OOP - Week 1

Question 1

Why is Object Oriented Programming useful

Answer 1

It makes programming similar to thinking about the real world

Question 2

What is the name of variables in an object

Answer 2

Fields

Question 3

What is the name of functions in an object

Answer 3

Methods

Question 4

How are objects created

Answer 4

Using classes

Question 5

Advantages of OOP vs Procedural

Answer 5

More secure, readable and reusable, easier to maintain/debug

Question 6

Disadvantages of OOP vs Procedural

Answer 6

Needs more lines of code
Slower programs
Steep learning curve

Question 7

What do {} do for classes

Answer 7

They mark the body of the class

Question 8

What must a java app have

Answer 8

A main method as an execution point of the program

Question 9

What is the signature of the main() method

Answer 9

public static void main(String[] args)

Question 10

Commenting in Java

Answer 10

Single line - //

Multi line - /* */

Question 11

Variable steps

Answer 11

Declaration - Data type and name
Initialisation - Initial value
Assignment - Value replacement

Question 12

What are the java float data types

Answer 12

Float (32-bit)

Double (64-bit)

Question 13

What do x++ and x– mean

Answer 13

x+1 and x-1

Question 14

What is the difference between b=a++ and b=++a

Answer 14

b=a++ adds 1 to a after making b equal to a

Question 15

How to make a float not count as a double

Answer 15

Add f to the end of the number

Question 16

When are two data types automatically converted

Answer 16

When the two data types are compatible

When a smaller value is assigned to a bigger data type (e.g float to double)