In this lesson, you will learn about the history of Java, types of Java programs, Java Virtual Machine (JVM), Java Standard Library and current Java editions. History Java was developed in 1991 by the Green Team, comprising James Gosling, Mike Sheridan, and Patrick Naughton, as a pilot project for a simple language to program smart…
Read More Introduction to Javapublic 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-ReferenceIn addition to the Java Runtime Environment (JRE), the JDK includes the following components: Compiler The Java compiler is used to convert Java source code into bytecode that can be executed on the Java Virtual Machine (JVM). A compiler is a command-line tool that takes a .java file as input and produces a .class file…
Read More JRE, JDK, and JVM: Understanding Differences and UsesPrimitive 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 Programclass Test { public static void main(String[] args) { short a = 10; int b = a; // automatically converts the short type into int type int c = 10; long d = c; // automatically converts the integer type into long type float f = d; // automatically converts the long type into float…
Read More Type Casting in JavaOperator Description Example + Indicates positive value +a – Negates an expression value (Converts positive number to negative) -a ++ Increments a value by 1 ++a — Decrements a value by 1 –a ! Inverts the value of a boolean type !true gives false %= Assigns the remainder to the left operand when dividing the…
Read More Java operatorsJava is a programming language that is widely known for its versatility, power, and many features. It is popular among developers due to its object-oriented design, portability, and strong security. Java’s object-oriented design allows developers to organize their code into modular units, making it easier to build large-scale applications. Java’s portability means that code can…
Read More Java’s Powerful Features: A Comprehensive Guidepublic class App { public static void main(String[] args) { // … } } public class App { public static void main(String[] args) { for(String s : args) { System.out.println(s); } } } public static void main(String[] args) public static void main(String []args) public static void main(String args[]) public static void main(String… args) static public void main(String[] args) public static final void main(String[] args) final public static void main(String[] args)
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