sketch of Runtime.exec() and Calendar; misc bugfixes

classpath/java/util/Calendar.java

@@ -11,4 +11,77 @@ public abstract class Calendar {
   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 abstract void roll(int field, boolean up);
+
+  public void roll(int field, int amount) {
+    boolean up = amount >= 0;
+    if (! up) {
+      amount = - amount;
+    }
+    for (int i = 0; i < amount; ++i) {
+      roll(field, up);
+    } 
+  }
+
+  public abstract int getMinimum(int field);
+
+  public abstract int getMaximum(int field);
+ 
+  public abstract int getActualMinimum(int field);
+
+  public abstract int getActualMaximum(int field);
+
+  private static class MyCalendar extends Calendar {
+    public MyCalendar(long time) {
+      this.time = time;
+      this.isTimeSet = true;
+    }
+
+    public void roll(int field, boolean up) {
+      // todo
+    }
+
+    public int getMinimum(int field) {
+      // todo
+      return 0;
+    }
+
+    public int getMaximum(int field) {
+      // todo
+      return 0;
+    }
+ 
+    public int getActualMinimum(int field) {
+      // todo
+      return 0;
+    }
+
+    public int getActualMaximum(int field) {
+      // todo
+      return 0;
+    }
+  }
 }