how to add multiple filter condition in Java stream filter chain
import java.util.ArrayList; import java.util.List; import java.util.function.Predicate; import java.util.stream.Collectors; public class Main { public static void main(String[] args) { List<Employee> employeeList = getEmployeesFromDataSource(); //filter 1 Predicate<Employee> isEmployeeActive = e -> e.getStatus() == EmployeeStatus.ACTIVE; //filter2 Predicate<Employee> isAccountActive = e -> e.getAccount().getStatus() == AccountStatus.ACTIVE; //Active employees String result = employeeList.stream() .filter(isEmployeeActive) .map(e -> e.getId().toString()) .collect(Collectors.joining(",", "[", "]")); System.out.println("Active employees = " + result); //Active employees with active accounts result = employeeList.stream() .filter(isEmployeeActive.and(isAccountActive)) .map(e -> e.getId().toString()) .collect(Collectors.joining(",", "[", "]")); System.out.println("Active employees with active accounts = " + result); //Active employees with inactive accounts result = employeeList.stream() .filter(isEmployeeActive.and(isAccountActive.negate())) .map(e -> e.getId().toString()) .collect(Collectors.joining(",", "[", "]")); System.out.println("Active employees with inactive accounts = " + result); //Inactive employees with inactive accounts result = employeeList.stream() .filter(isEmployeeActive.negate().and(isAccountActive.negate())) .map(e -> e.getId().toString()) .collect(Collectors.joining(",", "[", "]")); System.out.println("Inactive employees with inactive accounts = " + result); } private static List<Employee> getEmployeesFromDataSource() { List<Employee> employeeList = new ArrayList<>(); employeeList.add(new Employee(1L, "A", "AA", EmployeeStatus.ACTIVE, new Account(1001L, "Saving - 1001", "Saving", AccountStatus.ACTIVE))); employeeList.add(new Employee(2L, "B", "BB", EmployeeStatus.ACTIVE, new Account(1002L, "Checking - 1002", "Checking", AccountStatus.ACTIVE))); employeeList.add(new Employee(3L, "C", "CC", EmployeeStatus.ACTIVE, new Account(1003L, "Deposit - 1003", "Deposit", AccountStatus.ACTIVE))); employeeList.add(new Employee(4L, "D", "DD", EmployeeStatus.ACTIVE, new Account(1004L, "Saving - 1004", "Saving", AccountStatus.INACTIVE))); employeeList.add(new Employee(5L, "E", "EE", EmployeeStatus.ACTIVE, new Account(1005L, "Checking - 1005", "Checking", AccountStatus.INACTIVE))); employeeList.add(new Employee(6L, "F", "FF", EmployeeStatus.ACTIVE, new Account(1006L, "Deposit - 1006", "Deposit", AccountStatus.BLOCKED))); return employeeList; } }
