Java for Testing
Tutorials, guides, and interview prep for QA automation engineers.
Count Vowels and Consonants in Java | Step-by-Step Guide with Code Examples
Learn how to count vowels and consonants in Java strings. Includes multiple methods, code examples, and handles uppercase, lowercase, and special characters.
JDBC and Database Connectivity in Java: Steps & Examples
Learn JDBC in Java — what it is, what a JDBC driver does, and the standard steps to connect a Java application to a database, with a full code example.
Java Strings, Wrapper Classes, and Exception Handling
Learn Java strings and mutability, StringBuffer vs StringBuilder, wrapper class hashCode/equals, exception handling, and ClassNotFound vs NoClassDefError.
Java Collections: Set, HashMap, ArrayList vs LinkedList & Thread-Safe Maps
Learn Java collections — the Set interface, HashMap internals, ArrayList vs LinkedList, synchronized maps vs ConcurrentHashMap, and forEach vs Iterator.
Interfaces in Java: Comparable, Default Methods, Nested & Final
Learn interfaces in java — the Comparable interface, Java 8 default methods, why interfaces can't be instantiated or final, and nested interfaces, with examples.
Java OOP & Keywords: Access Modifiers, super, Constructors & Overriding
Learn Java OOP essentials — Java access modifiers, the super keyword, break in switch, default constructors, and method overriding rules — with examples.
Jvm and java execution & Platform Independence in Java
Understand the JVM, how Java program execution begins, static blocks before main, platform independence, and class/file naming rules — with examples.
Java Basics: Variables, Objects, Datatypes & Loops Explained
Learn Java basics — types of variables, creating objects, the byte datatype, and while vs do-while loops — with real-life and automation testing examples.