Greenfoot

Question 1

Code to check if the right keyboard arrow has been pressed

Answer 1

if (Greenfoot.isKeyDown (“Right”))
{

}

Question 2

Code to make an object point right

Answer 2

setRotation (0) ;

Question 3

Code to make an object point down

Answer 3

setRotation (90) ;

Question 4

Code to make an object point left

Answer 4

setRotation (180) ;

Question 5

Code to make an object point up

Answer 5

setRotation (270) ;

Question 6

Code to make an object move forward 1 space

Answer 6

move (1) ;

Question 7

Code to play a sound file called “pop.wav”

Answer 7

Greenfoot.playSound (“pop.wav”) ;

Question 8

Code to Generate a random number between 0-100

Answer 8

Greenfoot.getRandomNumber (100) ;

Question 9

Code to check if an object is at the edge of the world

Answer 9

if (isAtEdge())
{

}

Question 10

Code to make an object turn 45 degrees

Answer 10

turn (45) ;

Question 11

Code to check if the object is touching another (e.g. touching an object with the class name Snake)

Answer 11

if(isTouching(Snake.class))
{

}

Question 12

Code to remove an object from the game world that the object is touching (for example removing an object with the class name Heart)

Answer 12

removeTouching(Heart.class) ;

Question 13

Code to stop the program

Answer 13

Greenfoot.stop() ;

Question 14

Code to add 1 to the counter from another character

Answer 14

Counter counter = (Counter)getWorld().getObjects(Counter.class).get(0) ;
counter.add(1) ;

Question 15

Code to make the character turn a random angle between -45 and 45

Answer 15

turn(Greenfoot.getRandomNumber (90) -45);

Question 16

Code to carry out a part of the program a suitable amount (used for random turning)

Answer 16

if (Greenfoot.getRandomNumber (10) <1)
{

}

Question 17

How to set up the world subclass

Answer 17

Right click world and select new subclass
Choose image and name
Compile

Question 18

How to add a character

Answer 18

Right click actor and select new subclass
Choose image and name
Compile

Question 19

How to populate and save world

Answer 19

Right click on character and select “new …()”
Click where you want the character placed
Right click the background and click “save the world”

Question 20

How to code a character

Answer 20

Right click on the character and select open editor
Add code
Click compile in the characters editor window

Question 21

How to make an action constant

Answer 21

Add code outside of an if loop but still in the act loop. This section will be white

Question 22

To what character do you add the code for an item to be removed

Answer 22

The character that causes the removal by touching the character to be removed

Question 23

How to import a counter

Answer 23

Select edit, then import class, then counter
Compile
Add to world and save the world

Question 24

Where and to what character is the code to add one to the counter added to (if counter goes up for touching a collectable character)

Answer 24

Inside the isTouching if statement of the character that touched the collectable

Question 25

What is a superclass

Answer 25

A section heading e.g “World” or “Actor”

Question 26

What is a class

Answer 26

A subclass of a superclass e.g the character or map

Question 27

What method is run automatically

Answer 27

public void act()

Question 28

What is a private property

Answer 28

A method or attribute accessible in only its declared class

Question 29

What is a public property

Answer 29

A method or attribute accessible by any class