Download Source Code

The (5) Parts Every Computer MUST have
Input Devices (getting information IN)
Humans
Computers
Question: What other INPUT devices can you think of?
Output Devices (getting information OUT)
Humans
Computers
Question: What other OUTPUT devices can you think of?
Input and Output Devices
Married Humans
He is inputting
She is outputting
Memory Devices (storing information)
Computers
Humans
Long term
Short term
CPU Devices (logic and calculator)
Humans
Computers
Bus (transfer of information/data)
Humans
Computers
Question: how do you think information travels in humans? In Computers?
Alan Turing & Von Neumann
1) Input
2) Output
3) Memory
4) CPU
5) Bus
• Alan Turing thought of (created the theory) a machine that would run a stored program
• Von Neumann’s design defined/said: “All digital computers have the same (5) parts “
Programming Concepts
We don’t all speak the same language
English
“I like to feed my dog
named Sir Barfs–A-Lot
chocolate pretzels.
Spanish
Me gusta comer a mi perro
llamado Barfs-A-Lot
mucho chocolate pretzels.
Humans and computers don’t either
Java
System.out.println("Hello
World!");
Binary
0011001001110001010100
0110100010111001010010
Humans Understand Source Code
A=5
B=6
C= A + B
Question: Can you guess what the Java code above does?
CPUs Understand Machine Code
Binary
0011001001110001010100
0110100010111001010010
Question: Can you guess what the machine code above does?
So we use translators (Compilers)
Machine Code is computer readable
Source Code is human readable
Java
Development Kit
Virtual Machine
System.out.println("Hello World!");
0011001001110001010100
0110100010111001010010
Java code is translated twice!
Source Code is human readable
System.out.println("Hello
World!");
Java code is translated twice!
Source Code is human readable
System.out.println("Hello
World!");
STEP #1: The JDK
compiles source
code into Java
byte code
Development Kit
Byte Code is an in between state
mov eax, byte [ebp-4]
mov edx, byte [ebp-8]
add eax, edx
mov ecx, eax
Java code is translated twice!
Source Code is human readable
System.out.println("Hello
World!");
STEP #1: The JDK
compiles source
code into Java
byte code
STEP #2: The JVM
translates byte code
into machine code and
runs the machine code
Development Kit
Byte Code is an in between state
mov eax, byte [ebp-4]
mov edx, byte [ebp-8]
add eax, edx
mov ecx, eax
Virtual Machine
Binary Code or machine code is run by the CPU
0011001001110001010100
0110100010111001010010
Modding Concepts
Making Mods (you need source)
Byte Code
mov eax, byte [ebp-4]
mov edx, byte [ebp-8]
add eax, edx
mov ecx, eax
• You only get byte code when you buy the game
• Unfortunately you need source code to make mods
Question: How do you get the source from the Byte code?
De-compiler (reverse translator)
Byte Code
mov eax, byte [ebp-4]
mov edx, byte [ebp-8]
add eax, edx
mov ecx, eax
Source Code
System.out.println("Hello
World!");
Forge takes the byte code you get when
you purchase Minecraft and decompiles it,
and generates Minecraft source code that
you can then modify
MCreator: An easy-to-use mod maker
Generates Source Code for your mod
Generating a new Minecraft version
Source Code for
your mod
Source Code for
Minecraft
Generating a new Minecraft version
Source Code for
your mod
Source Code for
Minecraft
Development
DevelopmentKit
Kit
New version with your Mod
The JDK does the following:
1. Merges the source
2. Creates a new Minecraft
3. Generates the byte code
Generating a new Minecraft version
Source Code for
your mod
Source Code for
Minecraft
Development
DevelopmentKit
Kit
New version with your Mod
The JDK does the following:
1. Merges the source
2. Creates a new Minecraft
3. Generates the byte code
The JVM does the following:
1. Translates byte code into
machine code
2. Runs the Minecraft machine
code
Virtual Machine