The "Add" button doesn't show in my computer, however, this code work
on some other computer.

import java.awt.*;
import javax.swing.*;

public class AddButton extends JFrame {

  public AddButton() {
    setSize(300, 150);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    JButton b = new JButton("Add");

    Container c = getContentPane();
    c.setLayout(new FlowLayout());
    c.add(b);
    repaint();
  }

  public static void main(String[] args) {
    AddButton re = new AddButton();
    re.setVisible(true);
  }
}

If I delete  "setSize(300, 150);", add "pack()", it works.  But I need
to set exactly size for this component.  What's wrong with this?

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