Why bufferedinputstream in java

The below example illustrates the working of the skip method in the Java BufferedInputStream class. Based on the number passed as a parameter in the skip method, it discards that many numbers of bytes to read. Here, we discard the first 4 bytes of data to read and continue reading the remaining bytes using the read method. Table of Contents. See also. Creates a BufferedInputStream with a specified size and stores the 'is' parameter stream for later use.

Discrete Mathematics. Ethical Hacking. Computer Graphics. Software Engineering. Web Technology. Cyber Security. C Programming. Control System. Data Mining. Data Warehouse. I also assume that using a for loop to constantly call read from the FileInputStream is what you mean by lots of small reads?

I sorry to sound so noobish, but I am having a hard time completely grasping this for some reason. Thanks for your answer! If you are reading through your byte[] byte by byte then you will probably find using a BufferedInputStream or ByteArrayInputStream simplifies your code at some performance cost.

Note don't mix using BufferedInputStream with using the underlying stream, because the former buffers. Jubal Jubal 7, 4 4 gold badges 27 27 silver badges 29 29 bronze badges. Thanks for the suggestions. I heard someone mention the profilier in NetBeans. I started using NetBeans, however, I have switched to using just a plain text editor for the time being. I feel that I learn more about the language that way. Do you have any other suggestions? Text editors are great, but it's kind of like pedaling a dump truck if you're billing clients.

You might try hprof if you want to avoid doing the profiling in an ide: java. Thanks jskaggz. I will check out hprof. BTW, I am making this application for myself, so I am not really on a timetable, but I agree that if it were for a client, I would definitely use an ide to speed it along. When you use the BufferedInputStream, do you usually specify a particular size chunk for it to buffer, or do you let it automatically decide?

This depends. As Stephen C said above, if this number doesn't coincide well with the data page size used in the syscalls say 4k then you just shot yourself in the foot by creating a bottleneck. Think of it like filling a sandbag with a shovel. Just a side note that I am an advocate of writing good code. But if you are just starting out, there is nothing wrong with getting it to work and then optimizing later. These things can be rabbit holes. JasonMcCreary When to use read byte by byte and when to use read byte[] array of byte.

This creates a BufferedInputStream with the specified buffer size, and saves its argument, the input stream in, for later use. This method returns an estimate of the number of bytes that can be read or skipped over from this input stream without blocking by the next invocation of a method for this input stream.

This method closes this input stream and releases any system resources associated with the stream.