Java 8 Interview Questions and Answers
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Ques 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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Ques 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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Ques 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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Ques 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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Ques 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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