Java Swing - 如何向每個選項卡添加按鈕

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import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
public class Main {
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    JButton btn = new JButton("Test");
    JPanel panel = new JPanel();
    panel.add(btn);
    JTabbedPane tabbedPane = new JTabbedPane();
    tabbedPane.add("Tab1", panel);
    frame.add(tabbedPane, BorderLayout.CENTER);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setMinimumSize(new Dimension(300, 300));
    frame.setVisible(true);
  }
}
 
 
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