City是一个普通的pojo

public class TestClass {

  public static void main(String[] args) {
    City city = new City();
        Class c1 = City.class;
        Class c2 = city.getClass();
        Class c3 = null;
        try {
      c3 = Class.forName("com.example.demo.entity.City");
    } catch (ClassNotFoundException e) {
      e.printStackTrace();
    }
        System.out.println(c1);
        System.out.println(c2);
        System.out.println(c3);

  }

结果:

class com.example.demo.entity.City

class com.example.demo.entity.City

class com.example.demo.entity.City