java生成hash值的方法是什么

?Java?,??????????hash?:

1. ??MessageDigest?:MessageDigest??????????,?MD5?SHA-1?SHA-256????????getInstance("???")????????MessageDigest??,????update()?????????????,????digest()???????????????:

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class HashGenerator {

    public static void main(String[] args) {
        String input = "Hello World";

        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] hashBytes = md.digest(input.getBytes());

            // ?????????????
            StringBuilder sb = new StringBuilder();
            for (byte b : hashBytes) {
                sb.append(String.format("x", b));
            }
            String hash = sb.toString();

            System.out.println("MD5 hash: " + hash);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }
}

2. ??HashCode??:Object???hashCode()????????????,????????????????????:

String input = "Hello World";
int hash = input.hashCode();
System.out.println("Hash code: " + hash);

??????,hashCode()??????int??????,??????????????,????Objects??hashCode()???