Final-Java Chap 1 Gaddis

Question 1

What team was started by what company in 1991?

Answer 1

Green Team started by Sun Microsystems

Question 2

What did the Green Team work on?

Answer 2

A handheld controller for multiple entertainment systems.

Question 3

What did they need next?

Answer 3

They needed a programming language that would run on various devices. Java.

Question 4

What was Java first named?

Answer 4

Oak

Question 5

What was demonstrated at the 1995 Sun World conference?

Answer 5

a Java enabled web browser (Hot Java)

Question 6

Shortly after…

Answer 6

Java incorporated into Netscape.

Question 7

cross platform

Answer 7

can run on various computer operating systems

Question 8

Java programs can be of 2 types

Answer 8

Applications and Applets

Question 9

Applications

Answer 9

stand-alone programs that run without the web. Relaxed security model since the program is run locally

Question 10

applets

Answer 10

small applications that require the use of a java enables web browser to run. Enhanced security model.

Question 11

program

Answer 11

a set of instructions (algorithm) a computer follows in order to perform a task

Question 12

A computer needs the algorithm to be written in

Answer 12

machine language

Question 13

machine language in written using

Answer 13

binary numbers

Question 14

Each CPU has

Answer 14

its own machine language

Question 15

first programming language

Answer 15

assembler

Question 16

Assembler was

Answer 16

processor dependent

Question 17

common concepts:

Answer 17

key words, operators, punctuation, programmer-defined identifiers, strict syntactic rules

Question 18

sample program (Hello world)

Answer 18

public class HelloWorld
{
    public static void main (string[] args)
     {
          String message = "Hello World";
          System.out.println(message);
     }
}

Question 19

is Java case sensitive?

Answer 19

yes

Question 20

key words are

Answer 20

lower case

Question 21

some examples of key words are

Answer 21

public, class, static, void

Question 22

key words cannot be used as a

Answer 22

programmer-defined identifier

Question 23

semi-colons are used

Answer 23

to end Java statements

Question 24

statement

Answer 24

not just a line; a complete Java instruction that causes the computer to perform an action

Question 25

Data is stored...

Answer 25

in memory

Question 26

Variable names represent...

Answer 26

a location in memory

Question 27

variables in Java are sometimes called

Answer 27

fields

Question 28

variables are created

Answer 28

by the programmer who assigns it a programmer-defined identifier ex: int hours=40 where hours is the variable

Question 29

decides where the value will be placed in memory

Answer 29

Java Virtual Machine (JVM)

Question 30

source code

Answer 30

Java programming statements

Question 31

text editor

Answer 31

used to edit and save a Java source code file

Question 32

extension for source code files

Answer 32

.java

Question 33

compiler

Answer 33

a program that translates source code into an executable form

Question 34

A compiler is run by

Answer 34

using a source code file as input

Question 35

When are syntax errors discovered?

Answer 35

During compilation

Question 36

syntax errors

Answer 36

violate the rules of the programming language

Question 37

most compilers translate source code into

Answer 37

executable files containing machine code

Question 38

The Java compiler translates a Java source file into a file that contains

Answer 38

byte code instructions

Question 39

Byte code instructions

Answer 39

the machine language of the Java Virtual Machine and cannot be directly executed directly by the CPU

Question 40

byte code files end with

Answer 40

.class file extension

Question 41

the JVM is a program that

Answer 41

emulates a microprocessor

Question 42

JVM executes instructions

Answer 42

as they are read

Question 43

JVM often called

Answer 43

an interpreter

Question 44

Java is often referred to as

Answer 44

an interpreted language

Question 45

program development process

Answer 45

1) text editor saves the Java statements as source code(.java) 2) The source code is read by the Java compiler, which produces the byte code (.class) 3) The byte code is interpreted by the JVM, which results in program execution

Question 46

portable

Answer 46

a program may be written on one type of computer and then run on a wide variety of computers with little of no modification

Question 47

Java programs are highly portable because

Answer 47

Java byte code runs on the JVM and not on any particular CPU

Question 48

By providing a JVM for each platform

Answer 48

Java does not require programmers to recompile for different platforms

Question 49

JDK

Answer 49

Java Development Kit; the software used to write Java programs

Question 50

The Java compiler is a

Answer 50

command line utility

Question 51

command to compile a program

Answer 51

javac filename.java

Question 52

the Java compiler

Answer 52

javac

Question 53

procedure

Answer 53

a set of programming language statements that, together, perform a specific task

Question 54

procedures typically

Answer 54

operate on data items that are separate from the procedures

Question 55

in procedural programs

Answer 55

1) the data items are commonly passed from on procedure to another 2) procedures are developed to operate on the programs data 3) Data in the program tends to be global 4) data formats might change and thus the procedures that operate on that data must change

Question 56

object-oriented programming

Answer 56

centered on creating objects rather than procedures

Question 57

objects are

Answer 57

a melding of data and procedures that manipulate data

Question 58

attributes

Answer 58

data in an object

Question 59

methods

Answer 59

procedures in an object

Question 60

data hiding is a part of what type of programming?

Answer 60

object-oriented

Question 61

Why is data hiding important?

Answer 61

1) protects attributes from accidental corruption by outside objects 2) hides the details of how an object works to help programmer concentrate on using it 3) allows object to be modified without breaking code

Question 62

Code reusability is encouraged by

Answer 62

object-oriented programming

Question 63

component

Answer 63

a software object that contains data and methods that represent a specific concept of service

Question 64

Are components stand-alone programs?

Answer 64

Not typically

Question 65

Components can be used by

Answer 65

programs that need the component's service

Question 66

reuse of code promotes

Answer 66

the rapid development of larger software projects

Question 67

components =

Answer 67

objects

Question 68

the programmer determines the attributes and methods needed, and then creates a

Answer 68

class

Question 69

class

Answer 69

a collection of programming statements that define the required object; a "blueprint" that objects may be created from

Question 70

an object is the

Answer 70

realization (instantiation) of a class in memory

Question 71

Are classes limited in how many objects they can instantiate?

Answer 71

no.

Question 72

instance of the class

Answer 72

each object that is created from a class

Question 73

a program is simply

Answer 73

a collection of objects that interact with each other to accomplish a goal

Question 74

inheritance

Answer 74

the ability of one class to extend the capabilities of another

Question 75

example of inheritance

Answer 75

The class Car is a specialized form of the Vehicle class. So, the Vehicle class is the base (parent) class and Car is the derived (child) class.