Java Exam 1

Front 1

JDK

Back 1

Java Development Kit

Front 2

JRE

Back 2

Java Runtime Environment

Front 3

What are the 5 steps of creating and running a Java program?

Back 3

1. Edit

2. Compile

3. Load

4. Verify

5. Interpret

Front 4

How do you compile on the commandline?

Back 4

javac *.java

Front 5

How do you run a Java program from the commandline?

Back 5

java classWithMainMethod.class

Front 6

How do you create a Javadoc?

Front 7

What are some common keywords/reserved words?

Back 7

new

class

public

static

void

final

switch

break

Front 8

What package is automatically imported?

Back 8

java.lang

Front 9

What is the convection for package naming?

Back 9

lowercase

'.' seperated

Front 10

What is a class' relationship to an object?

Back 10

Class is a definition

Object is an instance

Front 11

What is the naming convention for classes?

Back 11

UpperCamelCase

Front 12

What are the class access modifiers?

Back 12

public, protected, and private

Front 13

Modifier: abstract

Back 13

requires override

Front 14

Modifier: static

Back 14

restricts to one instance

Front 15

Modifier : final

Back 15

prohibits value modification

Front 16

What is the purpose of methods?

Back 16

Code reuse

Front 17

What is the difference between a function and a method?

Back 17

Function - Not tied to a class

Method - Member of a class

Front 18

What is the syntax for the main method?

Back 18

public static void main ( String args[] )

Front 19

What is the convention for naming methods?

Back 19

lowercase verbs

Front 20

What is the convention for naming constants?

Back 20

ALL_CAPS

Front 21

What are the 8 primitive data types?

Back 21

boolean

char

byte

short

int

long

float

double

Front 22

What are the 4 primitive data type categories?

Back 22

Integer

Floating Point

Character

Boolean

Front 23

What is a reference?

Back 23

IT'S A POINTER!

Front 24

What are the conventions for naming variables?

Back 24

lowercase nouns

Front 25

What is the output:

System.out.print ( "Sum: " + 5 + 3 ); ?

Back 25

Sum: 53

Front 26

What type is the result?

int/double

double/int

Back 26

double

double

Front 27

What package does String belong to?

Back 27

java.lang

Front 28

What does immutable mean?

Back 28

Its state cannot change after it is constructed.

Front 29

What is interning?

Back 29

While the values of multiple variables are equal, they point to the same memory location.

Front 30

What makes a class static?

Back 30

a private default constructor

Front 31

Name 2 static java classes.

Back 31

Math

System

Front 32

What is the difference?

String a, b;

1) a.compareTo ( b ) ;

2) a.equals ( b ) ;

3) a == b ;

Back 32

1) lexicographic order

2) boolean (compare strings)

3) boolean (compare pointers)

Front 33

What are the parts of a GUI?

Back 33

Stage

Scene

Node

- Control

- Image View

- Shape

- Pane

Front 34

What method initiates a GUI program?

Back 34

The start method.

Front 35

How is the coordinate system defined?

Back 35

( 0, 0 ) is in the top left corner

Front 36

What are the 6 options for printf ?

Back 36

%b - boolean

%c - character

%d - decimal

%f - float

%e - scientific notation

%s - string

Front 37

How do you declare a console Scanner?

Back 37

Scanner myScanner = new Scanner ( System.in ) ;

Front 38

How do you get input from a scanner?

Back 38

.next ( ) //string

.nextInt ( ) //integer

.next ( ) //double, float, etc...

Front 39

How do you declare a file Scanner?

Back 39

Scanner myFileScanner =

new Scanner ( new FileReader ( fileName ) ) ;

Front 40

How do you check if a Scanner has something to read?

Back 40

.hasNext ( ) //string

.hasNextInt ( ) //integer

.hasNext ( ) //double, float, etc...

Front 41

How do you declare a file writing PrintWriter?

Back 41

PrintWriter myPrintWriter = new PrintWriter (

new FileOutputStream ( fileName, bool append ));

Front 42

How do you print to a file?

Back 42

myPrintWriter.print ( "Stuff" ) ;

myPrintWriter.println ( "Stuff" ) ;

myPrintWriter.printf ( "Stuff" ) ;

Front 43

What are the types of Alerts?

Back 43

Alert.AlertType.

INFORMATION

WARNING

ERROR

CONFIRMATION

Front 44

What are the types of dialogs?

Back 44

ChoiceDialog

TextInputDialog

Alert

Front 45

What needs to extend the Application class?

Back 45

Your Class that handles the GUI

Front 46

What arguments does the start method take?

Back 46

public void Start ( Stage primaryStage ) {

}

Front 47

How do you display a dialog?

Back 47

dialog.show ( )

Front 48

How do you get input from a dialog?

Back 48

Type return = dialog.showAndWait ( ) ;

Front 49

How do you set the title of a dialog?

Back 49

dialog.setTitle ( "title" ) ;

Front 50

What are the five ways to handle events?

Back 50

* anonymous inner class

* lambda function

* handle method

*

*