Java Swing entfernt das Fokusfeld um den Schaltflächentext

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;

public class SwingDemo {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        JFrame jframe = new JFrame("Demo");
        JButton button = new JButton("JB");
        button.addActionListener(new ActionListener() {
            
            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println("click JB");
            }
        });
        //去掉按钮文字周围的焦点框
        button.setFocusPainted(false);
        
        jframe.getContentPane().add(button);
        jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        jframe.setBounds(100, 100, 200, 136);
        
        jframe.setVisible(true);
    }

}