code: public void addString(String str) {
          if (mSize == mStrings.length) {
              String[] old = mStrings;
              int oldSize = old.length;
              mStrings = new String[oldSize + (oldSize << 1)];
              System.arraycopy(old, 0, mStrings, 0, oldSize);
          }
          mStrings[mSize++] = str;
      }
docs: /*
  /////////////////////////////////////////////////////
  Mutators:
  /////////////////////////////////////////////////////