CalculateChecksumForTwoStrings.java

public class App {
	public static void main(String[] args) {

		String string1 = "string1";
		String string2 = "string2";

		String checksum = DigestUtils
				.sha1Hex(String.valueOf((string1.length() + DigestUtils.md5Hex(string2).length())));

		System.out.println("string1 = " + string1);
		System.out.println("string2 = " + string2);
		System.out.println("checksum = " + checksum);
	}
}