A2Z Java Interview Prep

To find the second-highest salary from a list of employees using Java 8 streams, you can follow these steps: Create a list of employees with their salaries. Use Java 8 streams to sort the employees by salary in descending order. Skip the first element (which is the employee with the highest salary). Get the first element of the remaining stream (which is the employee with the second-highest salary). Example code: java import java.util.ArrayList; import java.util.List; class Employee { private String name; private double salary; public Employee (String name, double salary) { this .name = name; this .salary = salary; } public double getSalary () { return salary; } } public class SecondHighestSalary { public static void main (String[] args) { List<Employee> employees = new ArrayList <>(); employees.add( new Employee ( "John" , 60000.0 )); employees.add( new Employe...

Introduction: Exception handling is a crucial aspect of Java development, ensuring robust and error-tolerant code. Experienced Java developers are expected to have a deep understanding of exception handling mechanisms. In this blog post, we'll explore the top 20 interview questions related to exception handling, accompanied by detailed answers and sample code snippets to help you prepare for your next Java interview. 1. What is an exception in Java? An exception is an event that disrupts the normal flow of a program. In Java, exceptions are objects that represent errors or abnormal situations during runtime. java try { // Code that may throw an exception } catch (ExceptionType e) { // Code to handle the exception } 2. Differentiate between checked and unchecked exceptions. Checked exceptions are checked at compile-time, and the programmer is forced to either catch them or declare that the method throws them. Unchecked exceptions, on the other hand, are not checked at ...

Java Streams have revolutionized the way data processing tasks are handled in Java programming. Introduced in Java 8, Streams offer a fluent and functional approach to processing collections of objects. In this guide, we'll delve into what Streams are, how they work, and provide practical examples along the way. Understanding Java Streams: Java Streams represent a sequence of elements that can be processed sequentially or in parallel. They provide a pipeline through which data can be manipulated using various operations such as filtering, mapping, sorting, and aggregating. Benefits of Java Streams: Concise and Readable Code : Streams promote a functional programming style, leading to more concise and readable code compared to traditional imperative approaches. Lazy Evaluation : Stream operations are lazily evaluated, meaning elements are processed only when necessary, improving efficiency. Parallelism : Streams can leverage parallel processing for improved performance on multicore ...