Top Ten Errors Java Programmers Make(1)# Java - 爪哇娇娃
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1. Null pointers!
Null pointers are one of the most common errors that Java programmers
make. Compilers can't check this one for you - it will only surface at
runtime, and if you don't discover it, your users certainly will.
When an attempt to access an object is made, and the reference to that
object is null, a NullPointerException will be thrown. The cause of null
pointers can be varied, but generally it means that either you
haven't initialized an object, or you haven't checked the return val
Null pointers are one of the most common errors that Java programmers
make. Compilers can't check this one for you - it will only surface at
runtime, and if you don't discover it, your users certainly will.
When an attempt to access an object is made, and the reference to that
object is null, a NullPointerException will be thrown. The cause of null
pointers can be varied, but generally it means that either you
haven't initialized an object, or you haven't checked the return val