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JavaBat java practice problems

Free online Java practice problems -- basic logic, strings, loops, arrays, and recursion (example problem). Practice for an exam, or as homework, or in a lab. Teachers can get a summary table of their student's done problems. See Also: Example Code Java help: If Boolean Logic | Strings | While and For Loops | Arrays and Loops

Warmup
Simple problems to get started (solutions avail)
sleepIn H    monkeyTrouble H    sumDouble H      more
Warmup2
Simple string and array loops (solutions avail)
stringTimes H    frontTimes H    stringBits H      more
String1
Basic string problems -- no loops
helloName    makeAbba    makeTags      more
Array1
Basic array problems -- no loops
firstLast6    sameFirstLast    makePi      more
Logic
Little boolean logic puzzles -- if else && || !
cigarParty H    dateFashion H    squirrelPlay      more
AP1
AP CS practice problems
scoresIncreasing    scores100    scoresClump      more
String2
Medium String problems -- 1 loop
doubleChar H    countHi H    catDog      more
String3
Harder String problems -- 2 loops
countYZ    withoutString    equalIsNot      more
Array2
Medium array problems -- 1 loop.
See the Java Arrays and Loops document for help.
countEvens    bigDiff    centeredAverage      more
Array3
Harder array problems -- 2 loops, more complex logic.
See the Java Arrays and Loops document for help.
maxSpan    fix34    fix45      more
Recur1
Basic recursion problems
factorial H    bunnyEars H    fibonacci      more
Recur2
Harder recursion problems
groupSum H    groupSum6    groupNoAdj      more

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