Merge pull request #5 from millpoo/master

Test Pull Request by other
remove unneeded coments
remove unneeded comments, optimize imports
move ParseHex and ParseHexTest to common.basic.practices2014
move ParseHex and ParseHexTest to common.basic.practices2014
split ParseHexTest.testCheckHex to ParseHexTest.testParseHex and ParseHexTest.testToHex
add cases for too long hex string
add cases for too invalid hex string
add test case for constructor
introduce ParseHex.ExceptionInvalidArgument, change default Exception to ExceptionInvalidArgument,  split testParseHex for exception case
change InvalidArgumentException to IllegalArgumentException
reformat code
change expect to more readable
add test code
Merge remote-tracking branch 'origin/master'
add startsWith() in StringUtil.java
add test code
add Test for StringInterning
modify test code of startWith() in StringUtil
modify site name of "Tutorialspoint.com"