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. Create custom problems and a Blog for discussions, comments etc.
See Also: Example Code Java help: If Boolean Logic | Strings | While and For Loops | Arrays and Loops

Warmup-1 Simple warmup problems to get started (solutions available) sleepIn H    monkeyTrouble H    sumDouble H      more	Warmup-2 Medium warmup string/array loops (solutions available) stringTimes H    frontTimes H    stringBits H      more
String-1 Basic string problems -- no loops helloName   makeAbba   makeTags     more	Array-1 Basic array problems -- no loops. firstLast6   sameFirstLast   makePi     more
Logic-1 Basic boolean logic puzzles -- if else && || ! cigarParty H    dateFashion H    squirrelPlay     more	Logic-2 Medium boolean logic puzzles -- if else && || ! makeBricks   loneSum   luckySum     more
String-2 Medium String problems -- 1 loop doubleChar H    countHi H    catDog     more	String-3 Harder String problems -- 2 loops countYZ   withoutString   equalIsNot     more
Array-2 Medium array problems -- 1 loop countEvens   bigDiff   centeredAverage     more	Array-3 Harder array problems -- 2 loops, more complex logic maxSpan   fix34   fix45     more
AP-1 AP CS medium problems scoresIncreasing   scores100   scoresClump     more	Recursion-1 Basic recursion problems factorial H    bunnyEars H    fibonacci     more
Recursion-2 Harder recursion problems groupSum H    groupSum6   groupNoAdj     more

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