[medium snippets] #medium #designPattern #StatePattern

PlayingState.java

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

StandbyState.java

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