java.lang.String cannot be cast to java.lang.Integer
时间: 2023-09-27 07:08:30 浏览: 56
This error occurs when you try to treat a String object as an Integer object, but they are not compatible data types. In other words, you are trying to cast (convert) a String to an Integer, but the String does not contain a valid integer value.
For example, if you try to execute the following code:
```
String str = "123";
Integer num = (Integer) str;
```
You will get the "java.lang.String cannot be cast to java.lang.Integer" error because you are trying to cast a String to an Integer.
To fix this error, you can use the Integer.parseInt() method to convert the String to an Integer:
```
String str = "123";
Integer num = Integer.parseInt(str);
```
This will convert the String "123" to the Integer value of 123.
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