"Unleashing the Power of JavaScript: A Beginner's Guide to Dynamic Web Development"
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Course
Basic of java script
Institution
JavaScript is a versatile and widely-used programming language primarily known for adding interactivity to websites. For beginners, here’s an introduction to key aspects of JavaScript:
1. What is JavaScript?
JavaScript (often abbreviated as JS) is a programming language that runs in the bro...
An introductory course for Advanced IT Students and those who would Riccardo
like to learn the Java programming language.
Flask
, JAVA for Beginners
Contents
Introduction ............................................................................................................................................................ 5
About JAVA ............................................................................................................................................................. 5
OOP – Object Oriented Programming .................................................................................................................... 5
Part 1 - Getting Started ........................................................................................................................................... 6
The Java Development Kit – JDK ........................................................................................................................ 6
My first Java program......................................................................................................................................... 6
Using an IDE ....................................................................................................................................................... 7
Variables and Data Types ....................................................................................................................................... 8
Variables ............................................................................................................................................................. 8
Test your skills – Example3................................................................................................................................ 8
Mathematical Operators .................................................................................................................................... 9
Logical Operators ............................................................................................................................................... 9
Character Escape Codes ................................................................................................................................... 11
Test your skills – Example7............................................................................................................................... 12
Data Types ........................................................................................................................................................ 13
Introducing Control Statements ....................................................................................................................... 16
Blocks of Code .................................................................................................................................................. 18
Test your skills – Example14 ................................................................................................................................. 18
The Math Class ................................................................................................................................................. 19
Scope and Lifetime of Variables ....................................................................................................................... 20
Type Casting and Conversions .......................................................................................................................... 21
Console Input ................................................................................................................................................... 24
Using the Keyboard Class ............................................................................................................................. 24
Using the Scanner Class ............................................................................................................................... 33
Using Swing Components ............................................................................................................................ 34
Part 2 - Advanced Java Programming ................................................................................................................... 35
Control Statements - The if Statement ................................................................................................................. 35
Guessing Game (Guess.java) ............................................................................................................................ 36
Nested if ............................................................................................................................................................... 37
Guessing Game v.3 ........................................................................................................................................... 37
if-else-if Ladder ..................................................................................................................................................... 38
Ternary (?) Operator ............................................................................................................................................. 39
switch Statement (case of) ................................................................................................................................... 41
Nested switch ....................................................................................................................................................... 45
Mini-Project – Java Help System (Help.java) ........................................................................................................ 45
Complete Listing .......................................................................................................................................... 46
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, JAVA for Beginners
The for Loop.......................................................................................................................................................... 48
Multiple Loop Control Variable ........................................................................................................................ 50
Terminating a loop via user intervention ......................................................................................................... 50
Interesting For Loop Variations ........................................................................................................................ 51
Infinite Loops .................................................................................................................................................... 52
No ‘Body’ Loops................................................................................................................................................ 52
Declaring variables inside the loop .................................................................................................................. 52
Enhanced For loop ........................................................................................................................................... 53
The While Loop ..................................................................................................................................................... 54
The do-while Loop ............................................................................................................................................ 55
Mini-Project 2– Java Help System (Help2.java) .................................................................................................... 58
Complete listing ........................................................................................................................................... 59
Using Break to Terminate a Loop ......................................................................................................................... 62
Terminating a loop with break and use labels to carry on execution .............................................................. 63
Use of Continue (complement of Break) .............................................................................................................. 66
Continue + Label............................................................................................................................................... 67
Mini-Project 3– Java Help System (Help3.java) .................................................................................................... 68
Complete Listing .......................................................................................................................................... 68
Nested Loops ........................................................................................................................................................ 71
Class Fundamentals .............................................................................................................................................. 72
Definition .............................................................................................................................................................. 72
The Vehicle Class .............................................................................................................................................. 72
Using the Vehicle class ................................................................................................................................. 73
Creating more than one instance ................................................................................................................ 73
Creating Objects ................................................................................................................................................... 74
Reference Variables and Assignment ................................................................................................................... 74
Methods ............................................................................................................................................................... 75
Returning from a Method ................................................................................................................................ 76
Returning a Value ............................................................................................................................................. 77
Methods which accept Parameters: ................................................................................................................ 79
Project: Creating a Help class from the Help3.java .......................................................................................... 83
Method helpon( ) ......................................................................................................................................... 83
Method showmenu( ) .................................................................................................................................. 84
Method isvalid( ) .......................................................................................................................................... 85
Class Help ..................................................................................................................................................... 85
Main Program: ............................................................................................................................................. 87
Constructors ......................................................................................................................................................... 88
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Constructor having parameters ....................................................................................................................... 89
Overloading Methods and Constructors .......................................................................................................... 90
Method Overloading .................................................................................................................................... 90
Automatic Type Conversion for Parameters of overloaded Methods ......................................................... 92
Overloading Constructors ............................................................................................................................ 94
Access Specifiers: public and private .................................................................................................................... 96
Arrays and Strings ............................................................................................................................................... 101
Arrays .................................................................................................................................................................. 101
One-dimensional Arrays ................................................................................................................................. 101
Sorting an Array – The Bubble Sort ................................................................................................................ 103
Two-Dimensional Arrays: ............................................................................................................................... 104
Different syntax used to declare arrays: .................................................................................................... 105
Array References:....................................................................................................................................... 106
The Length Variable: .................................................................................................................................. 107
Using Arrays to create a Queue data structure ** .................................................................................... 110
The Enhanced ‘for’ Loop: ........................................................................................................................... 113
Strings ................................................................................................................................................................. 114
Using String Methods ..................................................................................................................................... 115
String Arrays ................................................................................................................................................... 117
Vector and ArrayList ........................................................................................................................................... 122
Employee.java ............................................................................................................................................ 125
ComparableDemo.java .............................................................................................................................. 126
File Operations in Java ........................................................................................................................................ 134
Template to read data from disk .................................................................................................................... 138
Template to write (save) data to disk ............................................................................................................ 142
Introduction to GUI using AWT/Swing ............................................................................................................... 143
Using Swing to create a small Window............................................................................................................... 143
Inserting Text inside Window ......................................................................................................................... 144
Creating a simple application implementing JButton, JTextfield and JLabel ................................................. 145
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