In this Spring Security tutorial, you will learn how to enable Basic Authentication for your Spring Boot project and configure the default username, password and user role. You will also learn how to secure a web service request URL so only authenticated users with a default username, password and role can access it. If you use…
Read More Spring Security Default Username, Password, RoleIn this tutorial, you will learn what the @Controller annotation is and how to use it in Spring. You will use @Controller annotation to mark a class as a Spring MVC controller. It is generally used with @RequestMapping annotation to map HTTP requests to specific methods in a controller class. How to User @Controller Annotation…
Read More @Controller Annotation in SpringSDKMAN is a tool that allows developers to easily manage multiple versions of software development kits (SDKs) on their system. It allows developers to switch between different versions of the same SDK, making it easy to test their code on different versions of the platform. To get started with SDKMAN, you will first need to…
Read More SDKMAN Tutorial for BeginnersIn this lesson, you will learn about Java history, the types of Java programs, and what Java editions exist today. History Sun Microsystems Inc developed Java in 1991 by the Green Team, whose members were James Gosling, Mike Sheridan, and Patrick Naughton. First, it was developed as a pilot project of a simple language for programming smart home…
Read More Introduction to JavaIn today’s world of agile development, writing unit tests is vital and helpful in producing high-quality code. Unit tests ensure that the code complies with quality standards and that issues are identified before deployment. Java offers various testing frameworks to make the lives of developers easier, with Mockito being one of the well-known ones. In…
Read More An Introduction to the Mockito Frameworkclass Test { public void print(String word) { System.out.println(word); } } class Test2 { public void callPrintMethod() { Test test = new Test(); test.print(“Hello”); } } class Test { public static void print(String word) { System.out.println(word); } public static void main(String[] args) { print(“Hello!”); // OK Test.print(“Hello!”); // OK } } class Test2 { public…
Read More Java Instance and Static Methodspublic void methodName() { // code to be executed } public void methodName(int num, String data) { // code to be executed } methodName() methodName(10, “dataString”); class Test { public int sumNumbers(int a, int b) { int sum = a + b; return sum; } public static void main(String[] args) { int num1 = 10;…
Read More Methods in Javatype variableName = variableValue; public class Car { String brand; int maxSpeed; } class Car { String brand; int maxSpeed; public void printFields() { System.out.println(“BRAND: ” + brand); System.out.println(“MAX SPEED: ” + maxSpeed); } } public class Test { public static void main(String[] args) { Car ford = new Car(); ford.brand = “Ford”; ford.maxSpeed =…
Read More Variable in Javaclass Car { int numberOfSeats = 4; void addOneSeat(int numberOfSeats) { numberOfSeats = numberOfSeats + 1; // changes will only affect the local variable } public static void main(String args[]) { Car car = new Car(); System.out.println(“Number of seats before the change: ” + car.numberOfSeats); car.addOneSeat(car.numberOfSeats); System.out.println(“Number of seats after the change ” + car.numberOfSeats);…
Read More Java Pass-by-Value vs Pass-by-ReferencePrimitive type Wrapper class boolean Boolean byte Byte char Character float Float int Integer long Long short Short double Double class Test { int id = 5; Integer id1 = id; // autoboxing } class Test { public static void main(String[] args) { int a = 10; int b = 20; List<Integer> list = new…
Read More Autoboxing and Unboxing in Javabyte Uses 1 byte (8 bits) for a binary record of integers Values of this type are integers in the range -2 ^ 7 to 2 ^ 7-1, ie. [-128, 127] The default value is 0 Example: byte var1=120, byte var2=-30 short Uses 2 bytes (16 bits) to write integer binaries Values of this type…
Read More Java Data types1 public class HelloWorldClass { 2 3 public static void main(String[] args) { 4 System.out.println(“Hello World!”); 5 } 6 }
Read More How to Compile and Run your First Java Program