Java Syntax Guide

Java is a widely-used programming language known for its "write once, run anywhere" principle. This guide provides a brief overview of the syntax commonly used in Java programming.

Basic Structure

In Java, every program starts with a class. The main class contains the main method, which is the entry point of the program.

public class Main {
    public static void main(String[] args) {
        // Your code here
    }
}

Variables and Data Types

Java uses data types to define the kind of data a variable can hold. Common data types include:

int for integers
double for floating-point numbers
boolean for true/false values
String for text

int number = 5;
double pi = 3.14159;
boolean isTrue = true;
String name = "John Doe";

Control Structures

Java provides various control structures for controlling the flow of the program.

If-Else

if (number > 0) {
    System.out.println("Number is positive.");
} else {
    System.out.println("Number is not positive.");
}

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++;
}

Functions

Functions are reusable blocks of code that perform a specific task.

public static void greet(String name) {
    System.out.println("Hello, " + name + "!");
}

public static void main(String[] args) {
    greet("John Doe");
}

Object-Oriented Programming (OOP)

Java is an object-oriented programming language. Classes and objects are at the core of OOP.

public class Car {
    private String brand;
    private int year;

    public Car(String brand, int year) {
        this.brand = brand;
        this.year = year;
    }

    public void displayInfo() {
        System.out.println("Brand: " + brand);
        System.out.println("Year: " + year);
    }
}

public static void main(String[] args) {
    Car myCar = new Car("Toyota", 2020);
    myCar.displayInfo();
}

Resources

For more detailed information about Java syntax, you can visit our comprehensive Java Tutorial.