package es.blueberrypancak.chesskurwa;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.Scanner;

public class Stockfish {
	
	private static String bestMove;
	
	public static void run(String FEN) throws IOException{ // wtf is going on here
		bestMove = "";
		FEN = "position fen " + FEN + "\ngo movetime " + Config.moveTime + "\n";
		Process exe = Runtime.getRuntime().exec(Config.stockfish);
		OutputStream stdin = exe.getOutputStream();
		stdin.write(FEN.getBytes());
		stdin.flush();
		new Thread(new Runnable() {
		     public void run() {
			InputStreamReader reader = new InputStreamReader(exe.getInputStream());
	            	Scanner scan = new Scanner(reader);
	            	while (scan.hasNextLine()) {
	               	String s = scan.nextLine();
	               	System.out.println(s);
	               	if(s.contains("bestmove")) { 
	            	   bestMove = s.split(" ")[1]; 
	             	}
	            }
	            while(exe.isAlive()) { try { exe.getInputStream().close(); } catch (IOException e) { e.printStackTrace(); } exe.destroy(); }
	         }
	      }).start();
	}
	
	public static String getBestMove() {
		return bestMove;
	}
}

package es.blueberrypancak.chesskurwa;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.Scanner;

public class Stockfish {
	
	private static String bestMove;
	
	public static void run(String FEN) throws IOException{ 
		bestMove = "";
		FEN = "position fen " + FEN + "\ngo movetime " + Config.moveTime + "\n";
		Process exe = Runtime.getRuntime().exec(Config.stockfish);
		OutputStream stdin = exe.getOutputStream();
		stdin.write(FEN.getBytes());
		stdin.flush();
		new Thread(new Runnable() {
		     public void run() {
			InputStreamReader reader = new InputStreamReader(exe.getInputStream());
	            	Scanner scan = new Scanner(reader);
	            	while (scan.hasNextLine()) {
	               	String s = scan.nextLine();
	               	System.out.println(s);
	               	if(s.contains("bestmove")) { 
	            	   bestMove = s.split(" ")[1]; 
	             	}
	            }
	            while(exe.isAlive()) { try { exe.getInputStream().close(); } catch (IOException e) { e.printStackTrace(); } exe.destroy(); }
	         }
	      }).start();
	}
	
	public static String getBestMove() {
		return bestMove;
	}
}

Update Stockfish.java