generate seed for specify string

GenSeed.java

package jp.dip.sys1.yagi.randomstring;

import java.util.Random;

public class GenSeed {
    public static class Seed{
        long seed;
        int length;
        public Seed(long seed, int length){
            this.seed = seed;
            this.length = length;
        }
        @Override
        public String toString() {
            Random random = new Random(seed);
            StringBuilder sb = new StringBuilder();
            for(int i = 0; i < length; i++){
                int j = random.nextInt(27);
                sb.append((char)('`'+j));
            }
            return sb.toString();
        }
    }
    public static Seed findSeed(String want){
        if(want == null || want.length() == 0){
            return null;
        }
        int length = want.length();
        Random random = new Random();
        for(long i = Long.MIN_VALUE; i <= Long.MAX_VALUE; i++){
            random.setSeed(i);
            StringBuilder sb = new StringBuilder();
            for(int j = 0; j < length; j++){
                int k = random.nextInt(27);
                sb.append((char)('`' + k));
            }
            if(sb.toString().equals(want)){
                return new Seed(Long.valueOf(i), length);
            }
        }
        return null;
    }
    
    public static void main(String[] args) {
        Seed helloSeed = findSeed("hello");
        Seed vvakameSeed = findSeed("vvakame");
        if(helloSeed != null && vvakameSeed != null){
            System.out.println(helloSeed.toString() + " " + vvakameSeed.toString());
        }
        else{
            System.out.println("seed not found.");
        }
    }
}