qa8310825 light system with enum

import java.util.*;
// test class
public class QA8310825 {
  public static void main(String[] args) {
    LightSystem system =
        new LightSystem(new Swich("f1"), new Swich("f2"), new Swich("f3"));
    system.showState();
    system.turnSwich1(); system.showState();
    system.turnSwich1(); system.showState();
    system.turnSwich2(); system.showState();
    system.turnSwich3(); system.showState();
    system.turnSwich2(); system.showState();
    system.turnSwich1(); system.showState();
  }
}
class Swich {
  private enum State {
    Left, Right
  }
  private String floor;
  private State state;

  public Swich(String floor) {
    this.floor = floor;
    this.state = State.Left;
  }

  public String getFloor() {
    return this.floor;
  }

  public State getState() {
    return this.state;
  }

  public void toggle() {
    if (this.state == State.Left) {
      this.state = State.Right;
      return;
    }
    this.state = State.Left;
  }

  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append("<Floor:" + this.getFloor());
    sb.append(", " + this.getState().name());
    sb.append(">");
    return sb.toString();
  }
}

class LightSystem {
  private enum Light {
    On, Off
  }
  private Map<Integer, Swich> swiches = new TreeMap<Integer, Swich>();
  private Light lamp;

  public LightSystem(Swich... s) {
    for (int i = 0; i < s.length; i++) {
      int size = this.swiches.size(); // auto increment
      this.swiches.put(size, s[i]);
    }
    this.lamp = Light.Off;
  }

  public Light getLight() {
    return this.lamp;
  }

  public void showState() {
    System.out.println(this);
  }

  public void turn() {
    if (this.lamp == Light.Off) {
      this.lamp = Light.On;
      return;
    }
    this.lamp = Light.Off;
  }

  private Swich find(String name) {
    Swich ret = null;
    for (Swich s : this.swiches.values()) {
      if (s.getFloor().equals(name)) {
        ret = s;
        break;
      }
    }
    return ret;
  }

  private boolean turnSwich(Swich swich) {
    Swich s = this.find(swich.getFloor());
    if (s == null) { return false; }
    s.toggle();
    this.turn();
    return true;
  }

  public void turnSwich1() {
    this.turnSwich(this.swiches.get(0)); // 0 means first inserts
  }

  public void turnSwich2() {
    this.turnSwich(this.swiches.get(1));
  }

  public void turnSwich3() {
    this.turnSwich(this.swiches.get(2));
  }

  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append("Lamp: " + this.getLight().name() + ", swiches: ");
    sb.append(this.swiches.values());
    return sb.toString();
  }
}