英文:
How to access Corresponding Inner List Item while using Streams
问题
这是我给您翻译好的内容：
public static void main(String[] args) {String json = "您的 JSON 数据"; // 这里是您的 JSON 数据，由于长度较长，我无法直接显示，您可以将原始 JSON 数据放在这里。Gson gson = new Gson();Root empResp = gson.fromJson(json, Root.class);Optional.ofNullable(empResp).map(Root::getEmployees).map(Employees::getEmp).orElseGet(Collections::emptyList).stream().forEach(emp -> {int empId = emp.getEmpidid();String empName = emp.getEmpname();List<Dept> departments = emp.getDepartments().getDept();for (Dept dept : departments) {String deptCode = dept.getCode();// 在这里使用 empId, empName, deptCode 做相应处理}});}
请注意，由于您的 JSON 数据较长，我无法在单个回答中显示完整的 JSON 数据和完整的类结构，因此我在上述代码中将 JSON 数据的部分用 "您的 JSON 数据" 来代替。请确保您将实际的 JSON 数据和类结构替换到相应的位置。
此代码演示了如何在循环 emp 列表时访问相应的部门代码（dept code）。在循环 emp 列表的过程中，我们首先获取每个 emp 对象的 ID、姓名和部门列表，然后再在部门列表中循环以获取部门代码。您可以在标有注释的部分执行您需要的操作。
英文:
I have the following JSON Structure
{"employees": {"emp": [{"departments": {"dept": [{"code": "S","description": "FieldWork"}]},"empidid": 35,"empname": "Mark"}]}}
Each emp is a List which has corresponding dept List
While looping emp as a List , i need corresponding Dept Code also
I am facing trouble getting the corresponding dept code while looping
public static void main(String[] args) {String json = "{\r\n" +" \"employees\": {\r\n" +" \"emp\": [{\r\n" +" \"departments\": {\r\n" +" \"dept\": [{\r\n" +" \"code\": \"S\",\r\n" +" \"description\": \"FieldWork\"\r\n" +" }]\r\n" +" },\r\n" +" \"empidid\": 35,\r\n" +" \"empname\": \"Mark\"\r\n" +" }\r\n" +"\r\n" +" ]\r\n" +" }\r\n" +"}";Gson gson = new Gson();RootVal empResp = gson.fromJson(json, RootVal.class);Optional.ofNullable(empResp).map(e -> e.getEmployees()).map(e -> e.getEmp()).orElseGet(Collections::emptyList).stream().map(emp -> {emp.getEmpidid();emp.getEmpidid();// How to get DEPT Code Herereturn null;}).collect(Collectors.toList());}
This is my class Structure
==================================public class Dept{private String code;private String description;public void setCode(String code){this.code = code;}public String getCode(){return this.code;}public void setDescription(String description){this.description = description;}public String getDescription(){return this.description;}}==================================import java.util.ArrayList;import java.util.List;public class Departments{private List<Dept> dept;public void setDept(List<Dept> dept){this.dept = dept;}public List<Dept> getDept(){return this.dept;}}==================================public class Emp{private Departments departments;private int empidid;private String empname;public void setDepartments(Departments departments){this.departments = departments;}public Departments getDepartments(){return this.departments;}public void setEmpidid(int empidid){this.empidid = empidid;}public int getEmpidid(){return this.empidid;}public void setEmpname(String empname){this.empname = empname;}public String getEmpname(){return this.empname;}}==================================import java.util.ArrayList;import java.util.List;public class Employees{private List<Emp> emp;public void setEmp(List<Emp> emp){this.emp = emp;}public List<Emp> getEmp(){return this.emp;}}==================================public class Root{private Employees employees;public void setEmployees(Employees employees){this.employees = employees;}public Employees getEmployees(){return this.employees;}}
Please let me how to access Corresponding Dept Code while looping emp List
答案1
得分: 2
你可以使用 Emp 类的字段获取方法，类似这样：
emp -> emp.getDepartments().getDept()
在这里，getDept() 返回 List<Dept>，所以要获取 code，你可以对列表中的每个 Dept 对象使用获取方法，例如 .get(0).getCode()，以获取 Dept 列表中第一个元素的 code。
完整代码：
Optional.ofNullable(empResp).map(e -> e.getEmployees()).map(e -> e.getEmp()).orElseGet(Collections::emptyList).stream().map(emp -> {emp.getEmpidid();emp.getEmpidid();// 在这里如何获取 DEPT Codeemp.getDepartments().getDept().get(0).getCode();return null;}).collect(Collectors.toList());
英文:
You can use the field's getter method of Emp class and so on like
emp -> emp.getDepartments().getDept()
Here, getDept() return List<Dept> so to get code, you can use getter for each Dept object of list. Like .get(0).getCode() to get first element's code of Dept list.
Full code:
Optional.ofNullable(empResp).map(e -> e.getEmployees()).map(e -> e.getEmp()).orElseGet(Collections::emptyList).stream().map(emp -> {emp.getEmpidid();emp.getEmpidid();// How to get DEPT Code Hereemp.getDepartments().getDept().get(0).getCode();return null;}).collect(Collectors.toList());
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