⌨️ Java User Input using Scanner

? Quick Overview

In Java, user input from the keyboard is commonly handled using the Scanner class. It allows programs to read numbers, text, and other data types interactively.

? Key Concepts

• Scanner is part of java.util package
• Reads input from different sources (keyboard, files, etc.)
• System.in represents standard input (keyboard)
• Different methods are used for different data types

? Syntax / Theory

To use Scanner, you must import it and create an object linked to System.in. Each method reads a specific type of input.

• nextInt() → integer input
• nextDouble() → decimal input
• next() → single word
• nextLine() → full line of text

? Code Example(s)

// Import Scanner class for user input
import java.util.Scanner;

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

// Create Scanner object to read input from keyboard
Scanner sc = new Scanner(System.in);

// Ask user for their name
System.out.print("Enter your name: ");
String name = sc.nextLine();

// Ask user for their age
System.out.print("Enter your age: ");
int age = sc.nextInt();

// Display the entered data
System.out.println("Name: " + name);
System.out.println("Age: " + age);

// Close the scanner to free resources
sc.close();
}
}

? Live Output / Explanation