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 Here
return 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 Code
emp.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 Here
emp.getDepartments().getDept().get(0).getCode();
return null;
}).collect(Collectors.toList());
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