使用子类的值过滤类的流 [英] Filter a stream of a class using a value of subclass
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问题描述
我有一个父类Company
,它有一个Employee
对象的列表.我需要创建一个Parent
类的流,该流具有一个Employee
并提到了电话号码.
I have a parent class Company
which has a list of Employee
objects. I need to create a stream of Parent
class who has an Employee
with the phone number mentioned.
Company cmp1 = new Company();
cmp1.setName("oracle");
Company cmp2 = new Company();
cmp1.setName("Google");
Employee emp1 = new Employee();
emp1.setName("David");
emp1.setPhone("900");
Employee emp2 = new Employee();
emp2.setName("George");
emp2.setPhone("800");
Employee emp4 = new Employee();
emp4.setName("BOB");
emp4.setPhone("300");
Employee emp5 = new Employee();
emp5.setName("taylor");
emp5.setPhone("900");
List<Employee> cmp1EmpList1 = new ArrayList<Employee>();
cmp1EmpList1.add(emp1);
cmp1EmpList1.add(emp2);
cmp1.setEmployees(cmp1EmpList1);
List<Employee> cmp1EmpList2 = new ArrayList<Employee>();
cmp1EmpList2.add(emp4);
cmp1EmpList2.add(emp5);
cmp2.setEmployees(cmp1EmpList2);
List<Company> companies = Arrays.asList(cmp1, cmp2);
要检索流,我尝试添加以下代码
To retrieve the stream I have tried adding the below code
List<Company> companiesWithEmployeesphone800 = companies.stream()
.filter(loc -> loc.getEmployees()
.stream()
.flatMap(locnew -> locnew.getPhone()
.equalsIgnoreCase("800"))
)
.collect(Collectors.toList());
但是收到了不兼容的类型.
but received incompatible types.
推荐答案
将anyMatch
用作谓词而不是flatMap
作为
List<Company> companiesWithEmployeesphone800 =
companies.stream()
.filter(loc -> loc.getEmployees().stream()
.anyMatch(locnew -> locnew.getPhone().equalsIgnoreCase("800")))
.collect(Collectors.toList());
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