安卓。设置无效json字段的默认值

import com.google.gson.Gson;

public class MainActivity extends AppCompatActivity {
    private static final String DEFAULT_VALUE = "N/A";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        String json = "{\"name\":\"John\",\"age\":30}";

        Gson gson = new Gson();
        Person person = gson.fromJson(json, Person.class);

        String name = person.getName() != null ? person.getName() : DEFAULT_VALUE;
        int age = person.getAge() != null ? person.getAge() : 0;

        // 使用设置好的字段值进行后续操作
        // ...
    }

    private static class Person {
        private String name;
        private Integer age;

        public String getName() {
            return name;
        }

        public Integer getAge() {
            return age;
        }
    }
}