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( ...
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...