使用GSON的空字段的默认值 [英] Default value for null fields using GSON

问题描述

我想为模型上的某些字段设置默认值，因此，如果在反序列化期间我的json缺少字段，则将使用这些默认值。
我想了解的是这样做的最佳实践，以及原因。
我应该在模型的设置器中添加null控件，我应该使用try catch查找任何情况，我应该扩展和修改typeAdapter（此解决方案对我来说似乎很冗长，让我知道我是否是错的）还是有更好的解决方案？

I would like to set default values for some fields on my model, so if during deserialization my json has missing fields, those default values are used. What I would like to understand which is the best practice to do this, and why. I should add the control of null in the setters of my model, I should use the try catch to find any cases, I should extend and modify typeAdapter (this solution seems very verbose to me, let me know if I'm wrong) or there is a even better solution?

推荐答案

如果这些内容根本无法在JSON数据中使用，

If those won't be available be in JSON data at all, then just initiate the variables.

private int id = -1;
private String name = "User not available";

如果有可能得到 null 值，然后在吸气剂中检查

If there is a probability that you might get null values, then check for it in getters

private String DEFAULT_NAME = "User not available";

private String name;

public String getName(){
  if(null == name) return DEFAULT_NAME;
  return name; 
}

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