Avoiding null pointer exceptions is a good programming practice. However, simple things such as string comparison can also lead to null pointer exceptions.
Considering the following:
You have a constant string and a variable string to be compared. There are 2 ways of checking their equality, however the variable string can be null in both the cases.
Case 1: variableString.equals(constantString) Case 2: constantString.equals(variableString)
In the above cases, case 1 can lead to a null pointer exception if the variableString is null. However, in case 2 it does not lead to a null pointer exception, thereby your program becomes safer. Please consider such recommendations while writing your code.