Java Catcha

Here are some useful java got-ya that I found out during works, may be useful for interviews

Null Pointer Exception

All statements below will create NPE

int value = (int) null;

float value = (float) null;

Java constructors

• Normally when no constructor is defined, you have access to an emptry constructor automatically. However when you do define a constructor, that implicit constructor is gone
• In an inheritance scheme, the call super() is implicitly called