Create JSON String using GSON

Question

I am having a class like following,

public class Student {
    public int id;
    public String name;
    public int age;    
}

Now I want to c

Answer 1

You have two options.

• Use Java's transient keyword which is to indicate that a field should not be serialized. Gson will exclude it automatically. This may not work for you as you want it conditionally.

• Use @Expose annotation for the fields that you want and initialize your Gson builder as following:

  Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();

So you need to mark name and age fields using @Expose and you need to have two different Gson instances for the default one which includes all fields and the one above which excludes fields without @Expose annotation.