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ByteArrayOutputStream Demo

import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; public class ByteArrayIOApp {   public static void main(String args[]) throws IOException {     ByteArrayOutputStream outStream = new ByteArrayOutputStream();     String s = "This is a test.";     for (int i = 0; i < s.length(); ++i)       outStream.write(s.charAt(i));     System.out.println("outstream: " + outStream);     System.out.println("size: " + outStream.size());     ByteArrayInputStream inStream;     inStream = new ByteArrayInputStream(outStream.toByteArray());     int inBytes = inStream.available();     System.out.println("inStream has " + inBytes + " available bytes");     byte inBuf[] = new byte[inBytes];     int bytesRead = inStream.read(inBuf, 0, inBytes);     System.out.println(bytesRead + " bytes were read");     System.out.println("They are: " + new String(inBuf));   } }