Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
	Unhandled exception type BusinessException

	at cn.edu.zucc.booklib.control.BookLendManager.loadReaderLendCount(BookLendManager.java:450)
	at cn.edu.zucc.booklib.control.BookLendManager.main(BookLendManager.java:468)

The error you're encountering is due to the `BusinessException` not being handled in your Java code. To fix this, you need to either handle the `BusinessException` with a try-catch block or declare that your method throws this exception.

Here are the two possible solutions:

### Solution 1: Handle with Try-Catch Block
Add a try-catch block around the code that throws the `BusinessException`.

```java
try {
    // Code that might throw BusinessException
    BookLendManager.loadReaderLendCount();
} catch (BusinessException e) {
    // Handle the exception
    e.printStackTrace();
}
```

### Solution 2: Declare the Exception in Method Signature
Add `throws BusinessException` to the method signature where the exception can be thrown.

```java
public static void main(String[] args) throws BusinessException {
    BookLendManager.loadReaderLendCount();
}
```

### Example with Try-Catch Block
Assuming `loadReaderLendCount` is the method causing the issue, you would modify your `main` method like this:

```java
public static void main(String[] args) {
    try {
        BookLendManager.loadReaderLendCount();
    } catch (BusinessException e) {
        e.printStackTrace();
    }
}
```

### Example with Throws Declaration
Alternatively, you could modify the `main` method signature:

```java
public static void main(String[] args) throws BusinessException {
    BookLendManager.loadReaderLendCount();
}
```

### Summary
You need to choose the approach based on your specific requirements. If the `BusinessException` is something that should be handled immediately within the method, use the try-catch block. If the method is part of a larger application where the exception should be propagated to a higher level, use the throws declaration.

Would you like more details on handling exceptions or have any other questions? Here are five questions you might want to ask:

1. How can I create custom exceptions in Java?
2. What are the best practices for exception handling in Java?
3. How do checked and unchecked exceptions differ in Java?
4. How can I log exceptions in Java applications?
5. What are the different types of exceptions in Java?

**Tip:** Always ensure that your exception handling is meaningful and provides enough information to understand the error and take corrective actions.

Understand and resolve the Java error 'Unhandled exception type BusinessException' in BookLendManager.java. Learn two solutions: handle with try-catch block or declare exception in method signature.

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