Java for Testers

Learn that the Java main method is the program’s entry point, public static void main(String[] args) used to start a program, while automation tests rely on test annotations.

Explore type casting in Java by performing widening casting from byte to int and narrowing casting from double to int, using explicit casts and System.out.println to verify results.

Declare and use arrays in Java to store multiple values in a single variable, including strings and integers. Access by zero-based indices, modify elements, and loop to print each value.

Explore how Java operators work, including arithmetic, assignment, comparison, and logical operators, with examples of incrementing variables and evaluating expressions for test automation.

Explore Java conditional statements using if, else, and else if to execute code based on boolean conditions, compare values, and combine conditions with logical operators; see nested and multi-branch examples.

Explore Java switch statements, using case, break, and default to map month numbers to names, with examples and a test automation scenario for choosing web drivers.

Apply a Java switch statement to map day numbers 1–7 to weekdays, using cases, breaks, and a default, then test outputs and consolidate understanding of switch behavior.

Learn how to use for loops in Java to execute a block of code with initialization, a condition, and increment, and iterate over pages, lists, or arrays.

Learn how method overloading works in Java for testers, using the same method name with int and double parameters to sum inputs and observe the compiler selecting the correct version.

Explore how to implement a method return type in Java by converting a void method to one that returns an integer square, using return statements and illustrating usage with System.out.println.

Learn object oriented programming in Java, focusing on classes as blueprints and objects as instances, and explore how OOP improves flexibility, maintainability, reuse, and reduces code.

Demonstrate classes and objects in Java by defining a class with a private field and a public print number method, then instantiate multiple objects to observe their behavior.

Illustrate classes and objects by creating a lamp class with a private boolean light status and a print method that reports on or off, showing two instances with separate state.

Understand how access modifiers control the visibility of class members, such as fields, methods, and constructors, across packages, subclasses, and all classes, to support encapsulation.

Learn to implement a programming class with a language field and a learning complete flag, expose a status method to show learning or mastered, and demonstrate status changes in main.

Explore the four pillars of object oriented programming: encapsulation, abstraction, inheritance, and polymorphism, and how they shape clean, testable Java code in test automation frameworks and page object models.

Explore abstraction in Java using abstract classes and methods to hide details and expose essentials. Abstract classes cannot be instantiated and must be inherited to implement abstract methods.

Learn to read a text file in Java using File and Scanner, handle file not found exceptions, read lines with hasNextLine, print output, and observe that writing overwrites content.

Compare two popular Java test frameworks: TestNG and JUnit, and examine their setup, annotations, parameterization, and test suites.

Set up a maven project for JUnit testing, verify Maven installation, add the JUnit dependency to pom.xml, and create a calculator class with add and multiply methods for unit tests.

Learn to skip a test in Java for testers by removing or commenting out the @Test annotation or using the disabled annotation, with guidance from the G-Unit documentation.

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