Java Basics

Question 1

What is it important to note with brackets?

Answer 1

For ever open bracket ( { [ …
There is a close bracket ) } ]

Question 2

Write the skeleton/framework

Answer 2

import arc.*;

public class -name-{
public static void main(String [] args){
Console con = new Console();

 } }

Question 3

Location of Import Commands

Answer 3

top of the program

Question 4

Function of Import Command

Answer 4

to import different programming libraries

Question 5

What do Libraries give?

Answer 5

access to specific Java commands

Question 6

to import different programming libraries

Answer 6

Function of Import Command

Question 7

Write the import command for the arc library.

Answer 7

import arc.*;

Question 8

Function of this command:

import arc.*:

Answer 8

imports the arc library

Question 9

Function of this command:

public class javabasics2{

}

Answer 9

title of the java program

note: the title needs to match the saved file title exactly

Question 10

Notes about the title:

Answer 10

no spaces
cannot start with a number
no special characters

Question 11

What file extension name should you save your programs under?

Answer 11

.java

Question 12

Function of this command:

public static void main(String[] args){

}

Answer 12

represents the main method of the java program

Question 13

What do all Java programs have?

Answer 13

a public static void main

Question 14

Function of this command:

Console con = new Console();

Answer 14

provides Console window

Question 15

Function of Console window

Answer 15

number and text input
text or graphics output

Question 16

Function of RAM Command

Answer 16

Tells RAM to reserves space for future data

Question 17

Tells RAM to reserves space for future data

Answer 17

Function of RAM Command

Question 18

number and text input
text or graphics output

Answer 18

Function of Console Window

Question 19

Write the code which provides a console window.

Answer 19

Console con = new Console ();

Question 20

Write the command which provides the main method of the program.

Answer 20

public static void main(String [] args){

}

Question 21

Data type that holds integer data

Answer 21

int

Question 22

int

Answer 22

data type that holds integer data

Question 23

Function of GPU/Monitor Output Command

Answer 23

tells computer to print whatever is in quotes to the screen + data in variables

Question 24

Write an example of GPU/Monitor Command

Answer 24

con.println(“example”);

or

con.print(“example”);

or

con.println(“example” + intVariable);

Question 25

con.println (); vs con.print(“something”);

Answer 25

println – cursor goes to next line
print – cursor stays on same line

Question 26

Function of Keyboard Input Command

Answer 26

tells computer to read integer/double/string data from the keyboard AND put data into the variable

Question 27

Write an example of Keyboard Input Command

Answer 27

intVariable = con.readInt();
or
dblVariable = con.readDouble();
or
strVariable = con.readLine();

Question 28

Where is the data of variables stored?

Answer 28

in RAM

Question 29

Function of CPU Math Command

Answer 29

• tells CPU to perform calculations on the r.h.s. of the ‘=’
• puts results into variable on l.h.s. of the equal sign

Question 30

Function of %

Answer 30

Modulus sign - does integer division but takes remainder

Question 31

Data type that holds real number data

Answer 31

double

Question 32

double

Answer 32

Data type that holds real number data

Question 33

Symbol for Comments

Answer 33

//

Question 34

Purpose for Writing Comments

Answer 34

• organize code
• explain complex thought processes
• communitcate with team member reading your code
• understand what a part of code does when revisiting it

Question 35

Unit of measurement of angles in trigonometry calculations in Java

Answer 35

radians

Question 36

String

Answer 36

data type which holds words, letters, punctuation, and numbers

note: cannot do math with numbers

Question 37

Write an example of setting variables as string data

Answer 37

String strVariable;

Question 38

Write an example of setting variables as integer data

Answer 38

int intVariable;

Question 39

Write an example of setting variables as double data

Answer 39

double dblVariable;

Question 40

Math.min

Answer 40

compares two numbers and gets smallest

Question 41

Math.max

Answer 41

compares two numbers and gets the biggest

Question 42

Math.round

Answer 42

rounds to nearest decimal point

Question 43

Math.toRadians

Answer 43

converts degree –> radians