如何更新 Java 中的 JFrame？

Question

I have that code

import javax.swing.JFrame;
import javax.swing.JLabel;

    public class ChatClient extends JFrame {
        public static void main(String[] args) throws InterruptedException {
            JFrame frame=new JFrame("chat");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setSize(400,400);
            frame.setVisible(true);
            frame.setLayout(null);
            JLabel label=new JLabel();
            label.setText("HOR");
            label.setBounds(100,100,100,100);
            frame.add(label);
            Thread.sleep(1000);
            JLabel label1=new JLabel();
            label1.setText("SE");
            label1.setBounds(100,200,100,100);
            frame.add(label1);
        }
    }

I want write multiple strings in the frame but at different times. The problem is that "hor" is printed correctly, but "se" is printed only if I change the size of the window or if I minimize it. I think "se" is not printed until I update the frame. I know that i can resolve with frame.repaint() after Thread.sleep() , but is the more appropriate method?

Answer 1

Setup the Frame completely before sleep and then change the text after sleep

private static void drawFrame() {
    JFrame frame=new JFrame("chat");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400,400);
    frame.setVisible(true);
    frame.setLayout(null);
    JLabel label=new JLabel();
    label.setBounds(100,100,100,100);
    frame.add(label);
    JLabel label1=new JLabel();
    label1.setBounds(100,200,100,100);
    frame.add(label1);
    label.setText("HOR" + LocalDateTime.now().format(DateTimeFormatter.ISO_LOCAL_TIME));
    // frame elemets setup
    
    sleep();
    label1.setText("HOR" + LocalDateTime.now().format(DateTimeFormatter.ISO_LOCAL_TIME));
}