csci

Question 1

What is Java?

Answer 1

An object-oriented programming language that is safe and platform independent.

Question 2

What are the two types of Java programs?

Answer 2

• Applications
• Applets (now outdated and deprecated)

Question 3

Define Java Applications.

Answer 3

General-purpose programs that are standalone and executed through the operating system.

Question 4

Define Java Applets.

Answer 4

Programs meant for the WWW, embedded in a Web page, normally executed through a browser.

Question 5

What is the structure of a Java program?

Answer 5

• (optional) import declarations
• class declaration

Question 6

What should the class name match in Java?

Answer 6

The file name.

Question 7

What is a Command Line Interface?

Answer 7

An entirely text-based system where the user types commands from the keyboard.

Question 8

What is a shell in the context of a Command Line Interface?

Answer 8

A program that interprets and processes commands entered in the command line interface.

Question 9

Name two commonly used shells on Windows.

Answer 9

• Command Prompt
• PowerShell

Question 10

Name two commonly used shells on Mac and Linux.

Answer 10

• Bash
• Zsh (Z Shell)

Question 11

What does the command ‘md <folder-name>' do in Windows?</folder-name>

Answer 11

Creates a new folder.

Question 12

What does the command ‘copy <source-file> <dest-file>' do in Windows?</dest-file></source-file>

Answer 12

Copies the <source></source> to a file called <dest-file>.</dest-file>

Question 13

What does the command ‘del <file.ext>' do in Windows?</file.ext>

Answer 13

Deletes a file.

Question 14

What is the command to compile a Java program?

Answer 14

javac <java-source-file></java-source-file>

Question 15

What is the command to execute a Java program?

Answer 15

java <java-class-name></java-class-name>

Question 16

What does ‘javadoc <java-source-file>' do?</java-source-file>

Answer 16

Generates Java documentation.

Question 17

What does ‘javap <java-class-name>' do?</java-class-name>

Answer 17

Prints information about the Java class.

Question 18

What is an object in Java?

Answer 18

A ‘thing’ that has type, identity, state, and behavior.

Question 19

What defines the ‘type’ of an object?

Answer 19

It belongs to a ‘class’ of similar objects.

Question 20

What is the ‘identity’ of an object?

Answer 20

A distinct ‘instance’ of a class of objects.

Question 21

What does the ‘state’ of an object refer to?

Answer 21

A set of properties (fields) each field can have different values.

Question 22

What is ‘behavior’ in terms of an object?

Answer 22

Methods that the object knows how to do.

Question 23

What is a class in Java?

Answer 23

A definition that can have multiple instances, where each instance is a separate object.

Question 24

What is a mutator method?

Answer 24

A method that primarily modifies an object’s state.

Question 25

What is an accessor method?

Answer 25

A method that returns something about an object.

Question 26

What is a format specifier?

Answer 26

A sequence that starts with % and specifies how to format an argument.

Question 27

What does the conversion character ‘d’ represent in format specifiers?

Answer 27

Integer.

Question 28

What does the conversion character ‘f’ represent in format specifiers?

Answer 28

Float.

Question 29

What does the conversion character ‘s’ represent in format specifiers?

Answer 29

String.

Question 30

What does the conversion character ‘c’ represent in format specifiers?

Answer 30

Character.

Question 31

What is the optional width in a format specifier?

Answer 31

Minimum number of spaces to display the argument.

Question 32

What is the optional precision in a format specifier?

Answer 32

Number of digits after the decimal point.