@Override
public void actionPerformed(ActionEvent e) {
if ("排序".equals(e.getActionCommand())) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
System.out.println("排序");
center.removeAll();
center.add(new JLabel("tianjia"));
center.updateUI();
center.repaint();
}
});
}
}
添加了监听事件 center 为一个JPanel对象
移除—添加—更新—重绘