06 Input and Scanner - mazawi/Teaching-Java GitHub Wiki

In Java, you can read input from various sources, such as the keyboard, files, or other input devices.
The standard way to read input from the keyboard is to use the Scanner class, which is part of the java.util package.
To use Scanner, you need to import it at the beginning of your Java program like this:

import java.util.Scanner;

To read input from the keyboard, you create an instance of the Scanner class, typically like this:

Scanner scanner = new Scanner(System.in);

You can then use the Scanner object to read various types of input, such as integers, floating-point numbers, strings, and more.

Here's an example of reading an integer from the user:

System.out.print("Enter an integer: ");
int number = scanner.nextInt();

System.out.print("Enter a string: ");
String inputString = scanner.next();

After reading input, it's good practice to close the Scanner to release system resources:

scanner.close();

You can handle exceptions, such as InputMismatchException or NoSuchElementException, when dealing with input to ensure your program doesn't crash due to unexpected input.
When reading from files or other sources, you'll use different classes, such as FileInputStream and BufferedReader, to handle input.