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Simple java authenticator.
 
import java.io.*;
import java.util.*;
 
public class test implements Runnable{
    int code;
    Random random;
    BufferedReader reader;
    Thread thread;
    String answer;
    int intanswer;
    
public void controll(){
if(intanswer != code){
    System.out.println("Authentication failed.");
    System.exit(0);}}
 
 void authenticate()throws IOException{
     thread=new Thread();
     random=new Random();
     reader=new BufferedReader(new InputStreamReader(System.in));
     code=random.nextInt(999999999);
       System.out.println("Please, rewrite generated code below: " + code);
       answer=reader.readLine();
       intanswer=Integer.parseInt(answer);
        try{
            System.out.println("\n" + "Checking...");
            thread.sleep(2500);
            controll();
            System.out.println("Confirming...");
            thread.sleep(3000);
            controll();
            System.out.println("Done!");
        }
        catch(InterruptedException e){System.out.println(e);}
 }
public void run(){}
public static void main(String args[])throws IOException{
    test x = new test();
    x.authenticate();
}
}