Java programing syntax

Java programing syntax: Java is a high-level, object-oriented programming language. Below are some basic elements of Java syntax with examples:

Comments

• Single-line comment: // This is a single-line comment
• Multi-line comment: /* This is a multi-line comment */

Class Declaration

public class MyClass {
    // class body
}

Main Method

public class MyClass {
    public static void main(String[] args) {
        // code to be executed
    }
}

Variables

• Declaration: int myNumber;
• Initialization: myNumber = 5;
• Combined: int myNumber = 5;

Data Types

int myNumber = 5;
double myDouble = 5.99;
char myChar = 'D';
boolean myBool = true;
String myString = "Hello";

Operators

• Arithmetic Operators: +, -, *, /, %
• Comparison Operators: ==, !=, >, <, >=, <=
• Logical Operators: &&, ||, !

Control Flow Statements

If Statement

if (condition) {
    // code to be executed if condition is true
}

If-Else Statement

if (condition) {
    // code to be executed if condition is true
} else {
    // code to be executed if condition is false
}

Switch Statement

int day = 4;
switch (day) {
    case 1:
        System.out.println("Monday");
        break;
    case 2:
        System.out.println("Tuesday");
        break;
    default:
        System.out.println("Weekend");
}

Loops

For Loop

for (int i = 0; i < 5; i++) {
    System.out.println(i);
}

While Loop

int i = 0;
while (i < 5) {
    System.out.println(i);
    i++;
}

Do-While Loop

int i = 0;
do {
    System.out.println(i);
    i++;
} while (i < 5);

Methods

Method Declaration

public static void myMethod() {
    // code to be executed
}

Method with Parameters

public static void myMethod(String fname) {
    System.out.println(fname + " Refsnes");
}

Method Return Types

public static int myMethod(int x) {
    return 5 + x;
}

Arrays

int[] myNumbers = {1, 2, 3, 4};
System.out.println(myNumbers[0]); // Output: 1

Object-Oriented Programming

Class and Object

public class MyClass {
    int x = 5;
    
    public static void main(String[] args) {
        MyClass myObj = new MyClass();
        System.out.println(myObj.x);
    }
}

Constructor

public class MyClass {
    int x;

    public MyClass() {
        x = 5;
    }

    public static void main(String[] args) {
        MyClass myObj = new MyClass();
        System.out.println(myObj.x);
    }
}

Encapsulation

public class Person {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String newName) {
        this.name = newName;
    }
}

Inheritance

class Animal {
    public void animalSound() {
        System.out.println("The animal makes a sound");
    }
}

class Dog extends Animal {
    public void animalSound() {
        System.out.println("The dog says: bow wow");
    }
}

public class Main {
    public static void main(String[] args) {
        Dog myDog = new Dog();
        myDog.animalSound();
    }
}

Polymorphism

class Animal {
    public void animalSound() {
        System.out.println("The animal makes a sound");
    }
}

class Dog extends Animal {
    public void animalSound() {
        System.out.println("The dog says: bow wow");
    }
}

class Cat extends Animal {
    public void animalSound() {
        System.out.println("The cat says: meow");
    }
}

public class Main {
    public static void main(String[] args) {
        Animal myAnimal = new Animal();
        Animal myDog = new Dog();
        Animal myCat = new Cat();

        myAnimal.animalSound();
        myDog.animalSound();
        myCat.animalSound();
    }
}

These examples cover the basics of Java syntax and object-oriented programming concepts. I hope you will like this article.