我正在做一个项目，我的代码不工作不知道为什么。给定测试程序和通用类，我需要一个满足以下逻辑正则表达式的程序：
l1：对于字母表{a，b}，所有包含奇数个a和一个b的字符串。
测试输入：AAAAAAA，AAAAAAA，AAAAAAAB，AAAAA，AAAAA
应该是什么：
AAAAA错误
AAAAAAA真的
aabaaab假
Baaaaa假
AAAAAA真的
程序输出：（真、真、真、假、真）
我的测试程序：

import java.util.Scanner;
// Test Finite State Machine Class
public class TestFSML1
{
  public static void main(String[] args){
    String A = "ab";
    int[][] ST = {{1,3,0},
            {1,2,1},
            {2,2,2},
            {3,3,3}};
    int[] AS = {0,0,1,0};
    Scanner in = new Scanner(System.in);
    String inString;
    boolean accept1 = false;
    FSM FSM1 = new FSM(A, ST, AS);
// Input string is command line parameter
    System.out.println("     Input       Accepted:");
    for(int i=0;i<args.length;i++) {
      inString = args[i];
      accept1 = FSM1.validString(inString);
      System.out.printf("%10s%13s\n",inString, accept1);
    }
  } // end main
} // end class

fsm类

// Finite State Machine Class
public class FSM
{
  // Instance variables
  public  String alphabet;
  public  int    stateTrans[][];
  public  int    acceptState[];
  private int    cstate;
  // Constructor function
  public FSM(String A, int[][] ST, int[] AS)
  {
    int NSYMBOLS = A.length();
    int NSTATES  = AS.length;
    // Alphabet
    alphabet = "" + A;
    // State transition table
    stateTrans = new int[NSTATES][NSYMBOLS];
    for(int r = 0; r < NSTATES; r++)
      for(int c = 0; c < NSYMBOLS; c++)
        stateTrans[r][c] = ST[r][c];
    // Accept states
    acceptState = new int[NSTATES];
    for(int r = 0; r < NSTATES; r++)
      acceptState[r] = AS[r];
    // Start state
    cstate = 0;
  } 
  // Methods
  public int getState()
  {
    return cstate;
  }
  public void setState(int state)
  {
    cstate = state;
    return;
  }
  public int nextState(char symbol)
  {
    int nstate = -1;
    int col = alphabet.indexOf(symbol);
    if(col >= 0)
      nstate = stateTrans[cstate][col];
    return nstate;
  }
  public boolean accept(int state)
  {
    if(state < 0)
      return false;
    return (acceptState[state] != 0);
  }
  public boolean validString(String word)
  {
    cstate = 0;
    for(int k = 0; k < word.length(); k++){
      cstate = nextState(word.charAt(k));
      System.out.print(cstate);
      System.out.println("  " + word.charAt(k));
      if(cstate < 0)
        return false;
    }
    return accept(cstate);
  }
} // end class

谢谢！