Returning null as an int permitted with ternary operator but not if statement
Let’s look at the simple Java code in the following snippet: public class Main { private int temp() { return true ? null … Read more
nullpointerexception
Why explicitly throw a NullPointerException rather than letting it happen naturally?
When reading JDK source code, I find it common that the author will check the parameters if they are null and then throw … Read more
Android. Fragment getActivity() sometimes returns null
In developer console error reports sometimes I see reports with NPE issue. I do not understand what is wrong with my code. On … Read more
What is a NullPointerException, and how do I fix it?
This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. … Read more
Android – How To Override the “Back” button so it doesn’t Finish() my Activity?
I currently have an Activity that when it gets displayed a Notification will also get displayed in the Notification bar. This is so … Read more
Converting a Date object to a calendar object [duplicate]
This question already has answers here: Date object to Calendar [Java] (8 answers) Closed 5 years ago. So I get a date attribute … Read more
Filter values only if not null using lambda in Java8
I have a list of objects say car. I want to filter this list based on some parameter using Java 8. But if … Read more
Best explanation for languages without null
Every so often when programmers are complaining about null errors/exceptions someone asks what we do without null. I have some basic idea of … Read more
No Exception while type casting with a null in java
String x = (String) null; Why there is no exception in this statement? String x = null; System.out.println(x); It prints null. But .toString() … Read more
Why use Optional.of over Optional.ofNullable?
When using the Java 8 Optional class, there are two ways in which a value can be wrapped in an optional. String foobar … Read more