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Bil Lewis

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Three loops that all do the same thing

February 10, 2009

Here are three loops that all do the same thing. (Assuming I haven't
made a silly mistake.:-) A clever compiler might even compile them
down to identical instructions. So which version do you like best and
why?

I'll tell you my opinions next week. I'd like to hear yours this week.
 
 public static final String readStringDO(Reader reader) throws IOException {
    char buf[] = new char[4096];
    StringBuffer result = new StringBuffer();
    int size = 0;

    do {
       size = reader.read(buf);
       if (size != -1)
          result.append(buf, 0, size);
       } while (size != -1);

     return result.toString();
 }


 
 public static final String readStringWHILE(Reader reader) throws IOException {
    char buf[] = new char[4096];
    StringBuffer result = new StringBuffer();

    while (true) {
          int size = reader.read(buf);
          if (size == -1)
              return result.toString(); 
          result.append(buf, 0, size);
       }      
 }


 
 public static final String readStringFOR(Reader reader) throws IOException {
    char buf[] = new char[4096];
    StringBuffer result = new StringBuffer();

    for (int size = reader.read(buf); size != -1; size = reader.read(buf)) {
          result.append(buf, 0, size);
       }      

    return result.toString(); 
 }

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