Detailed explanation of file operation of Java I / O Technology

In Java programming, I / O operation is through Java IO package, so the first step is to import this package.

java. IO provides a file class, which is easily misunderstood. It represents a file name or directory name rather than the file itself, so it is impossible to operate the data in the file through this class. The file class provides a series of functions for file operations: deleting files, creating directories, querying file sizes, and so on. If you want to operate on file data, you need a stream object. I won't introduce it here for the time being.

The following uses a class called fileextension to encapsulate various operations in the file class. Through this example, I hope you can use the file class well. Here I only provide the implementation of deletefile. This example is quoted from the Java instance technical manual.

The implementation of deletefile is as follows:

If you look at the above example in detail, you will find that Java's packaging of file makes it very easy for us to use. If you are interested, you can add some functions, such as createdir, listdir, filesize and so on, which will be helpful to you.