JAVA实现的酒店管理系统

				package tools;
				
				/*
				 * @Author:黄顺武
				 * Create Time:2008-2-22
				 * Description:判断用户输入的年月格式是否符合规范
				 */
				import java.util.StringTokenizer;
				import javax.swing.JOptionPane;
				
				public class CheckYearAndMonth {
				
					private static int year = -1;
					private static int month = -1;
				
					public CheckYearAndMonth() {
				
					}
				
					public static String check(String value) {
						try {
							if (value.indexOf("-") == -1) {
								JOptionPane.showMessageDialog(null, "年月必须为如:2007-09的格式!", "",
										JOptionPane.INFORMATION_MESSAGE);
								return null;
							}
							StringTokenizer st = new StringTokenizer(value, "-");
							if (st.countTokens() != 2) {
								JOptionPane.showMessageDialog(null, "年月必须为如:2007-09的格式!", "",
										JOptionPane.INFORMATION_MESSAGE);
								return null;
							}
							int count = 0;
							if (year != -1) {
								year = -1;// 重新初始化,解决在同一个类中调用时不能被多次初始化的问题
							}
							if (month != -1) {
								month = -1;// 重新初始化,解决在同一个类中调用时不能被多次初始化的问题
							}
							while (st.hasMoreTokens()) {
								count++;
								if (count == 1) {
									year = Integer.valueOf(st.nextToken());
								} else if (count == 2) {
									month = Integer.valueOf(st.nextToken());
									break;
								}
							}
							if (year 								JOptionPane.showMessageDialog(null, "年月必须为如:2007-09的格式!", "",
										JOptionPane.INFORMATION_MESSAGE);
								return null;
							}
						} catch (NumberFormatException nfe) {
							JOptionPane.showMessageDialog(null, "年月必须为如:2007-09的格式!", "",
									JOptionPane.INFORMATION_MESSAGE);
							return null;
						}
						return value;
					}
				
					public int getYear() {
						return year;
					}
				
					public int getMonth() {
						return month;
					}
				}