Introduction to Java

Question 1

What does OOP stand for?

Answer 1

Object Oriented Programming

Question 2

what does OOP help with?

Answer 2

OOP simplifies software development and maintenance by providing some rules

Question 3

In OOP languages everything is associated with?

Answer 3

classes, objects, attributes and methods

Question 4

a class is _______________ or generic description

Answer 4

blueprint

Question 5

a class contains?

Answer 5

general attributes or properties

Question 6

Objects are created from a _________

Answer 6

class

Question 7

TRUE or FALSE…
an object represents specific attributes values that apply

Answer 7

True

Question 8

TRUE or FALSE…
Attributes is the information stored in a method.

Answer 8

False. Attributes is the information stored within an object. It represents the data of an object.

Question 9

Method represents what…methods perform what…..

Answer 9

methods represents behaviors and perform actions.

Question 10

What are the main data types?

Answer 10

int
float
char
boolean
string

Question 11

what is a variable?

Answer 11

a variable is used to store values in Java for later use.
example int age = 65; or String name = “Jonny”

Question 12

what is an array used to store?

Answer 12

multiple values in a single variable

Question 13

Which of the following is the correct way to code an array?

A.
String [] trees = {"oak, spruce, pine"};

B.
String trees [] = {"oak", "spruce", "pine"};

C.
String trees = {"oak", "spruce", "pine"};

D.
String [] trees = {"oak", "spruce", "pine"};

Answer 13

D.
String [] trees = {“oak”, “spruce”, “pine”};

Question 14

What is the code needed to make this if work?

            String color = "red";
	
	if (color == "blue") {
		System.out.println("I'm sorry please pick red");
	} elseif {
		System.out.println("RED");
	}

Answer 14

elseif should look like elseif (color == “red”)
String color = “red”;

	if (color == "blue") {
		System.out.println("I'm sorry please pick red");
	} elseif (color == "red") {
		System.out.println("RED");
	}

Question 15

What is a class?

Answer 15

a structure where we define attributes and methods, which are utilized by the objects.

Question 16

how do you create a class?

Answer 16

use the class keyword followed by the name of the class
example class bird {

Question 17

what does the Main Method do?

Answer 17

the Main Method initiates the program.

Question 18

True or False:
Does letter case matter in java?

Answer 18

true

Question 19

does the main method come before or after the class?

Answer 19

after
the syntax should look like…..

public class MyClass {
public static void main() {
//System.out.println(“example”);
}
}

Question 20

What must the class name match?

Answer 20

the class name must match the file name.

Question 21

what is a class diagram?

Answer 21

its a blueprint of a class.

Question 22

what does a class diagram show?

Answer 22

a class diagram shows the names and attributes of the classes, relationships between classes, and sometimes the methods of the classes.

Question 23

write this code out based on the class diagram (each box will instead be a number)

1. Store
2. • name: String
3. • address: String
4. • Store(name:String, address: String)
5. +open(): String
6. +close(): void

Answer 23

class Store {
private String name;
private String address;

public Store (String name, string address) {
	//do things
}

public String open () {
	//do things
}

public void close () {
	//do things
} }

Question 24

what does class diagrams NOT do

Answer 24

class diagrams does not describe functionality.

Question 25

what is a sequence diagram?

Answer 25

a sequence diagram is a plan for how code will interact with each other and the order they will interact.