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Java 8 Questions et reponses d'entretien

Test your skills through the online practice test: Java 8 Quiz Online Practice Test

Differences associees

Java 7 vs Java 8	Java 8 vs Java 9

Question 16. Given a list of employees, sort all the employee on the basis of age by using java 8 APIs only.

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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Question 17. Given the list of employees, find the employee with name 'John' using Java 8 API.

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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Question 18. Given a list of employee, find maximum age of employee using Java 8 API.

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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Question 19. Difference between Intermediate and terminal operations in Stream.

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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Question 20. Provide some examples of Intermediate operations.

Example of Intermediate operations are:

filter(Predicate)
map(Function)
flatmap(Function)
sorted(Comparator)
distinct()
limit(long n)
skip(long n)

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