Checksum of a Byte Array in Java

import java.util.zip.Adler32;
import java.util.zip.Checksum;
public class Demo {
	public static void main(String[] argv) throws Exception {
		byte[] arr = "This is it!".getBytes();
		Checksum checksum = new Adler32();
		checksum.update(arr, 0, arr.length);
		long res = checksum.getValue();
		System.out.println("Checksum of a Byte array = "+res);
	}
}