Resolved [java.lang.NullPointerException]
时间: 2023-10-12 11:10:18 浏览: 76
NullPointerException is a common error in Java that occurs when you try to use a null object reference. In other words, you are trying to use an object that has not been initialized or is set to null.
To resolve this error, you need to identify the object that is causing the error and make sure it is properly initialized before you try to use it. You can do this by checking if the object is null before you use it in your code.
Here's an example:
```
String str = null;
if (str != null) {
// do something with str
} else {
// handle null case
}
```
In this example, we check if the string `str` is null before using it. If it is null, we handle the null case appropriately.
You can also use a try-catch block to catch the NullPointerException and handle it in your code. For example:
```
try {
// code that may throw a NullPointerException
} catch (NullPointerException e) {
// handle NullPointerException here
}
```
By handling the exception, you can prevent your program from crashing and provide a more graceful error handling mechanism.
相关推荐
![application/msword](https://img-home.csdnimg.cn/images/20210720083327.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)