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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