Problem with inifnito loop Randomaccessfile

Question

I am using this code to read a text file using the RandomAccessFile, character by character, and generating a string for each word formed, to save to a Hashmap. I need to use the RandomAccessFile because I need to know the position of the word in the file, so I saved in my Record type this value offset = arq.getFilePointer()

The problem is that when I do the check on while(arq.read() != -1) the file pointer advances a position, so that I always lose the first letter of my word. If I try to give a arq.seek() in the previous position, I even picked up the first letter again, but the program is in an infinite loop.

Is there any other way to control when the file reaches the end without using the arq.read()?

try {
RandomAccessFile arq = new RandomAccessFile("teste.txt", "r"); 
  try{ 
    while(arq.read() != -1) {
     String palavra = "";
     offset = arq.getFilePointer();
     letra = (char)arq.read(); 
        while (letra != ' ' && letra != '\n') {
          palavra += letra;
          letra = (char)arq.read();
        }
          palavra = palavra.toLowerCase();
          System.out.println(palavra); 
             if (h.PesquisaRegistro(palavra) == null) { 
                x = new Registro(palavra, offset);
                h.Inserir(x, h.HashCode(x));
             } else {
                x = h.PesquisaRegistro(palavra);
                x.quantidade++;
                h.tabela.replace(h.PesquisaChave(palavra), x);
             }
     }       
   }catch(EOFException ex){
   }       
} catch (IOException e) {
}

Answer 1

You could set a variable before the while and store the return of the first read in it.

---

With while:

RandomAccessFile arq = new RandomAccessFile("teste.txt", "r");
int letraByte = arq.read();
while (letraByte != -1){
    String palavra = "";

    while ((char) letraByte != ' ' && (char) letraByte != '\n' && letraByte != -1) {
        palavra += (char) letraByte;
        letraByte = arq.read();
    }

    letraByte = arq.read();
    System.out.println(palavra);
}

---

With while:

RandomAccessFile arq = new RandomAccessFile("teste.txt", "r");
int letraByte;
do {
    String palavra = "";
    letraByte = arq.read();

    while ((char) letraByte != ' ' && (char) letraByte != '\n' && letraByte != -1) {
        palavra += (char) letraByte;
        letraByte = arq.read();
    }
    System.out.println(palavra);
} while (letraByte != -1);

Answer 2

You can simply call Arq.read() before and at the end of while and put the value into a variable and test this variable. So you can read the value after without walking the file pointer.