difference nullpointer between if and forloop
49
What is a NullPointerException, and how do I fix it?
138823
Why cast null to Object?
19902
Shortcut for "null if object is null, or object.member if object is not null"
58054
When is it OK to catch NullPointerException?
146476
Java: Why aren't NullPointerExceptions called NullReferenceExceptions?
155686
What is a reason of placing boolean or null before comparison operator?
120071
Checking for a null int value from a Java ResultSet
17784
Java if ternary operator and Collections.emptyList()
8808
Strange Java null behavior in Method Overloading
10581
Avoiding NullPointerException in Java
42958
Method Overloading for null argument
49446
How to check for an undefined or null variable in JavaScript?
32886
What is the difference between != and =! in Java?
134644
Compare two objects with .equals() and == operator
104501
How do I enforce null checking?
99447
What is the difference between String? and String! (two ways of creating an optional variable)?
81518
Find out what variable is throwing a NullPointerException programmatically