Java ArrayLists

ArrayList ArrayListName = new ArrayList();


ArrayList ArrayListName = new ArrayList(5);
  //The 5 sets the initial element capcaity.  The default is 10.


ArrayList ArrayListName = new ArrayList(collectionIn);
  //creates a new ArrayList with the elements of a collection.
  //Elements are read from the collection with an Iterator.

int arrayListSize = arrayListName.size();


boolean isArrayListEmpty = arrayListName.isEmpty();


int objectFirstFoundAt = 
  arrayListName.indexOf(objectToSearchFor);


int objectLastFoundAt = 
  arrayListName.lastIndexOf(objectToSearchFor);


boolean isObjectInArrayList = 
  arrayListName.contains(objectToSearchFor);

Object objectName = 
  (ClassTypeToCastTo) arrayListName.get(intOffsetToGetElementAt);
//note: Objects coming out of ArrayLists have lost 
//  their class type, and must be cast

boolean addWasGood = 
  arrayListName.add(objectToAdd);
  //inserts at end


arrayListName.add(intOffsetToSetElementAt, objectToAdd);
  //inserts at offset, no boolean returned


arrayListName.addAll(collectionToAdd);
arrayListName.addAll(intOffsetToAddCollectionAt, collectionToAdd);


arrayListName.set(intOffsetToSetElementAt, objectIn);
  //replaces element at offset


arrayListName.remove(intOffsetToRemoveElementAt);
  //deletes element at offset


arrayListName.removeRange
  (intOffsetToRemoveElementFromInclusive, 
   intOffsetToRemoveElementToExclusive);
  //deletes from start offset up to the end offset
  //note - element at the end offset is not deleted


arrayListName.clear();

Object[] arrayToCopyArrayListInto = arrayListName.toArray();