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Tip of the Day
Language: Java
Expertise: Intermediate
Nov 20, 2017

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Reducing Unbuffered Streams

InputStream in = new FileInputStream(file);
int q;
while ((q = in.read()) != -1) {
     ...
}

The code above reads a file byte by byte. Every read() method call on the stream causes a native call to native implementation of the filesystem. Depending on the implementation this may cause a syscall to the operating system. The number of native calls can be reduced significantly by wrapping the stream into a BufferedInputStream:

InputStream in = new BufferedInputStream(new FileInputStream(file));
Octavia Anghel
 
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