java - Java電話番号ワードジェネレーターで立ち往生

Question

7 桁の電話番号から可能なすべての単語を生成し、PrintWriter を使用してそれを .txt ファイルとして保存する割り当てがあります。私のコードは以下のとおりですが、私の出力 (現在はコンソールに出力するだけです) は同じ 3 つの「単語」で 2187 回です。

package ks2_Lab19;

import java.util.Scanner;
import java.io.PrintWriter;
import java.io.FileNotFoundException;

public class WordGenerator {

private static String[] two = {"a", "b", "c"};
private static String[] three = {"d", "e", "f"};
private static String[] four = {"g", "h", "i"};
private static String[] five = {"j", "k", "l"};
private static String[] six = {"m", "n", "o"};
private static String[] seven = {"p", "r", "s"};
private static String[] eight = {"t", "u", "v"};
private static String[] nine = {"w", "x", "y"};
private static char[] numArray;
private static String[] wordList = new String[2187];

public static void convert(char[] input){
    for (int i = 0; i < 2184; i = i + 3){
        for (int a = 0; a < 7; a++){
            for (int b = 0; b < 3; b++){
                if (input[a] == '1' || input[a] == '0') {
                    wordList[i+b] = wordList[i+b] + " "; 
                }//if 0 or 1
                if (input[a] == '2'){
                    wordList[i+b] = wordList[i+b] + two[b];
                }//if 2
                if (input[a] == '3'){
                    wordList[i+b] = wordList[i+b] + three[b];
                }//if 3
                if (input[a] == '4'){
                    wordList[i+b] = wordList[i+b] + four[b];
                }//if 4
                if (input[a] == '5'){
                    wordList[i+b] = wordList[i+b] + five[b];
                }//if 5
                if (input[a] == '6'){
                    wordList[i+b] = wordList[i+b] + six[b];
                }//if 6
                if (input[a] == '7'){
                    wordList[i+b] = wordList[i+b] + seven[b];
                }//if 7
                if (input[a] == '8'){
                    wordList[i+b] = wordList[i+b] + eight[b];
                }//if 8
                if (input[a] == '9'){
                    wordList[i+b] = wordList[i+b] + nine[b];
                }//if 9
            }//possible output for loop
        }//input array for loop
    }//write to wordList for loop
}

public static void main(String[] args) {

    //initialize output file name and PrintWriter object
    String fileName = "output.txt";
    PrintWriter outputStream = null;
    String output = "";

    //try and catch exception
    try {
        outputStream = new PrintWriter(fileName);
    }
    catch (FileNotFoundException e){
        System.out.println("Error opening file " + fileName + ".");
        System.exit(0);
    }

    //initialize scanner and wordList array
    Scanner kb = new Scanner(System.in);
    for (int i=0; i < 2187; i++){
        wordList[i] = "";
    }

    //announce and accept input
    System.out.println("Please input a 7 digit phone number without special characters.");
    String num = kb.next();
    numArray = num.toCharArray();
    convert(numArray);
    for (int p = 0; p < 2187; p++){
        System.out.println(wordList[p]);
    }
}

}