public class GenericClass <T> GenericClass<Type> obj = new GenericClass<Type>(); List<String> list = new ArrayList<>(); Map<Integer, String> map = new HashMap<>(); Set<String> set = new HashSet<>(); public class Test <T> { private T data; public Test(T data) { this.data = data; } public static void main(String[] args) { Test<Integer> test1 = new Test<>(10); Test<String> test2 =…
Read More Generics in Java with Examplespublic class TestMultithreading extends Thread { public void run() { System.out.println(“The thread is running…”); } public static void main(String args[]) { TestMultithreading test = new TestMultithreading(); test.start(); } } Output: The thread is running… Get the id and name of a thread public class TestMultithreading extends Thread { public void run() { System.out.println(“ID: “…
Read More Multithreading in Javaimport java.io.Serializable; public class User implements Serializable { transient int userId; String name; public User(int userId, String name) { this.userId = userId; this.name = name; } } import java.io.* public class Test { public static void main(String args[]) { try { User user1 = new User(15, “Ryan”); //Write the object in a stream FileOutputStream outputStream…
Read More Transient Keyword in Java (Explained!)In this tutorial, we will cover the basics of serialization and deserialization, including the importance of the ObjectOutputStream and ObjectInputStream classes, the use of the transient keyword, and the implementation of custom serialization methods. We’ll also provide code examples and address some common questions about these concepts. Let’s get started! What are Serialization and Deserialization…
Read More Serialization and Deserialization in Java: A Comprehensive Guidepublic void printData(int data) { System.out.println(data); printData(data); } public static void printData(int data) { if (data > 0) { System.out.println(data); printData(–data); } } Output: 5 4 3 2 1 public class Test { public static void main(String[] args) { System.out.println(factorial(5)); } static int factorial(int num) { if (num == 1) { return 1; } else…
Read More What is Recursion in Java?class ClassA implements Cloneable { private int someNum; private ClassC nestedObjectReference; @Override public Object clone() throws CloneNotSupportedException { ClassA classA = (ClassA) super.clone(); // with this, we are ensuring that deep copy will be performed classA.setNestedObjectReference((ClassC) this.nestedObjectReference.clone()); return classA; } // constructor, getters and setters } class ClassC implements Cloneable { private String classData; public…
Read More What is a Deep Copy in Java?protected Object clone() throws CloneNotSupportedException class ClassA implements Cloneable { private int someNum; private ClassC nestedObjectReference; @Override public Object clone() throws CloneNotSupportedException { return super.clone(); } // getter and setter methods } class ClassC { private String classData; public ClassC(String classData) { this.classData = classData; } // getter and setter methods } public class Test…
Read More Object Cloning in JavaReactive Programming Tutorials Introduction to Reactive Programming Introduction to Reactive Streams in Java Project Reactor in Java Create a Mono in Java Reactor Subscribe to a Mono in Java Reactor Extract data from Mono in Java Create a Flux in Java Reactor Subscribe to Flux in Java Reactor Extract data from Flux Convert Mono to…
Read More Java Reactive Programming TutorialsThis tutorial will be part of our Series on Reactive Programming in Java and Spring Framework. If you have not read the previous article, I would strongly advise you to do so. This will help you to understand better as we go further. In the previous blog post, we discussed publishers and subscribers in Java.…
Read More Reactive Programming: Creating Publishers and Subscribers in Java.public sealed class Vehicle permits Car, Truck, Bus {} final class Bus extends Vehicle { } non-sealed class Truck extends Account { } sealed class Car permits BlueCar, RedCar{ } public abstract sealed class User permits PremiumUser, AdvancedUser { public abstract String getUserData(); } non-sealed class PremiumUser extends User { @Override public String getUserData() {…
Read More Sealed Classes and Interfaces in Javaclass Test { public static void main(String[] args) { String name = null; System.out.println(name.toUpperCase()); } } Output: Exception in thread “main” java.lang.NullPointerException at com.example.Test.main (Test.java:9) Here, we got an error message that the NPE has occurred on line 9. Unfortunately, we can’t conclude which value exactly was null from the message. class Test { public static…
Read More Helpful NullPointerExceptions (NPE) in Javaclass Test { public static void main(String[] args) { Vehicle vehicle = new Car(); if (vehicle instanceof Car) { Car car = (Car) vehicle; car.openTrunk(); // other code … } else if (vehicle instanceof Truck) { Truck truck = (Truck) vehicle; truck.removeTrailer(); // other code … } } } class Test { public static void…
Read More Java Pattern Matching for instanceofclass User { private String name; private String username; private String membershipType; private String address; public User(String name, String username, String membershipType, String address) { this.name = name; this.username = username; this.membershipType = membershipType; this.address = address; } public String getName() { return name; } public void setName(String name) { this.name = name; } public…
Read More Java RecordsString multilineText= “”” Hi, this is one simple example of a multiline text”””; class Test { public static void main(String[] args) { String example = “{\”key1\”:\”value1\”,\”key2\”:” + “\”value2\”,\”key3\”:\”value3\”}”; System.out.println(example); } } Output: {“key1″:”value1″,”key2″:”value2″,”key3″:”value3”} Now, let’s use a Text Block: class Test { public static void main(String[] args) { String example = “”” { “key1”:…
Read More Java Text Blocks