Java/com/study/demo4/HomeController.java

package com.study.demo4;

import java.util.ArrayList;
import java.util.List;

class HomeController {
  private List<SmartDevice> devices = new ArrayList<>();

  public void addDevice(SmartDevice device) {
    devices.add(device);
  }

  public String getDeviceStatus(String name) {
    for (SmartDevice device : devices) {
      if (device.getStatus().contains(name)) {
        return device.getStatus();
      }
    }
    return "Device not found";
  }
}