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Chapter 4: Problem 23

What clause must you write in the header of a method that performs a file operation?

Short Answer

Expert verified
Answer: The "throws" clause followed by the specific exception type (e.g., IOException or FileNotFoundException) must be included in the method header to handle potential exceptions during file operations.

Step by step solution

01

Understanding file operations and exceptions

File operations, such as reading or writing data to the storage, hold the potential of causing exceptions, like FileNotFoundException or IOException. An exception occurs when there is an error during the execution of the program. In Java, it's necessary to handle these exceptions using either try-catch blocks or by declaring the exceptions in the method header using a "throws" clause.
02

Adding the specific clause to the method header

Since the exercise is asking for the clause to add, the proper action is to include a "throws" statement followed by the specific exception type in the method declaration. For file operations, it is common to use IOException, which represents a general input/output exception or a more specific exception if it is known, like FileNotFoundException.
03

Example of a method that performs a file operation

Here's an example of a method header that reads a file and includes the required clause to handle the exception: ```java public void readFile(String filePath) throws IOException { // code to read the file } ``` In this example, the method "readFile" takes a file path string as input and throws an IOException to indicate that any errors during file operations will be handled by the calling code (either through try-catch blocks or through another method that also uses "throws").

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