안녕하세요

XHAENEUNG 를 자바 버전으로 풀려고 하는데 자꾸 오답되네요
문제 자체는 그리 어려운 것 같지 않아서 뭔가 문제에 대한 이해가 안된것인지 고민입니다..
제가 쓴 코드입니다.
문제에 대한 이해가 안된것인지 아니면 로직이 잘못된 곳이 있는 것인지요..
***java 로쓴 코드 ***

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.StringTokenizer;

public class Main {

private static class AlphabetLength implements Comparable<AlphabetLength>{
    private Character alphabet;
    private int alphabetLength;

    public AlphabetLength(Character alphabet) {
        this.alphabet = alphabet;
        this.alphabetLength = 1;
    }

    public void addAlphabetCount() {
        this.alphabetLength++;
    }

    @Override
    public int compareTo(AlphabetLength o) {
        int alphabetCompareResult = this.alphabet.compareTo(o.alphabet);
        if (alphabetCompareResult == 0) {
            return new Integer(this.alphabetLength).compareTo(o.alphabetLength);
        }
        return alphabetCompareResult;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result
                + ((alphabet == null) ? 0 : alphabet.hashCode());
        result = prime * result + alphabetLength;
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        AlphabetLength other = (AlphabetLength) obj;
        if (alphabet == null) {
            if (other.alphabet != null)
                return false;
        } else if (!alphabet.equals(other.alphabet))
            return false;
        if (alphabetLength != other.alphabetLength)
            return false;
        return true;
    }
}
private static class AlphabetLengthFactory {
    private AlphabetLengthFactory() {
    }
    public static AlphabetLength[] getAlphabetLength(String numberString) {
        if (numberString == null) {
            return null;
        }
        List<AlphabetLength> alphabetLengthList = new ArrayList<AlphabetLength>();
        char ch;
        int alphabetLengthIndex;
        for (int i=0; i<numberString.length(); i++) {
            ch = numberString.charAt(i);
            alphabetLengthIndex = alphabetLengthList.indexOf(ch);
            if (alphabetLengthIndex > -1) {
                alphabetLengthList.get(alphabetLengthIndex).addAlphabetCount();
            } else {
                alphabetLengthList.add(new AlphabetLength(ch));
            }
        }
        return alphabetLengthList.toArray(new AlphabetLength[0]);
    }
}
private static enum Number {
    zero(0), one(1), two(2), three(3), four(4), five(5), six(6), seven(7), eight(8), nine(9), ten(10), outofrangenumber(-1, true);
    private AlphabetLength[] alphabetLengthArray;
    private int intValue;
    private boolean outofrangeFlag;
    private Number(int intValue) {
        this(intValue, false);
    }
    private Number(int intValue, boolean outofrangeFlag) {
        this.intValue = intValue;
        this.alphabetLengthArray = AlphabetLengthFactory.getAlphabetLength(this.name());
        Arrays.sort(this.alphabetLengthArray);
    }
    public boolean isOutofRange() {
        return this.outofrangeFlag;
    }
    public Number operate(String operatorString, Number otherOperand) {
        int result = -1;
        if (operatorString.equals("+")) {
            result = this.intValue + otherOperand.intValue;
        } else if (operatorString.equals("-")) {
            result = this.intValue - otherOperand.intValue;
        } else if (operatorString.equals("*")) {
            result = this.intValue * otherOperand.intValue;
        }
        if (result < 0 || result > 10) {
            return outofrangenumber;
        }
        return Number.values()[result];
    }
    public boolean equalsNumber(Number otherNumber) {
        return !isOutofRange() && !otherNumber.isOutofRange() && this.intValue == otherNumber.intValue;
    }
    public static Number valueOfNumberString(String numberString) {
        if (numberString == null) {
            return Number.outofrangenumber;
        }
        AlphabetLength[] otherAlphabetLengthArray = AlphabetLengthFactory.getAlphabetLength(numberString);
        for (Number number : Number.values()) {
            if (equalsAlphabetLength(number, numberString) && equalsIgnoreOrder(number, otherAlphabetLengthArray)) {
                return number;
            }
        }
        return Number.outofrangenumber;
    }
    private static boolean equalsIgnoreOrder(Number sourceNumber, AlphabetLength[] otherAlphabetLengthArray) {
        Arrays.sort(otherAlphabetLengthArray);
        return Arrays.equals(sourceNumber.alphabetLengthArray, otherAlphabetLengthArray);
    }
    private static boolean equalsAlphabetLength(Number sourceNumber, String numberString) {
        return sourceNumber.name().length() == numberString.length();
    }
}

public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    int testcase = Integer.valueOf(sc.nextLine());
    StringTokenizer st;
    Number leftOperand;
    String operator;
    Number rightOperand;
    Number answer;
    Number correctAnswer;
    while (0<testcase--) {
        st = new StringTokenizer(sc.nextLine(), " ");
        leftOperand = Number.valueOf(st.nextToken());
        operator = st.nextToken();
        rightOperand = Number.valueOf(st.nextToken());
        st.nextToken();// =
        answer = Number.valueOfNumberString(st.nextToken());
        correctAnswer = leftOperand.operate(operator, rightOperand);
        if (!answer.isOutofRange() && !correctAnswer.isOutofRange() && answer.equalsNumber(correctAnswer)) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
}

}