循环遍历一个对象并从它的所有变量中获取值

Question

我正在使用 Gson 将一组 JSON 对象解析为 POJO。然后我使用 afor-loop将每个解析的对象发送到一个方法进行处理。我似乎无法找到一种方法来遍历单个对象并获取其中包含的值。例如：private Double thing1;private Double thing2;private Dboule thing3;private void doSomething(MyObject myObj){ ...myObject contains thing1, thing2, thing3 which are each doubles.//I want to loop through the entire object, //grab thing1's value and do something with it, then grab thing2's value.. etc.  }这很容易做到吗？我已经尝试了一段时间，但似乎无法让它发挥作用。我可以通过使用以下方法轻松地单独抓住它们：myObj.thing1但它需要在循环中完成，因为有大量的值进来。更新：这几乎可以工作，但它打印整个对象，然后打印单个对象值。我怎样才能让它只打印单个值而不先打印所有内容？for(Field field : data.getClass().getDeclaredFields()){    Object value = field.get(data);    System.out.println(value);        }输出：    [{"accel_1":0.012,"accel_2":0.125,"accel_3":0.03,"accel_4":0.012,"accel_5":0.125,"accel_6":0.03,"accel_7":0.012,"accel_8":0.125,"accel_9":0.03,"accel_10":0.012,"accel_11":0.125,"accel_12":0.03},{"accel_1":0.18,"accel_2":0.26,"accel_3":0.05,"accel_4":0.18,"accel_5":0.26,"accel_6":0.05,"accel_7":0.18,"accel_8":0.26,"accel_9":0.05,"accel_10":0.18,"accel_11":0.26,"accel_12":0.05},{"accel_1":0.06,"accel_2":0.02,"accel_3":0.03,"accel_4":0.06,"accel_5":0.02,"accel_6":0.03,"accel_7":0.06,"accel_8":0.02,"accel_9":0.03,"accel_10":0.06,"accel_11":0.02,"accel_12":0.03}]0.0120.1250.030.0120.1250.030.0120.1250.030.0120.1250.03[{"accel_1":0.012,"accel_2":0.125,"accel_3":0.03,"accel_4":0.012,"accel_5":0.125,"accel_6":0.03,"accel_7":0.012,"accel_8":0.125,"accel_9":0.03,"accel_10":0.012,"accel_11":0.125,"accel_12":0.03},{"accel_1":0.18,"accel_2":0.26,"accel_3":0.05,"accel_4":0.18,"accel_5":0.26,"accel_6":0.05,"accel_7":0.18,"accel_8":0.26,"accel_9":0.05,"accel_10":0.18,"accel_11":0.26,"accel_12":0.05},{"accel_1":0.06,"accel_2":0.02,"accel_3":0.03,"accel_4":0.06,"accel_5":0.02,"accel_6":0.03,"accel_7":0.06,"accel_8":0.02,"accel_9":0.03,"accel_10":0.06,"accel_11":0.02,"accel_12":0.03}]0.180.260.050.180.260.050.180.260.050.180.260.050.060.020.030.060.020.030.060.020.030.060.020.03

Answer 1

您可以使用反射来做到这一点：

Field[] fields = games.getClass().getDeclaredFields();

for(Field field: fields) {

    //do stuff

}

getDeclaredFields()：

返回一个 Field 对象数组，这些对象反映了由此 Class 对象表示的类或接口声明的所有字段。这包括公共、受保护、默认（包）访问和私有字段，但不包括继承的字段。

Answer 2

如果我理解正确，您正在尝试遍历对象的值。如果是这种情况，请按如下方式编写您的方法：

private void doSomething(MyObject myObj)

{

    Double sum_of_values = 0;

    for (MyObject val : myObj) // "val" will be each Double value within the object.

    { 

        //I don't know what you want to do with the values of your object,

        //but below is an example of getting the sum of values within your object:

        sum_of_values += val; 

        //here I assumed that are values are Double, which in many cases they can be of any type.

        //Or you can send each value to another method and do your stuff there:

        someMethod(val);

        //Or maybe do something else.

    }

}

private void someMethod(Double val)

{

    //do things here.

{

我希望这能给你一个想法