{
String str = "jino630";
byte[] bytes = str.getBytes(StandardCharsets.UTF_8);
CRC32 crc32 = new CRC32();
crc32.update(bytes);
long checksum1 = crc32.getValue();
String str2 = "HelloWorld";
byte[] bytes2 = str2.getBytes(StandardCharsets.UTF_8);
crc32.reset();
crc32.update(bytes2);
long checksum2 = crc32.getValue();
assert (checksum1 != checksum2);
String str3 = "jino630";
byte[] bytes3 = str3.getBytes(StandardCharsets.UTF_8);
crc32.reset();
crc32.update(bytes3);
long checksum3 = crc32.getValue();
assert (checksum1 == checksum3);
}