Troubleshooting NullPointerException
Q
What is NullPointerException and how to handle it?
✍: FYIcenter
A
When an object is not initialized, the default value is null. When the following things happen, the NullPointerException is thrown:
- Calling the instance method of a null object.
- Accessing or modifying the field of a null object.
- Taking the length of a null as if it were an array.
- Accessing or modifying the slots of null as if it were an array.
- Throwing null as if it were a Throwable value.
The NullPointerException is a runtime exception. The best practice is to catch such exception even if it is not required by language design.
2007-03-03, 9002👍, 0💬
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