Class Calendar

classpath/java/util/Calendar.java:13–188

package java.util;

public abstract class Calendar {
  public static final int AM = 0;
  public static final int AM_PM = 9;
  public static final int DAY_OF_MONTH = 5;
  public static final int DAY_OF_WEEK = 7;
  public static final int HOUR = 10;
  public static final int HOUR_OF_DAY = 11;
  public static final int MINUTE = 12;
  public static final int MONTH = 2;
  public static final int PM = 1;
  public static final int SECOND = 13;
  public static final int YEAR = 1;

  public static final int FIELD_COUNT = 17;

  protected long time;
  protected boolean isTimeSet;
  protected int[] fields = new int[FIELD_COUNT];
  protected boolean areFieldsSet;
  protected boolean[] isSet = new boolean[FIELD_COUNT];

  protected Calendar() { }
 
  public static Calendar getInstance() {
    return new MyCalendar(System.currentTimeMillis());
  }

  public int get(int field) {
    return fields[field];
  }

  public void set(int field, int value) {
    fields[field] = value;
  }

  public void set(int year, int month, int date) {
    set(YEAR, year);
    set(MONTH, month);
    set(DAY_OF_MONTH, date);
  }

  public void setTime(Date date) {
    time = date.getTime();
  }

  public Date getTime() {
    return new Date(time);
  }

  public abstract void roll(int field, boolean up);
  public abstract void add(int field, int amount);

  public void roll(int field, int amount) {
    boolean up = amount >= 0;
    if (! up) {
      amount = - amount;
    }
    for (int i = 0; i < amount; ++i) {