Java Input and Output

1. Printing Output in Java

Java provides two main methods for displaying output:

• System.out.println() – prints text and moves to a new line
• System.out.print() – prints text without a new line

Try this example: Online Java Compiler

public class OutputDemo {
    public static void main(String[] args) {

        System.out.println("Welcome to VINAR TECH Java Tutorial!");
        System.out.print("This is printed on the same line. ");
        System.out.println("This appears after print().");
    }
}

2. Taking User Input using Scanner

The Scanner class is used to accept input from the user. It belongs to the java.util package.

Try example: Online Java Compiler

import java.util.Scanner;

public class ScannerDemo {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.println("Enter your name:");
        String name = scanner.nextLine();

        System.out.println("Enter your age:");
        int age = scanner.nextInt();

        System.out.println("Hello " + name + ", your age is " + age + ".");
        
        scanner.close();
    }
}

Common Scanner Methods

• nextLine() – reads a full line of text
• nextInt() – reads an integer
• nextFloat() – reads a floating-point number
• nextBoolean() – reads true/false

3. Formatting Output

Use System.out.printf() or String.format() to create formatted output.

Try example: Online Java Compiler

public class FormatDemo {
    public static void main(String[] args) {

        String product = "Laptop";
        int quantity = 3;
        double price = 49999.50;

        System.out.printf("Item: %s | Qty: %d | Price: %.2f%n", product, quantity, price);
    }
}

Common Format Specifiers

• %s – String
• %d – Integer
• %f – Floating numbers
• %.2f – Floating value with 2 decimal places
• %n – New line