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When I code I am frustrated with null checks. Especially while coding data structures!
I have to do it as
String val;
if(a != null && a.child != null)
val = a.child.getValue();
else
val = null;
Something sort of this...
Is there a operator like ?. (which is a part of C#) for Java to shorten the burden ?
С# example:
String val = a?.child?.getValue();
943
It is generally a bad practice to catch NullPointerException. Programmers typically catch NullPointerException under three circumstances: The program contains a null pointer dereference. Catching the resulting exception was easier than fixing the underlying problem.
In Java, the java. lang. NullPointerException is thrown when a reference variable is accessed (or de-referenced) and is not pointing to any object. This error can be resolved by using a try-catch block or an if-else condition to check if a reference variable is null before dereferencing it.
NullPointerException is a runtime exception in Java that occurs when a variable is accessed which is not pointing to any object and refers to nothing or null. Since the NullPointerException is a runtime exception, it doesn't need to be caught and handled explicitly in application code.
To check if a string is null or empty in Java, use the == operator.
No
As with most things in Java, you have to do it in the long winded way. Hey, at least it is more readable - if you have to do a null check, why not make it explicit and easily visible (playing devil's advocate here)
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