1. Review of Previous Lesson
31/05/2019
Review of Previous Lesson
State as many Vocabulary words and Learning Objectives that you remember from the last lesson as you can.
Remember to grade yourself from

2. 31/05/2019
Introduction to Java

3. Vocabulary 31/05/2019 Content: Start End state describe common terms
software
hardware
high level language
machine code
source code
compiler

4. 31/05/2019
Vocabulary
Content:
Start
End
object code
Javac
JVM
JDK

5. Learning Objectives 31/05/2019 Content: Start End
State and describe common java terms.
State what needs to be installed to write, compile and run a Java program.

6. Software Software Hardware Computer instructions or data.
31/05/2019
Software
Computer instructions or data.
Makes a computer do something and are written to run on the hardware.
Hardware
Software

7. e.g. Visual Basic, Java, C, Fortran
31/05/2019
Software
Software is usually written in a high level language which is fairly similar to our own spoken languages.
This makes it easier for us humans to use.
However, computers only understand machine code which is in binary form (1s and 0s).
Hardware
High Level Languages
e.g. Visual Basic, Java, C, Fortran
Machine Code

8. 31/05/2019
Compilers
Translate high level languages (the translator’s source code) into machine code (the translator’s object code) which can be executed by a computer.
Compiler
High Level Languages
Machine Code
Source
Code
Object
Code written in a high level language.
Code in executable form.

9. Java Compiler Javac Compiler Java Program Bytecode .java file
31/05/2019
Java Compiler
Javac Compiler
Java
Program
Bytecode
.java file
.class file

10. Java Virtual Machine (JVM)
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Java Virtual Machine (JVM)
Executes the Java Bytecode (.class file) produced by Javac Compiler.
Each Operating System (OS) e.g. Windows, Mac, Linux etc… has a different JVM to tell the OS what to do in its own machine code language.
This is why we call Java a platform (OS) independent language.
As any OS can execute a Java program as long as it has a Javac Compiler or it has previously been compiled into Java Bytecode and it has a JVM to execute this Java Bytecode.

11. Java Runtime Environment (JRE)
31/05/2019
Java Runtime Environment (JRE)
Includes:
JVM
Browser plugins
Programs written to add extra features to a browser.
Applets support
Java programs written to run on web pages.
When you have JRE installed on your system, you can run a Java program however you wouldn’t be able to compile a Java program.
Needed when you only need to run Java programs on your computer (not compile your own programs).

12. Java Development Kit (JDK)
31/05/2019
Java Development Kit (JDK)
Includes:
JRE
Compilers
Various other tools like JavaDoc, Java debugger etc.
JavaDoc: software documentation generator for Java programmers in HTML format (from Java source code).
Debugger: A program that assists in the detection and correction of errors in computer programs.
In order to create, compile and run Java programs you will need JDK installed on your computer.

13. Install Java You can get the java from here. 31/05/2019
Remember you need to install the JDK.
Recommended: install only the latest version of “8u…”. Later versions (11, 12, ..) are not needed and overcomplicate things for AP CS. Also although it is possible to install multiple versions of JDK/JRE concurrently, it is messy.
If you have previous installations of older version(s) of JDK/JRE, un-install ALL of them.
Search Windows for "Control Panel" ⇒ "Programs" ⇒ "Programs and Features" ⇒ Un- install ALL programs begin with "Java", such as "Java SE Development Kit ...", "Java SE Runtime ...", "Java X Update ...", and etc.
I suggest that you click the back and forward arrows each time you uninstall to make sure you update the installed programs list.
If necessary, read "JDK Installation Common Errors".
For how to proceed on a Mac please see:

14. 31/05/2019
Permanent Java path setup guide - 1st time use only, this only needs to be done once
It is possible to use an IDE like Eclipse to run java programs but I intend to only use a text editor and command prompt.
The Java compiler javac.exe and Java runtime java.exe reside in the "bin" folder of the JDK folder.
So to run JDK programs from the command prompt, it needs to be told to also search this folder for executable programs.
This is done by adding this “bin” folder to what is known as the “Path”.
Please follow the instructions on the next 5 slides to do this.
For how to proceed on a Mac please see:

15. 31/05/2019
Permanent Java path setup guide - 1st time use only, this only needs to be done once
Navigate to the folder which contains the JDK's programs.
Click the yellow folder icon in the address bar.
Copy the address for pasting later.

16. 31/05/2019
Permanent Java path setup guide - 1st time use only, this only needs to be done once
Click Windows for:
environment variables
Click Edit the system environment variables. 2 1
If you are using an older version of Windows or for whatever reason cannot do this, please see the next slide.

17. 31/05/2019
Permanent Java path setup guide - 1st time use only, this only needs to be done once
If you are using an older version of Windows or for whatever reason cannot do the instructions on the previous slide, use the Control Panel (Start Menu - Windows System). 2 3 1

18. 31/05/2019
Permanent Java path setup guide - 1st time use only, this only needs to be done once
If you cannot do slide 16 only.

19. 31/05/2019
Permanent Java path setup guide - 1st time use only, this only needs to be done once
If you cannot do slide 16 only.

20. 31/05/2019
Permanent Java path setup guide - 1st time use only, this only needs to be done once
If you cannot do slide 16 only.

21. 31/05/2019
Permanent Java path setup guide - 1st time use only, this only needs to be done once
If you cannot do slide 16 only.

22. 31/05/2019
Permanent Java path setup guide - 1st time use only, this only needs to be done once
Click Path and Edit.

23. Permanent Java path setup guide - 1st time use only, this only needs to be done once
31/05/2019
Read the following 3* before actually completing as there is no undo!
Do NOT delete "Variable value" field.
Otherwise, some existing applications may not run.
To be SAFE, copy the content of the "Variable value" and paste to somewhere before changing it!!!
Click at the beginning of the existing contents to get a cursor and paste the address that you copied earlier (Ctrl + v), of the “bin” folder, followed by a ;
Click OK * 2 (this & the previous “Environment Variables” windows).
If you don’t see the above, try the next slide.

24. 31/05/2019
Permanent Java path setup guide - 1st time use only, this only needs to be done once
If you didn’t see the screenshot on the previous slide, you should see this one. 1 2
Paste the address that you copied earlier (Ctrl + v), of the “bin” folder.
Click OK * 2 (this & the previous “Environment Variables” windows).

25. 5/31/2019
Grade yourself
Grade yourself on the vocabulary and learning objectives of the presentation.