Cannot invoke "com.teach.javafxclient.request.DataResponse.getCode()" because "res" is null
时间: 2023-12-25 07:50:37 浏览: 19
这个错误是因为你尝试访问一个空对象 `res` 的 `getCode()` 方法。在使用对象之前,必须首先确保对象不为 null。你可以通过添加一个 null 检查来解决这个问题,例如:
```
if (res != null) {
int code = res.getCode();
// 其他操作
} else {
// 处理对象为空的情况
}
```
相关问题
Cannot invoke String.equals(Object) because pro1 is null
这个错误是因为你调用了一个空对象的 equals 方法。你需要先检查 pro1 是否为 null,然后再调用 equals 方法。例如:
```
if (pro1 != null && pro1.equals("someString")) {
// do something
}
```
这样就可以避免因为空对象引起的 NullPointerException 错误。
Cannot invoke "String.equalsIgnoreCase(String)" because "code" is null
I apologize for the inconvenience. It seems that the variable "code" is currently null, which is causing the error when trying to invoke the `equalsIgnoreCase()` method on it.
To avoid this error, you should check if the "code" variable is null before invoking any methods on it. You can use an if statement or a null check to ensure that the variable has a value before performing any operations on it.
Here's an example of how you can modify your code to handle this situation:
```java
if (code != null && code.equalsIgnoreCase("yourString")) {
// Perform the desired operation
}
```
By checking if the "code" variable is null before invoking the `equalsIgnoreCase()` method, you can prevent the error from occurring.