nullpointerexception Archives

Java, Programming

IT Nursery

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 ...

June 3, 2022
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Java, Programming

IT Nursery

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 ...

June 3, 2022
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android, Programming

IT Nursery

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 ...

June 1, 2022
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Java, Programming

IT Nursery

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. ...

May 29, 2022
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android, Programming

IT Nursery

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 ...

May 28, 2022
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Java, Programming

IT Nursery

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 ...

May 28, 2022
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Java, Programming

IT Nursery

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 ...

May 27, 2022
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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 ...

May 25, 2022
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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() ...

May 21, 2022
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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 ...

May 17, 2022
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