How do I populate JComboBox from a text file?

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Very vague question. Are you saying you want one entry per line? If so you want to use something like a BufferedReader, read all the lines, save them as a String array. Create a new JComboBox passing in that String constructor.

BufferedReader input = new BufferedReader(new FileReader(filePath));
List<String> strings = new ArrayList<String>();
try {
  String line = null;
  while (( line = input.readLine()) != null){
    strings.add(line);
  }
}

catch (FileNotFoundException e) {
    System.err.println("Error, file " + filePath + " didn't exist.");
}
finally {
    input.close();
}

String[] lineArray = strings.toArray(new String[]{});

JComboBox comboBox = new JComboBox(lineArray);

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