hackjutsu

public class ClientDemo {
  public static void main(String[] args) {
    MP3PlayerContext mp3Player = new MP3PlayerContext();
    mp3Player.press();
    mp3Player.getState();
    mp3Player.press();
    mp3Player.getState();
  }
}

hackjutsu

public class PlayingState implements State {
  public void pressPlay(MP3PlayerContext context) {
    context.setState(new StandbyState());
  }
  
  @Override
  public String getState() {
    return "Playing...";
  }
}

hackjutsu

public interface State {
  void pressPlay(MP3PlayerContext context);
  String getState();
}

hackjutsu

public class MP3PlayerContext {
  private State state;
  
  public MP3PlayerContext() {
    this.state = new StandbyState();
  }
  
  public void press() {
    state.pressPlay(this);
  }

hackjutsu

public class StreetMap {
  private final Point origin;
  private final Point destination;
  private final Color waterColor;
  private final Color landColor;
  private final Color highTrafficColor;
  private final Color mediumTrafficColor;
  private final Color lowTrafficColor;

  public static class Builder {

hackjutsu

public class ProxyPatternDemo {
  public static void main(String[] args) {
    Image image = new ProxyImage("test_10mb.jpg");
    image.display();
    System.out.println("");
    image.display();
  }
}

hackjutsu

public class ProxyImage implements Image{
  private RealImage realImage;
  private String fileName;
  
  public ProxyImage(String fileName){
    this.fileName = fileName;
  }
  
  @Override
  public void display() {

hackjutsu

public class RealImage implements Image {
  private String fileName;
  
  public RealImage(String fileName){
    this.fileName = fileName;
    loadFromDisk(fileName);
  }
  
  @Override
  public void display() {

hackjutsu

public interface Image {
  void display();
}

hackjutsu

public class ClientMain {
  public static void main(String[] args) {
    ComputerFacade computer = new ComputerFacade();
    computer.start();
  }
}