3

Solve the following arithmetic expressions.

a) int a = 7 + 18 - 4;

b) int b = 43 % 6;

c) int c = 2 + 4 * 3;

d) int d = 6 - 3 * 2;

e) int e = 7 / 2;

f) double f = 9 / 2;

g) double g = 8 % 3 + 2;

h) double h = 3 * 6 % 5;

i) double i = (int)6.5 * 2;

j) double j = Math.sqrt(81);

k) double k = Math.pow(3,2);

l) double l = Math.pow(1+1, 3);

m) double m = Math.ceil(2.2 * 2);

n) double n = Math.round(4.3);

o) double o = Math.max(2*4,6+3);

p) double p = Math.min(Math.floor(4.2), Math.ceil(4.2));

q) double q = 1.0 / (1.5 + 0.5);

r) double r = Math.pow(Math.max(4,3), Math.min(2,3));

s) double s = Math.cbrt(27);

QUESTION 4 – PROGRAMMING QUESTIONS

Answer the following:

a) Consider a Point class that has two data fields (instance variables) called x and y. Write the statements required to create a Point object name p and give it the coordinates (6,2).

b) Write the Sword class. It has a String data field for its name and two int data fields for it's accuracy and damage.

c) Consider the Sword class from b. Write the statements needed to create the sword object called Excalibur that has an accuracy of 9 and a damage of 12.

d) Consider the following function from NOOPDraw:

public static void drawRectangle(double x, double y, double w, double h)

The function call NOOPDraw.drawRectangle(100,100,50,50) draws a

a) circle
b) square
c) triangle
d) a line
e) a pancake

e) The function call NOOPDraw.drawRectangle(0,0,100,50) is creating a rectangle that actually needs to be moved to the right by 40 pixels. Which of the following would be the corrected statement:

a) NOOPDraw.drawRectangle(40,0,100,50);
b) NOOPDraw.drawRectangle(0,40,100,50);
c) NOOPDraw.drawRectangle(0,0,140,50);
d) NOOPDraw.drawRectangle(0,0,100,90);
e) NOOPDraw.drawRectangle(0,-40,100,50);

f) The function call NOOPDraw.drawEllipse(200,240,100,100) is creating a circle that actually needs to be moved up by 10 pixels. Which of the following would be the corrected statement:

a) NOOPDraw.drawEllipse(210,240,100,100);
b) NOOPDraw.drawEllipse(200,250,100,100);
c) NOOPDraw.drawEllipse(200,240,110,100);
d) NOOPDraw.drawEllipse(200,240,100,110);
e) NOOPDraw.drawEllipse(200,230,100,100);

QUESTION 5 – SMALL PROGRAMS

Write the following programs.

a) Write the program that asks the user for their first, middle and last names. It then greets the user by saying "Hello name". Make sure you have appropriate spacing. You want to review using the Scanner object for this.

b) Ask the user for their age. Output the user’s year of birth. The output should look like this:

How old are you?

35

If your birthday passed this year, you were born in 1978.
If your birthday has not passed this year, you were born

in 1977.

c) Ask the user for the name of an item, its price and the tax rate (3 inputs in total). The program should output a sentence with the items name and it’s full price after taxes.

Here is some sample output:

Enter your item’s name:
Socks
Enter the price:
4.00
Enter the tax rate (whole number):
13
Socks cost 4.52 in total.

Good luck!

You’ll need it!

Just kidding!

No I’m not.

J