Method that will read all words from a source file and properly update the list

I am trying to create a boolean method that will read all the words from a source file. I have a hit a roadblock. All suggestions and tips are greatly appreciated! Here is my unfinished code:

public class WordCloud {
ArrayList<WordPair> list;
public WordCloud() {
  list = new ArrayList<WordPair>();
}
public boolean getWordsFromFile (String filename) throws IOException {
    File sourceFile = new File (filename);
    Scanner input = new Scanner (sourceFile);
    String allText = "";
    while (input.hasNext())
    {
    if (input.next){
       String allText = input.next();
       list.add(allText);
       }
       return true;
       }
       }