My Bug List

Here, I collect code bugs that I have made, so hope I can avoid to make same mistake again in future.

It's important to write correct code at first version when write code - especially during interview.

1. Forget to initialize variables: collection - especially instance or static variable.
-- Init variables when declare them.

2. ! nor 
while (!queue.isEmpty())

Make sure no forever loop: while will exit

remove items from collection in for loop
Use wrong variable
    public void concatRegexSrcField(SolrDocument doc, String srcPatternField,
        StringBuilder sb) {
      Pattern pattern = Pattern.compile(srcPatternField);
      for (String docField : doc.getFieldNames()) {
        Matcher matcher = pattern.matcher(docField);
        if (matcher.matches()) {
          // srcPatternField is previous called srcField, and I use srcField here, which I should really use srcPatternField
doConcat(doc, sb, doc.getFieldValue(srcField));
          if (removeSrcFileds) {
            doc.removeFields(docField); // remove items from collection in for loop, I should use iterator
          }
        }
      }
    }