Introduction Java 8 introduced several significant features that revolutionized the way Java developers write code. These features, including lambdas, streams, and functional interfaces, have become essential knowledge for any Java developer. In this blog post, we'll explore the top 20 Java 8 coding and programming interview questions and provide concise answers with example code. 1. What are the key features introduced in Java 8? Answer: Java 8 introduced lambdas, streams, default methods, method references, and functional interfaces. 2. What is a lambda expression in Java 8? Answer: A lambda expression is a concise way to represent an anonymous function. It allows you to pass behavior as an argument to methods or define it inline. Example: java List<String> names = Arrays.asList( "Alice" , "Bob" , "Charlie" ); names.forEach(name -> System.out.println(name)); 3. What is a functional interface? Answer: A functional interface is an interface w...
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...