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();
}
}