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In general, I ran into a strange problem. This code works without any complaints, but when I try to go to the full-screen game window in this case (PlayerUnknown's Battlegrounds), this program simply closes (there is nothing in the console), but if you do not call frame.repaint (); then the program works without problems. I really hope for help ...

import javax.swing.JFrame; public class MainClass { public static void main(String[] args) { JFrame frame = new JFrame(); frame.setSize(700, 400); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLocationRelativeTo(null); frame.setVisible(true); while (true) { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } frame.repaint();//Это строка как-то на это влияет } } }

    2 answers 2

    Swing objects are not thread safe . Therefore, you should create a frame in the dispatch stream:

     public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } private static void createAndShowGUI() { JFrame frame = new JFrame(); frame.setSize(700, 400); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLocationRelativeTo(null); frame.setVisible(true); }

      Solved the problem with

      frame.createBufferStrategy (4);