Lecture 3 java basics

Introduction to Computer Science II Lecture 3 : Java Essentials (Chapter 1) COSC 1320/6305

Preventive Coding ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],3-

Class Participation NetBeans Projects

Java is Compiled and Interpreted Text Editor Compiler Interpreter Programmer Source Code .java file Byte Code . class file Hardware and Operating System Notepad, emacs,vi javac java appletviewer netscape

Compiled Languages Text Editor Compiler Linker Programmer Source Code .c file Object Code . o file Notepad, emacs,vi gcc Executable Code a.out file

Total Platform Independence JAVA COMPILER JAVA BYTE CODE JAVA INTERPRETER Windows 95 Macintosh Solaris Windows NT (translator) (same for all platforms) (one for each different system)

Architecture Neutral & Portable ,[object Object],[object Object],[object Object]

Architecture Neutral & Portable ,[object Object],[object Object]

Rich Class Environment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Java Development Kit ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Process of Building and Running Java Programs Text Editor Java Source Code javac Java Class File java Outout javadoc javah jdb HTML Files Header Files

How Does Java compares to C++

Overlap of C , C++ , and Java C C++ Java

Compiling a Java Program or Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1-

Running a Java Program ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1-

Assignment Statements With Primitive Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Assignment Statements With Primitive Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Shorthand Assignment Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Shorthand Assignment Statements 1- Copyright © 2010 Pearson Addison-Wesley. All rights reserved. Example: Equivalent To: count += 2; count = count + 2; sum -= discount; sum = sum – discount; bonus *= 2; bonus = bonus * 2; time /= rushFactor; time = time / rushFactor; change %= 100; change = change % 100; amount *= count1 + count2; amount = amount * (count1 + count2);

Precedence and Associativity Rules ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Integer and Floating-Point Division ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

More Details About Type Casting ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

CLASS Participation A ! (pp. 44)

The Class String ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Concatenation of Strings ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Classes, Objects , and Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Classes, Objects , and Methods ,[object Object],[object Object],[object Object],[object Object]

String Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Some Methods in the Class String (Part 1 of 8)

Some Methods in the Class String (Part 2 of 8) 1-

Some Methods in the Class String (Part 5 of 8)

String Processing ,[object Object],[object Object],[object Object],[object Object],[object Object]

Basic Java Constructs and Data Types – Nuts and Bolts Looking into Specific Differences and Enhancements in Java compared to C

Contents ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Hello World ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Hello World: Java and C ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],/* helloworld.c : Hello World program */ #define <stdio.h> void main(int argc, char *argv[]) { printf(“Hello World”); } S1: S2: S3: S4: S6:

Program Processing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Closer Look at - Hello World ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Closer Look at - Hello World ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Java imports java.lang.* by default ,[object Object],[object Object],[object Object],[object Object]

public static void main (String args[]) ,[object Object],[object Object],[object Object]

System.out.println(“Hello World”); ,[object Object],[object Object],[object Object],[object Object]

Java Program Structure Documentation Section Package Statement Import Statements Interface Statements Class Declarations Main Method Class { }

More Java: Classes and static methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Basic Data Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Variables ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Constants ,[object Object],[object Object],[object Object],[object Object],[object Object]

Declaring Constants - example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Control Flow ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Control Flow - Examples

Control Flow - Examples ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Control Flow - Examples

Control Flow - Examples ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Reading from Keyboard ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Keyboard class Usage Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Command Line Arguments ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Printing command line arguments ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],+ concatenates strings or numbers

Execution Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object]

Introduction to Computer Science II COSC 1320/6305 Lecture 3: Console Input and Output (Chapter 2)

printf Format Specifier ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],2- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Right and Left Justification in printf ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],2- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Multiple arguments with printf ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],2- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Line Breaks with printf ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],2- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Legacy Code ,[object Object],[object Object],[object Object],[object Object],2-

Money Formats ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],2- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Specifiying Locale ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],2- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Importing Packages and Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Console Input Using the Scanner Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],2-

Console Input Using the Scanner Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Console Input Using the Scanner Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Console Input Using the Scanner Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Pitfall: Dealing with the Line Terminator, '' ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Pitfall: Dealing with the Line Terminator, '' ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],2- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

CLASS Participation B ! (pp. 88)

Other Input Delimiters ,[object Object],[object Object],[object Object],[object Object],[object Object]

Changing the Input Delimiter (Part 2 of 3)

Introduction to Computer Science II COSC 1320/6305 06.06.2011 Lecture 3: Flow Of Control (Chapter 3)

Branching with an if-else Statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],3- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Compound Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],3- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Omitting the else Part ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],3- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Multiway if-else Statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],. . . 3- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

CLASS Participation C ! (pp. 106)

The switch Statement ,[object Object],[object Object],[object Object],[object Object]

The switch Statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The switch Statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],. . .

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The Conditional Operator 3- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Building Boolean Expressions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],3- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],while Syntax . . . 3- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

do-while Statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],3- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],do-while Syntax . . . 3- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

The Comma in for Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],3- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

Nested Loops ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],3- Copyright © 2010 Pearson Addison-Wesley. All rights reserved.

General Debugging Techniques ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lecture 3 java basics

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