folkol questions

folkol answers

• I cannot exit Vim, I hit escape and tried :q :x :qx [duplicate]
• Why should I mark all methods virtual in C++? Is there a trade-off?
• How to return value from thread (java)
• Mongo database Invalid BSON field name exception
• do synchronized java methods queue calls?
• Get max and min dates from an array [duplicate]
• Java escaping reference to 'this'
• Swapping uppercase and lowercase in a string
• What do [] brackets in a for loop in python mean?
• Java Package Import Alias [duplicate]