Java8流查找多个值并返回布尔值

Question

List<Employee> employees = Arrays.asList(
        new Employee("Sachin Tendulkar", 41),
        new Employee("Sachin Tendulkar", 36),
        new Employee("MS Dhoni", 34),
        new Employee("Rahul Dravid", 40),
        new Employee("Lokesh Rahul", 25),
        new Employee("Sourav Ganguly", 40)
);

boolean isPresent = employees.stream()
            .allMatch(employee -> (equalsIgnoreCase(employee.getName(),"Sachin Tendulkar") && equalsIgnoreCase(employee.getAge(),"36")));

任何暗示都会很明显。

Answer 1

您可以使用anymatch，如下所示：

boolean isPresent = employees.stream()
        .anyMatch(employee ->
                (employee.getName().equalsIgnoreCase("Sachin Tendulkar") && employee.getAge() == 36)
                        ||
                        (employee.getName().equalsIgnoreCase("Rahul Dravid") && employee.getAge() == 40)
        );

要获取员工列表，可以使用：

List<Employee> result = employees.stream()
        .filter(employee ->
                (employee.getName().equalsIgnoreCase("Sachin Tendulkar") && employee.getAge() == 36)
                        ||
                        (employee.getName().equalsIgnoreCase("Rahul Dravid") && employee.getAge() == 40)
        ).collect(Collectors.toList());

或者，您可以创建一个要查找的Employee列表，并使用List::ContainsAll，注意您必须在Employee类中重写HashCode和Equals方法：

List<Employee> listToFind = Arrays.asList(
        new Employee("Sachin Tendulkar", 36),
        new Employee("Rahul Dravid", 40)
);

boolean isPresent = employees.containsAll(listToFind);