[Tutorial] Creating a Basic Hacked Client

public abstract class mod {
...
public int keybind;
}

public class KeybindChanger {
...
public void changeKeybind(Key key) {
Mod.keybind = key.getId();
}
}

package com.godshawk.colony.core;

import java****.BufferedReader;
import java****.BufferedWriter;
import java****.File;
import java****.FileInputStream;
import java****.FileNotFoundException;
import java****.FileWriter;
import java********Exception;
import java****.InputStream;
import java****.InputStreamReader;
import java.nio.charset.Charset;

import org.lwjgl.input.Keyboard;

import com.godshawk.colony.mods.Mod;

public class KeyManager {
	
	public File keybindsFile;
	
	public KeyManager( ) {
		keybindsFile = new File( Colony.instance.minecraft.mcDataDir, "/colony/keybinds.colony" );
		if ( !keybindsFile.exists( ) ) {
			try {
				// Create file
				keybindsFile.getParentFile( ).mkdirs( );
				keybindsFile.createNewFile( );
				FileWriter fstream = new FileWriter( keybindsFile );
				BufferedWriter out = new BufferedWriter( fstream );
				// Hardcoded: Just to be sure we get the initial stuff good.
				// This will, ideally, only be used once.
				out.write( "FULLBRIGHT=" + Keyboard.KEY_F + "\r\n" );
				out.write( "TRACER=" + Keyboard.KEY_M + "\r\n" );
				out.write( "AUTOFISH=" + null + "\r\n" );
				out.write( "NUKER=" + Keyboard.KEY_L + "\r\n" );
				out.write( "KILLAURA=" + Keyboard.KEY_P + "\r\n" );
				out.write( "SPRINT=" + Keyboard.KEY_K + "\r\n" );
				out.write( "CHESTESP=" + Keyboard.KEY_C + "\r\n" );
				out.write( "FASTPLACE=" + Keyboard.KEY_N + "\r\n" );
				out.write( "WATERWALK=" + null + "\r\n" );
				out.write( "XRAY=" + Keyboard.KEY_X + "\r\n" );
				out.write( "FLY=" + Keyboard.KEY_J + "\r\n" );
				out.write( "NOFALL=" + Keyboard.KEY_O + "\r\n" );
				out.write( "PLAYERESP=" + Keyboard.KEY_R + "\r\n" );
				
				// Close the output stream
				out.close( );
			} catch ( Exception e ) { // Catch exception if any
				System.err.println( "Error writing keybinds!: " + e.getMessage( ) );
			}
			readKeysAndBind( );
		} else {
			readKeysAndBind( );
		}
	}
	
	public void readKeysAndBind( ) {
		// Initialize variables
		int binding;
		String str = "";
		String name;
		
		InputStream fis = null;
		BufferedReader br;
		String line;
		
		// Try to create FIS
		try {
			fis = new FileInputStream( keybindsFile );
		} catch ( FileNotFoundException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace( );
		}
		// Create BR
		br = new BufferedReader( new InputStreamReader( fis, Charset.forName( "UTF-8" ) ) );
		
		// Don't forget to catch exceptions!
		try {
			while ( ( line = br.readLine( ) ) != null ) {
				// Deal with the line
				// Get the name and keybind number
				str = line.replaceAll( "[^\\d.]", "" );
				name = line.replaceAll( "[\\d.]", "" );
				binding = 0;
				if ( !str.equals( "" ) ) {
					binding = Integer.parseInt( str );
				}
				name = name.replace( "=", "" );
				// Ton of debug stuff gets printed for catching errors
				System.out.println( "binding==" + binding );
				for ( Mod m : Colony.instance.mmanager.mods ) {
					System.out.println( "Attempting to bind: " + m.name );
					System.out.println( "m.name==" + m.name + "|||" + "name==" + name );
					if ( name.equalsIgnoreCase( m.name ) || m.name.equalsIgnoreCase( name ) ) {
						if ( binding != 0 ) {
							m.keyBind = binding;
							System.out.println( "Mod " + m.name + " bound to key ID " + binding + "!" );
							break;
						} else {
							System.err.println( "WARNING: NULL BINDING FOUND!" );
						}
					} else {
						System.err.println( "FAILED TO BIND " + m.name + " AS " + name );
					}
				}
			}
		} catch ( IOException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace( );
		}
	}
	
	public void writeNewKeybinds( ) {
		try {
			FileWriter fstream = new FileWriter( keybindsFile );
			BufferedWriter out = new BufferedWriter( fstream );
			
			// OOPish
			for ( Mod m : Colony.instance.mmanager.mods ) {
				out.write( m.name + "=" + m.keyBind + "\r\n" );
			}
			
			// Close the output stream
			out.close( );
		} catch ( Exception e ) {
			System.err.println( "ERROR WHILE WRITING KEYBINDS: " );
			e.printStackTrace( );
		}
	}
}

package com.godshawk.colony.console;

import org.lwjgl.input.Keyboard;

import com.godshawk.colony.core.Colony;
import com.godshawk.colony.mods.Mod;
import com.godshawk.colony.util.ChatColour;

public class Bind implements BaseCommand {
	
	private final String name;
	
	public Bind( ) {
		this.name = "bind";
	}
	
 @override
	public void onRun( String[ ] cmd ) {
		// TODO Auto-generated method stub
		try {
			if ( cmd.length == 1 ) {
				throw new NullPointerException( );
			}
			if ( cmd.length == 2 ) {
				Mod m = Colony.mmanager.getHackByName( cmd [ 1 ] );
				m.keyBind = Integer.parseInt( null );
				ConsoleHelper.addMessage( ChatColour.AQUA + m.name + " unbound!" );
			}
			if ( cmd.length == 3 ) {
				Mod m = Colony.mmanager.getHackByName( cmd [ 1 ] );
				m.keyBind = Keyboard.getKeyIndex( cmd [ 2 ].toUpperCase( ) );
				ConsoleHelper.addMessage( ChatColour.AQUA + m.name + " bound to " + cmd [ 2 ] + "!" );
			}
		} catch ( Exception e ) {
			showHelp( );
		}
	}
	
 @override
	public String getName( ) {
		// TODO Auto-generated method stub
		return this.name;
	}
	
 @override
	public void showHelp( ) {
		// TODO Auto-generated method stub
		ConsoleHelper.addMessage( ChatColour.RED + "Usage: " + ChatColour.AQUA + this.getName( ) + " <hack> <key>" );
	}
	
}