java的confirm确认取消对话框

int n = JOptionPane.showConfirmDialog(null, "确认删除吗?", "确认对话框", 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");}