public static void main(String[] args) throws IOException {
System.out.println("Input Stream:");
long start = System.currentTimeMillis();
Path filename = Paths.get(args[0]);
long crcValue = checksumInputStream(filename);
long end = System.currentTimeMillis();
System.out.println(Long.toHexString(crcValue));
System.out.println((end - start) + " milliseconds");
System.out.println("Buffered Input Stream:");
start = System.currentTimeMillis();
crcValue = checksumBufferedInputStream(filename);
end = System.currentTimeMillis();
System.out.println(Long.toHexString(crcValue));
System.out.println((end - start) + " milliseconds");
System.out.println("Random Access File:");
start = System.currentTimeMillis();
crcValue = checksumRandomAccessFile(filename);
end = System.currentTimeMillis();
System.out.println(Long.toHexString(crcValue));
System.out.println((end - start) + " milliseconds");
System.out.println("Mapped File:");
start = System.currentTimeMillis();
crcValue = checksumMappedFile(filename);
end = System.currentTimeMillis();
System.out.println(Long.toHexString(crcValue));
System.out.println((end - start) + " milliseconds");
}
public static String calculateCrc32(String source) {
CRC32 crc32 = new CRC32();
Adler32 adler32 = new Adler32();
adler32.update(source.getBytes());
System.out.println(adler32.getValue());
crc32.update(source.getBytes());
StringBuilder builder = new StringBuilder(8);
System.out.println(crc32.getValue());
System.out.println(Long.toHexString(crc32.getValue()));
builder.append(Long.toHexString(crc32.getValue()));
if (builder.length() < 8) {
builder.append(CHAR_TEMPLATE, 0, 8 - builder.length());
}
System.out.println(builder.toString());
return builder.toString();
}