枚举无法解决？Java的

Question

我有2个分类在不同的页面.

对象类:

public class Sensor {

  Type type;
  public static enum Type
  {
        PROX,SONAR,INF,CAMERA,TEMP;
  }

  public Sensor(Type type)
  {
  this.type=type;
  }

  public void TellIt()
  {
      switch(type)
      {
      case PROX: 
          System.out.println("The type of sensor is Proximity");
          break;
      case SONAR: 
          System.out.println("The type of sensor is Sonar");
          break;
      case INF: 
          System.out.println("The type of sensor is Infrared");
          break;
      case CAMERA: 
          System.out.println("The type of sensor is Camera");
          break;
      case TEMP: 
          System.out.println("The type of sensor is Temperature");
          break;
      }
  }

  public static void main(String[] args)
    {
        Sensor sun=new Sensor(Type.CAMERA);
        sun.TellIt();
    }
    }

主要课程:

import Sensor.Type;

public class MainClass {

public static void main(String[] args)
{
    Sensor sun=new Sensor(Type.SONAR);
    sun.TellIt();
}

错误是两个,一个是Type无法解析,另一个是不能导入.我能做什么？我第一次使用枚举,但你看到了.

Answer 1

enums需要在包中import声明语句才能工作,即enums无法从package-private(默认包)类中导入类.将枚举移动到包中

import static my.package.Sensor.Type;
...
Sensor sun = new Sensor(Type.SONAR);

或者,您可以使用完全限定的 enum

Sensor sun = new Sensor(Sensor.Type.SONAR);

没有import语句