gistfile1.java

private static final String[] = {"a", "b", "c"};

public String toDelimitedString(Model record) {
  StringBuilder b = new StringBuilder();
  
  // Add n-1 fields with delim
  for (int i=0; i<fields.length-1; i++) { // With guava or commons colls could use iter here
    b.append(record.get(fields[i]));
    b.append(delim);
  }
  
  // Add last field with newline
  b.append(record.get(fields[fields.length-1])).append('\n');
  
  return b.toString();
}