stream filter with multiple conditions

1import java.util.ArrayList;
2import java.util.List;
3import java.util.function.Predicate;
4import java.util.stream.Collectors;
5 
6public class Main 
7{
8    public static void main(String[] args) 
9    {
10        List<Employee> employeeList = getEmployeesFromDataSource();
11         
12        //filter 1
13        Predicate<Employee> isEmployeeActive = e -> e.getStatus() == EmployeeStatus.ACTIVE;
14 
15        //filter2
16        Predicate<Employee> isAccountActive = e -> e.getAccount().getStatus() == AccountStatus.ACTIVE;
17         
18        //Active employees
19        String result = employeeList.stream()
20                .filter(isEmployeeActive)
21                .map(e -> e.getId().toString())
22                .collect(Collectors.joining(",", "[", "]"));
23         
24        System.out.println("Active employees = " + result);
25         
26        //Active employees with active accounts
27        result = employeeList.stream()
28                .filter(isEmployeeActive.and(isAccountActive))
29                .map(e -> e.getId().toString())
30                .collect(Collectors.joining(",", "[", "]"));
31         
32        System.out.println("Active employees with active accounts = " + result);
33         
34        //Active employees with inactive accounts
35        result = employeeList.stream()
36                .filter(isEmployeeActive.and(isAccountActive.negate()))
37                .map(e -> e.getId().toString())
38                .collect(Collectors.joining(",", "[", "]"));
39         
40        System.out.println("Active employees with inactive accounts = " + result);
41         
42        //Inactive employees with inactive accounts
43        result = employeeList.stream()
44                .filter(isEmployeeActive.negate().and(isAccountActive.negate()))
45                .map(e -> e.getId().toString())
46                .collect(Collectors.joining(",", "[", "]"));
47         
48        System.out.println("Inactive employees with inactive accounts = " + result);
49    }
50     
51    private static List<Employee> getEmployeesFromDataSource() {
52        List<Employee> employeeList = new ArrayList<>();
53         
54        employeeList.add(new Employee(1L, "A", "AA", EmployeeStatus.ACTIVE, 
55                new Account(1001L, "Saving - 1001", "Saving", AccountStatus.ACTIVE)));
56        employeeList.add(new Employee(2L, "B", "BB", EmployeeStatus.ACTIVE, 
57                new Account(1002L, "Checking - 1002", "Checking", AccountStatus.ACTIVE)));
58        employeeList.add(new Employee(3L, "C", "CC", EmployeeStatus.ACTIVE, 
59                new Account(1003L, "Deposit - 1003", "Deposit", AccountStatus.ACTIVE)));
60        employeeList.add(new Employee(4L, "D", "DD", EmployeeStatus.ACTIVE, 
61                new Account(1004L, "Saving - 1004", "Saving", AccountStatus.INACTIVE)));
62        employeeList.add(new Employee(5L, "E", "EE", EmployeeStatus.ACTIVE, 
63                new Account(1005L, "Checking - 1005", "Checking", AccountStatus.INACTIVE)));
64        employeeList.add(new Employee(6L, "F", "FF", EmployeeStatus.ACTIVE, 
65                new Account(1006L, "Deposit - 1006", "Deposit", AccountStatus.BLOCKED)));
66         
67        return employeeList;
68    }
69}
70

1List<Employee> employeeList = getEmployeesFromDataSource();
2Predicate<Employee> isEmployeeActive = e -> e.getStatus() == EmployeeStatus.ACTIVE;
3String result = employeeList.stream()
4                .filter(isEmployeeActive)
5                .map(e -> e.getId().toString())
6                .collect(Collectors.joining(",", "[", "]"));
7         
8        System.out.println("Active employees = " + result);
9