BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

import java.util.Scanner; // enter the before the start of any class
// declare the class here
// this is an example of how to use the Scanner in a method
Public static void Username();{
Scanner Input = new scanner (System.in);
String username// declaring the username variable
Scanner un = new Scanner(System.in); //  un is just a random variable you can choose any other variable name if you want
System.out.println("Enter Your Username");
username = un.next();
System.out.println("The username you entered is : " + username);}

import java.util.Scanner;
// Declare the class here
// this is an example of how to use the Scanner in a method for an integer input by user
Public static void booksRead();{
Scanner Input = new scanner (System.in);
int books // declaring the books variable
Scanner br = new Scanner(System.in); //  br is just a random variable you can choose any other variable name if you want
System.out.println("Enter how many books have you read: ");
books = br.next();
System.out.println("The number of books you have read is : " + books);}

This will print the number entered by user :

Scanner reader = new Scanner(System.in);  // Reading from System.in
    System.out.println("Enter a number: ");
    int n = reader.nextInt(); // Scans the next token of the input as an int.
    //once finished
    System.out.println(n);
    reader.close();


}