Java Code

Codility

BinaryGap;
OddOccurrencesInArray;
CyclicRotation;
TapeEquilibrium;
PermCheck;
FrogRiverOne;
MaxCounters;
MissingInteger;
PassingCars;
Distinct;
Triangle.

HackerRank

CountingValleys;
Staircase;
MinMaxSum;
JumpingOnTheClouds.

Coderbyte

LongestWord;
FirstFactorial