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Java 8 면접 질문과 답변

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You can simply use sort method of list to sort the list of employees.

List<Employee> employeeList = createEmployeeList();

employeeList.sort((e1,e2)->e1.getAge()-e2.getAge());

employeeList.forEach(System.out::println);

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Check the following code:

List<Employee> employeeList = createEmployeeList();

Optional<Employee> e1 = employeeList.stream()

.filter(e->e.getName().equalsIgnoreCase("Mary")).findAny();

if(e1.isPresent())

System.out.println(e1.get());

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Check the following code:

List<Employee> employeeList = createEmployeeList();

OptionalInt max = employeeList.stream().

mapToInt(Employee::getAge).max();

if(max.isPresent())

System.out.println("Maximum age of Employee: "+max.getAsInt());

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Java 8 Stream supports both intermediate and terminal operation.

Intermediate operations are lazy in nature and do not get executed immediately. Terminal operations are not lazy, they are executed as soon as encountered.
Intermediate operation is memorized and is called when terminal operation is called.
All Intermediate operations return stream as it just transforms stream into another and terminal operation don't.

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Example of Intermediate operations are:

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