CS506 Highlighted Handouts Set 3

Lecture 1: Java Features ..................................................................................... 22

1.1

Design Goals of Java ................................................................................................... 22

1.1.1

Right Language, Right Time ................................................................................ 22

1.1.2

Java - Buzzwords (Vocabulary) ............................................................................ 22

1.1.3

Java -- Language + Libraries ................................................................................ 22

1.1.4

Simple .................................................................................................................. 23

1.1.5

Object-Oriented .................................................................................................... 23

1.1.6

Distributed / Network Oriented ............................................................................ 23

1.1.7

Robust / Secure / Safe .......................................................................................... 23

1.1.8

Portable ................................................................................................................ 24

1.1.9

Support for Web and Enterprise Web Applications ............................................... 24

1.1.10

High-performance ................................................................................................ 24

1.1.11

Multi-Threaded .................................................................................................... 24

1.1.12

Dynamic .............................................................................................................. 24

1.1.13

Java Compiler Structure ....................................................................................... 24

1.1.14

Java: Programmer Efficiency................................................................................ 25

1.1.15

Microsoft vs. Java ................................................................................................ 25

1.1.16

Java Is For Real .................................................................................................... 25

1.1.17

Lecture 2: Java Virtual Machine & Runtime Environment .............................. 26

2.1

Basic Concept ............................................................................................................. 26

2.1.1

Byte code ............................................................................................................. 26

2.1.2

Java Virtual Machine (JVM) ................................................................................ 27

2.1.3

Java Runtime Environment (JRE) ........................................................................ 27

2.1.4

2.2

Java Program Development and Execution Steps......................................................... 28

2.2.1

Phase 1: Edit ........................................................................................................ 30

2.2.2

Phase 2: Compile ................................................................................................. 30

2.2.3

Phase 3: Loading .................................................................................................. 30

2.2.4

Phase 4: Verify ..................................................................................................... 30

2.2.5

Phase 5: Execute .................................................................................................. 31

2.2.6

2.3

Installation and Environment Setting ............................................................................. 31

2.3.1

Installation. .......................................................................................................... 31

2.3.2

Environment Setting ............................................................................................. 31

2.3.2.1

Temporary Path Setting ............................................................................................... 31

2.3.2.2

Permanent Path Setting................................................................................................ 32

2.3.3

2.4

First Program in Java.................................................................................................... 34

2.4.1

HelloWorldApp .................................................................................................... 34

2.4.2

HelloWorldApp Described ................................................................................... 35

2.4.3

Compiling and Running HelloWorldApp .............................................................. 35

2.4.4

Points to Remember ............................................................................................. 36

2.5

An Idiom Explained .................................................................................................... 36

2.6

Lecture 3: Learning Basics ................................................................................. 38

3.1

Strings. ........................................................................................................................ 38

3.1.1

String Concatenation ............................................................................................ 38

3.1.2

Comparing Strings ............................................................................................... 38

3.2

Taking in Command Line Arguments .......................................................................... 39

3.3

Primitives vs. Objects .................................................................................................. 40

3.4

Stack vs. Heap ............................................................................................................. 41

3.5

Wrapper Classes .......................................................................................................... 41

3.5.1

Wrapper Use ........................................................................................................ 42

3.5.2

Converting Strings to Numeric Primitive Data Types ........................................... 42

3.6

Selection & Control Structure ...................................................................................... 44

3.7

Reference: ................................................................................................................... 44

Lecture 4: Object Oriented Programming ......................................................... 45

4.1

OOP Vocabulary Review ............................................................................................ 45

4.1.1

Classes ................................................................................................................. 45

4.1.2

Objects ................................................................................................................. 45

4.1.3

Constructor........................................................................................................... 45

4.1.4

Attributes ............................................................................................................. 45

4.1.5

Methods ............................................................................................................... 45

4.2

Defining a Class ........................................................................................................... 45

4.3

Comparison with C++ ................................................................................................. 46

4.4

Task - Defining a Student class ................................................................................... 47

4.5

Getters / Setters ........................................................................................................... 47

4.6

Using a Class ............................................................................................................... 48

4.6.1

Task - Using Student Class ................................................................................... 49

4.7

More on Classes .......................................................................................................... 50

4.7.1

Static .................................................................................................................... 50

4.7.2

Garbage Collection & Finalize ............................................................................. 50

4.7.2.1

Finalize ....................................................................................................................... 51

4.8

Reference: ................................................................................................................... 54

Lecture 5: Inheritance ......................................................................................... 55

5.1

Comparison with C++ ................................................................................................. 55

5.2

Object - The Root Class .............................................................................................. 58

5.3

Polymorphism ............................................................................................................. 58

5.4

Type Casting ............................................................................................................... 60

5.4.1

Up-casting ............................................................................................................ 60

5.4.2

Down-casting ....................................................................................................... 60

5.5

Lecture 6: Collections.......................................................................................... 60

6.1

Collections Design ...................................................................................................... 61

6.2

Collection messages .................................................................................................... 61

6.3

Array List .................................................................................................................... 61

6.3.1

Useful Methods .................................................................................................... 61

6.4

HashMap ..................................................................................................................... 63

6.4.1

Useful Methods .................................................................................................... 63

6.5

6.6

Address Book .............................................................................................................. 65

6.6.1

Problem................................................................................................................ 65