java的confirm确認取消對話框

int n = JOptionPane.showConfirmDialog(null, "确認删除嗎?", "确認對話框", JOptionPane.YES_NO_OPTION); 
if (n == JOptionPane.YES_OPTION) { 
	JOptionPane.showMessageDialog(new JFrame(),"已删除");
} else if (n == JOptionPane.NO_OPTION) { 
	JOptionPane.showMessageDialog(new JFrame(),"已取消");
}