Hash.java

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

class Hash {
    public static void main(String[] args) throws NoSuchAlgorithmException {
        String message = "Hello World";
        Hash hash = new Hash();
        System.out.println("MD5: " + hash.getMD5(message));
        System.out.println("SHA-1: " + hash.getSHA1(message));
        System.out.println("SHA-256: " + hash.getSHA256(message));
        System.out.println("SHA-512: " + hash.getSHA512(message));
    }
    
    private String getHash(String message, String algorithm) throws NoSuchAlgorithmException {
        MessageDigest hash = MessageDigest.getInstance(algorithm);
        hash.update(message.getBytes());
        byte[] digest = hash.digest();
        BigInteger bigInt = new BigInteger(1, digest);
        return bigInt.toString(16);
    }

    public String getMD5(String message) throws NoSuchAlgorithmException {
        return getHash(message, "MD5");
    }

    public String getSHA1(String message) throws NoSuchAlgorithmException {
        return getHash(message, "SHA-1");
    }

    public String getSHA256(String message) throws NoSuchAlgorithmException {
        return getHash(message, "SHA-256");
    }

    public String getSHA512(String message) throws NoSuchAlgorithmException {
        return getHash(message, "SHA-512");
    }
}