W3Schools Tryit Editor

import java.util.Scanner; // import the Scanner class 
class Main {
 public static void main(String[] args) {
 Scanner myObj = new Scanner(System.in);
 String userName;
 
 // Enter username and press Enter
 System.out.println("Enter username"); 
 userName = myObj.nextLine(); 
 
 System.out.println("Username is: " + userName); 
 }
}