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 Troubleshooting: Tackling Errors and Exceptions Head-On Welcome to our comprehensive guide to troubleshooting Java errors and exceptions! As a Java developer, encountering errors and exceptions is inevitable, but with the right knowledge and strategies, you can effectively tackle these challenges head-on. In this article, we'll delve into the top 20 Java exceptions and their solutions to empower you in your coding journey. 1. NullPointerException Issue: Null reference is being accessed. Solution: Always check for null values before accessing an object's methods or properties. Example: java String str = null ; if (str != null ) { int length = str.length(); // Check for null before accessing length } else { System.out.println( "String is null." ); } 2. ClassNotFoundException Issue: Class is not found during runtime. Solution: Ensure that the required class is in the classpath or imported correctly. Example: java try { Class.forName( ...