This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Mahesh G P wrote:My query is "If variable is not initiazlied won't it be null"?
even the declaration wont be in .class file . i.e compiler removes String str; if str doesnt have assigment further lines.
So, checking str have further assignment logic in compiler may be not smart enough to prevent error that you get now ;)