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2019.4.34

public class book {
       public static ConcurrentHashMap
   
     map = new ConcurrentHashMap<>();    private static final Pattern IMG_PATTERN = Pattern.compile(".");    private ExecutorService executor = Executors.newCachedThreadPool();    private URL urlToProcess;    public static void main(String[] args) throws InterruptedException, ExecutionException, IOException {
           Scanner input = new Scanner(System.in);        EventQueue.invokeLater(() ->        {
               var frame = new ClassLoaderFrame();            frame.setTitle("ClassLoaderTest");            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);            frame.setVisible(true);        });    }}
   

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