Programming Basics

Question 1

What does the term ‘white space’ mean?

Answer 1

The term white space refers to one of more consecutive space characters, tab characters, or line breaks.

Question 2

What is a block?

Answer 2

A block is a group of one or more statements that’s enclosed in braces.

Question 3

What is an identifier?

Answer 3

An identifier is a word that you make up to refer to a Java programming element by name.

Question 4

What is the state of an object?

Answer 4

The state of an object consists of any data that the object might be keeping track of.

Question 5

What is the behavior of an object?

Answer 5

The behavior of an object consists of actions that the object can perform.

Question 6

What does the static keyword mean?

Answer 6

It means that you can call a method without first creating an instance of a class, because static methods are called from classes, not objects.

Question 7

Creating an object from a class

Answer 7

ClassName variableName = new ClassName(Paramater-list);

Question 8

Importing Java classes.

Answer 8

import package.class.method;

Question 9

What is a class variable?

Answer 9

A class variable is a variable that any method in a class can access, including static methods such as main.

Question 10

What is a local variable?

Answer 10

A local variable is a variable that’s declared within the body of a method.

Question 11

What is a final variable?

Answer 11

A final variables, also called a constant, is a variable whose value you can’t change after it’s been intialized. To declare a final variable you must use the final keyword. Ex) final int WEEKDAYS = 5;

Question 12

What are primitive types?

Answer 12

Primitive types are the data types defined by the language itself.

Question 13

What are reference types?

Answer 13

Reference types are types defined by classes in the Java application programming interface, or by classes you create rather than by the language itself.

Question 14

What is an integer?

Answer 14

An integer is a whole number that is, a number with no fractional or decimal portion.

Question 15

What value can an integer hold?

Answer 15

Any value from -2 billion to +2 billion

Question 16

What value can a byte hold?

Answer 16

Any valye from -128 to +128

Question 17

What value can a short hold?

Answer 17

Any value from -32,687 to +32.687

Question 18

What value can a long hold?

Answer 18

Any value from -9,000 trillion to +9,000 trillion

Question 19

How many decimal points can a float type hold?

Answer 19

6 to 7 decimal points

Question 20

How many decimal points can a double hold?

Answer 20

Aboout 15 digits

Question 21

Primitive Data Types

Answer 21

int, short, long, byte, float, double, char, boolean

Question 22

What is a decrement operator?

Answer 22

– subtracts 1 from the value

Question 23

What is an increment operator?

Answer 23

++ adds 1 to the value

Question 24

What is a while loop?

Answer 24

A loop that executes continuously as long as some conditional expression evaluates to true

Question 25

What is a do-while loop?

Answer 25

A do-while loop is similar to a while loop, but with a critical difference: In a do-while loop, the condition that stops the loop isn’t tested until after the statements in the loop have been executed.