Category:2008-06-04 12:47 467 people read reviews (0) Collection report Linuxjava test Yesterday, When a colleague A is testing a program written by colleague B, an error occurs, looking at the console information and discovering that a null pointer exception was thrown.
The survey results show that when flag does not have a corresponding attribute entry in the configuration file, this vulnerability flag.equals ("true") throws a null pointer error.
Workaround: Use the notation "true" for the specification. Equals (flag), so that if flag is empty, there will be no null pointer exception.
By the way, Equalsignorecase (String str):
public boolean equalsignorecase (String str)
To determine whether the current string is the same as the contents of STR, this method does not distinguish between uppercase and lowercase letters, which are not sensitive to case.
The case is sensitive in Java, and the Linux environment is insensitive to capitalization.
Null pointer exception with flag.equals ("true") in the hidden danger notation
