countdays.java~1~

Java+SQL2000宾馆管理系统,可实现简单的管理操作。

/**
 * <p>Title: 宾馆官理系统</p>
 * <p>Description: 第七章实例</p>
 * <p>Copyright: Copyright (c) 2006</p>
 * <p>Company: </p>
 * @author 苏年乐
 * @version 1.0
 */

/**
 * 计算入住天数
 */
public class Countdays {

  private int total = 0;

  public Countdays(String indate, String outdate) {
    //System.out.println("\nhahahahaha");
    mission(indate, outdate);
  }

  public boolean isleapyear(int year) { //判断闰年
    if (year % 4 == 0)return true;
    else
      return false;
  }

  public int yeardays(int a, int b) {
    int yeardays = 0;
    a++;
    while (a < b) {
      if (isleapyear(a))
        yeardays = yeardays + 366;
      else
        yeardays = yeardays + 365;
      a++;
    }
    return yeardays;
  }

  public int judge_february(int year) { //返回二月的天数
    if (isleapyear(year))
      return 29;
    else
      return 28;
  }

  public int toyearbeginning(int year, int month, int day) { //返回当前月月末到年初的天数

    switch (month - 1) {
      case 0:
        return day;
      case 1:
        return 31 + day;
      case 2:
        return 31 + judge_february(year) + day;
      case 3:
        return 62 + judge_february(year) + day;
      case 4:
        return 92 + judge_february(year) + day;
      case 5:
        return 123 + judge_february(year) + day;
      case 6:
        return 153 + judge_february(year) + day;
      case 7:
        return 184 + judge_february(year) + day;
      case 8:
        return 215 + judge_february(year) + day;
      case 9:
        return 245 + judge_february(year) + day;
      case 10:
        return 276 + judge_february(year) + day;
      case 11:
        return 306 + judge_february(year) + day;
      case 12:
        return 337 + judge_february(year) + day;
      default:
        return 0;
    }

  }

  public int toyearend(int year, int month, int day) { //算上当前天

    if (isleapyear(year))
      return 366 - toyearbeginning(year, month, day) + 1;
    else
      return 365 - toyearbeginning(year, month, day) + 1;

  }

  public void compute_total(int yeara, int yearb, int montha, int monthb,
                            int daya, int dayb) {
    if (yeara != yearb)
      total = yeardays(yeara, yearb) + toyearbeginning(yearb, monthb, dayb) +
          toyearend(yeara, montha, daya);
    else
      total = toyearbeginning(yearb, monthb, dayb) -
          toyearbeginning(yeara, montha, daya) + 1; //算上当前天
  }

  public int getdays() {
    return total;
  }

  public void mission(String a, String b) {
    int yeara;
    int yearb;
    int montha;
    int monthb;
    int daya;
    int dayb;

    yeara = Integer.parseInt(a.substring(0, 4));
    yearb = Integer.parseInt(b.substring(0, 4));

    montha = Integer.parseInt(getmonstr(a));
    monthb = Integer.parseInt(getmonstr(b));

    daya = Integer.parseInt(getdaystr(a));
    dayb = Integer.parseInt(getdaystr(b));

    compute_total(yeara, yearb, montha, monthb, daya, dayb);
  }

  public String getmonstr(String t) {
    if (!t.substring(6, 7).equals("-"))
      return t.substring(5, 7);

    else
      return t.substring(5, 6);
  }

  public String getdaystr(String t) {
    int i = t.length() - 1;

    while (t.charAt(i) != '-')
      i--;

    return t.substring(i + 1, t.length());
  }
}