private GraphQLOutputType userType;

private void initOutputType() {
   /**
    * 会员对象结构
    */
   userType = newObject()
       .name("User")
       .field(newFieldDefinition().name("id").type(GraphQLInt).build())
       .field(newFieldDefinition().name("age").type(GraphQLInt).build())
       .field(newFieldDefinition().name("sex").type(GraphQLInt).build())
       .field(newFieldDefinition().name("name").type(GraphQLString).build())
       .field(newFieldDefinition().name("pic").type(GraphQLString).build())
       .build();
}

 /**
   * 查询单个用户信息
   * @return
   */
  private GraphQLFieldDefinition createUserField() {
    return GraphQLFieldDefinition.newFieldDefinition()
        .name("user")
        .argument(newArgument().name("id").type(GraphQLInt).build())
        .type(userType)
        .dataFetcher(environment -> {
          // 获取查询参数
          int id = environment.getArgument("id");

          // 执行查询, 这里随便用一些测试数据来说明问题
          User user = new User();
          user.setId(id);
          user.setAge(id + 15);
          user.setSex(id % 2);
          user.setName("Name_" + id);
          user.setPic("pic_" + id + ".jpg");
          return user;
        })
        .build();
  }

  /**
   * 查询多个会员信息
   * @return
   */
  private GraphQLFieldDefinition createUsersField() {
    return GraphQLFieldDefinition.newFieldDefinition()
        .name("users")
        .argument(newArgument().name("page").type(GraphQLInt).build())
        .argument(newArgument().name("size").type(GraphQLInt).build())
        .argument(newArgument().name("name").type(GraphQLString).build())
        .type(new GraphQLList(userType))
        .dataFetcher(environment -> {
          // 获取查询参数
          int page = environment.getArgument("page");
          int size = environment.getArgument("size");
          String name = environment.getArgument("name");

          // 执行查询, 这里随便用一些测试数据来说明问题
          List<User> list = new ArrayList<>(size);
          for (int i = 0; i < size; i++) {
            User user = new User();
            user.setId(i);
            user.setAge(i + 15);
            user.setSex(i % 2);
            user.setName(name + "_" + page + "_" + i);
            user.setPic("pic_" + i + ".jpg");
            list.add(user);
          }
          return list;
        })
        .build();
  }

 private GraphQLSchema schema;

  public GraphSchema() {
    initOutputType();
    schema = GraphQLSchema.newSchema().query(newObject()
        .name("GraphQuery")
        .field(createUsersField())
        .field(createUserField())
        .build()).build();
  }

public class User {
  private int id;
  private int age;
  private int sex;
  private String name;
  private String pic;
  // getter, setter...
}  

public static void main(String[] args) {
    GraphQLSchema schema = new GraphSchema().getSchema();

    String query1 = "{users(page:2,size:5,name:\"john\") {id,sex,name,pic}}";
    String query2 = "{user(id:6) {id,sex,name,pic}}";
    String query3 = "{user(id:6) {id,sex,name,pic},users(page:2,size:5,name:\"john\") {id,sex,name,pic}}";

    Map<String, Object> result1 = (Map<String, Object>) new GraphQL(schema).execute(query1).getData();
    Map<String, Object> result2 = (Map<String, Object>) new GraphQL(schema).execute(query2).getData();
    Map<String, Object> result3 = (Map<String, Object>) new GraphQL(schema).execute(query3).getData();

    // 查询用户列表
    System.out.println(result1);
    // 查询单个用户
    System.out.println(result2);
    // 单个用户、跟用户列表一起查
    System.out.println(result3);

}

{users=[{id=0, sex=0, name=john_2_0, pic=pic_0.jpg}, {id=1, sex=1, name=john_2_1, pic=pic_1.jpg}, {id=2, sex=0, name=john_2_2, pic=pic_2.jpg}, {id=3, sex=1, name=john_2_3, pic=pic_3.jpg}, {id=4, sex=0, name=john_2_4, pic=pic_4.jpg}]}
{user={id=6, sex=0, name=Name_6, pic=pic_6.jpg}}
{user={id=6, sex=0, name=Name_6, pic=pic_6.jpg}, users=[{id=0, sex=0, name=john_2_0, pic=pic_0.jpg}, {id=1, sex=1, name=john_2_1, pic=pic_1.jpg}, {id=2, sex=0, name=john_2_2, pic=pic_2.jpg}, {id=3, sex=1, name=john_2_3, pic=pic_3.jpg}, {id=4, sex=0, name=john_2_4, pic=pic_4.jpg}]}

<dependency>
  <groupId>com.graphql-java</groupId>
  <artifactId>graphql-java</artifactId>
  <version>2.0.0</version>
</dependency>

{
  id=6, 
  sex=0, 
  name="Name_6", 
  pic="pic_6.jpg"
}

{
  id,
  sex,
  name,
  pic
}