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WithoutBook LIVE Mock Interviews Java 8 Related interview subjects: 39

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Know the top Java 8 interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Intermediate / 1 to 5 years experienced level questions & answers

Ques 1

What is lambda expression?

Lambda expression is anonymous function which have set of parameters and a lambda (->) and a function body. You can call it function without name.

Structure of Lambda Expressions:
(Argument List) ->{expression;} or
(Argument List) ->{statements;}

For instance, the Runnable interface is a functional interface, so instead of:
Thread thread = new Thread(new Runnable() {
    public void run() {
        System.out.println("Hello World!");
    }
});
 
Using Lambda you can simply do the following:
Thread thread = new Thread(() -> System.out.println("Hello World!"));

Functional interfaces are usually annotated with the @FunctionalInterface annotation - which is informative and does not affect the semantics.
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Ques 2

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 3

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 4

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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