需要按字母顺序排列文本文件中的单词

Question

I have a text file full of words that I need to arrange into alphabetical order. What are the steps I should take to do this. I know I need to use an array but then put them in order and print it but I'm not sure of the exact details. Also I dont know how to read each individual string becuase I only know .nextLine which takes all the strings in a line.

Been working on this for a while and not making much progress any help would be greatly appreciated.

Answer 1

You need to create a "global" list (not an array since you don't know the length) to hold the words and then read each line. Split each line into an array of words and then add them to this global list. Then sort this list.

Here is an example of a basic implementation of this:

Scanner scanner = new Scanner(file);
ArrayList<String> allWords = new ArrayList();
while (scanner.hasNextLine()) {
   String line = scanner.nextLine();
   String[] words = line.split(" ");
   List<String> wordList = Arrays.asList(words)
   allWords.addAll(wordList);             
}
scanner.close();
Collections.sort(allWords);

Note that I wrote this freehand so there may be syntax or even logic errors. Hopefully it gives you the basic road ahead though. Also, I didn't handle exceptions.

Hope this helps. Please ask more questions, and good luck with your Java learning!