import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JWindow;
public class Main{
public static void main(String s[]) {
JWindow win = new JWindow();
JPanel pan = new JPanel();
win.add(pan, "Center");
pan.setLayout(new FlowLayout());
pan.add(new JButton("Hello"));
win.setSize(200, 200);
win.setVisible(true);
}
}
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