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ReadBytes.java

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package io;

import java.io.*;

import java.util.Arrays;

public class ReadBytes {

InputStream in;

int bytesToRead;

byte[] byteArray;

public ReadBytes(InputStream in, int numBytes) {

this.in = in;

bytesToRead = numBytes;

byteArray = new byte[bytesToRead];

try {

go();

} catch (IOException e) {

e.printStackTrace();

}

}

public byte[] getByteArray(){

return byteArray;

}

public void go() throws IOException {

int bytesRead = 0;

int bytesAvailable = 0;

while (bytesRead < bytesToRead && bytesAvailable != -1) {

bytesAvailable = in

.read(byteArray, bytesRead, bytesToRead - bytesRead);

bytesRead += bytesAvailable;

}

}

public static void main(String[] args) {

InputStream in = System.in;

int numBytesToRead = 32;

ReadBytes rb = new ReadBytes(in, numBytesToRead);

byte[] byteArray = rb.getByteArray();

System.out.println(byteArray.length + " bytes read");

System.out.println(Arrays.toString(byteArray));

}

}