Intro to JAVA

1
Intro to JAVA

• Structured vs. Object-oriented programming
• Glade/CCB programming environment
• Hello, World!
• Turning ideas into computer programs
• Structured programming in JAVA

2
Types of Languages

• Machine code
• Assembly language
• High-level languages
• Unstructured languages
• Structured languages
• Object-oriented languages

3
Structured vs. Object-oriented

• Structured programming is process centric
• Object-oriented programming is data centric
• Both compile to the same Assembly

4
Mental Models

• Claim old fashioned structured programmers are
  hard to convert to object-oriented model
• Counter object-oriented programmers take longer
  to learn algorithms

5
JAVA Basics

• Pure object-oriented language
• Structured programming concepts must be embedded
  into objects

6
Writing Programs

• Programs are developed in text editors
• Program files are sent to a compiler
• Compilers produce executable files
• (JAVA produces bytecode)

7
Programming in Glade/CCB

• Windows-based PCs
• Notepad as text editor
• DOS command line compiler
• DOS command line execution

8
Hello, World!

• import york.
• public class Hello
• public static void main( String args )
• York.println( Hello, World! )

9
Compilation and Execution

• save file as Hello.java
• compile file with javac Hello.java
• execute file with java Hello

10
Thought to Finish

• Define the problem
• Develop an algorithm to solve the problem
• Express the algorithm in programming constructs
• Convert the program into the required syntax
• Write the program into a text editor
• Compile the program into Assembly/machine code
• Execute the machine code on the computer

11
Structured programming in JAVA

• import ltpackagesgt.
• public class ltprogram namegt
• public static void main( String args )
• ltstructured programgt

12
Things to Notice
13
What we will do in this course

• Two programming assignments
• one easy, one appropriate
• Some code interpretation (final exam)
• Will skip many details (and end short)

14
Summary

• Dont lose concepts in the details
• Structured programming has only three concepts
• The details will change!