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Description:problems using ArrayLists in Java

These problems all use the ArrayList class, with generic typing through the angle bracket convention such as ArrayList<Integer>.`

CodingBat will represent ArrayLists in test cases much like arrays, using the square bracket [] syntax. This can sometimes be confusing, since some of the problems in this set use both arrays and ArrayLists. Look to the method header to give you more information about what data structures the input and output represent.

Yes, ArrayList structures can contain null values. There are a few problems that explicitly call this out and they will have specific text about it. On the AP exam FRQs, nulls are only something you have to worry about if you are explicitly warned and if null plays a role in the meaning of the problem.

From Lauren Tan, APCS Teacher at Ridge High School in Basking Ridge, NJ

removeLowerVals H   findAverage H   lotteryTicketChecker H   lotteryTicketCheckerWithRepeats H  

apcsaListFirstCharacters  apcsaListEvenStrings  apcsaListAverageLength  apcsaListIncreasingLength  apcsaListAddSplice  apcsaListFindTarget  apcsaListIncreasingStrings  apcsaListOrderedCharacters  apcsaListJustCharacters  apcsaListLongestPrefix  apcsaListOthersContained  apcsaListModMover 

Enjoy!

apcsaListCompletePairs  apcsaListElementsToIndexes  apcsaListFrequencies  apcsaListMoveExtraDigits  apcsaListMoveExtraBaseDigits  apcsaListMoveGreaterThan 
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