hackjutsu

public class ComputerFacade {
  static private final long BOOT_ADDRESS = 0;
  static private final long BOOT_SECTOR = 0;
  static private final int SECTOR_SIZE = 0;

  private CPU processor;
  private Memory ram;
  private HardDrive hd;

  public ComputerFacade() {

hackjutsu

public class Memory {
  public void load(long position, byte[] data) {
    System.out.println("Memory: loading... " );
  }
}

hackjutsu

public class HardDrive {
  public byte[] read(long lba, int size) {
    System.out.println("HardDrive: reading...");
    return null;
  }
}

hackjutsu

class CPU {
  public void freeze() {
    System.out.println("CPU: freezing...");
  }
  public void jump(long position) {
    System.out.println("CPU: jumping...");
  }
  public void execute() {
    System.out.println("CPU: executing...");
  }

hackjutsu

public interface Command {
  void execute();
}

public class ClientMain {
  static public void main(String[] args) {
    ReceiverA receiverA = new ReceiverA();
    ReceiverB receiverB = new ReceiverB();
    
    Invoker invoker = new Invoker();

hackjutsu

public class Client {
  static public void main(String[] args) {
    CommandA commandA = new CommandA(new ReceiverA());
    CommandB commandB = new CommandB(new ReceiverB());
    
    Invoker invoker = new Invoker();
    invoker.setCommand(0, commandA);
    invoker.setCommand(1, commandB);
    
    invoker.onButtonWasPushed(0);

hackjutsu

public class Invoker {
  private Command[] commands;
  private Command undoCommand;

  public Invoker() {
    commands = new Command[2];
    undoCommand = new NoCommand();
  }
  
  public void setCommand(int slot, Command command) {

hackjutsu

public class NoCommand implements Command {
  @Override
  public void execute() {
    System.out.println("No Command!");
  }

  @Override
  public void undo() {
    System.out.println("No Command!");
  }

hackjutsu

public class CommandB implements Command {
  public CommandB(ReceiverB receiverB) {
    this.receiverB = receiverB;
  }
  
  @Override
  public void execute() {
    receiverB.doAction();
  }
  

hackjutsu

public class CommandA implements Command {
  public CommandA(ReceiverA receiverA) {
    this.receiverA = receiverA;
  }

  @Override
  public void execute() {
    receiverA.doAction();
  }