Search String in an arrayed text file

Question

I took a text file and put it in one array. However, I want to search for a String (word) within the array. In my case I wanted to use the scanner to get input from the user, then search for a string match in the array. How can one achieve such a task?

public static void main(String[]args) throws IOException
{
    //Scanner scan = new Scanner(System.in);
    //String stringSearch = scan.nextLine();
    List<String> words = new ArrayList<String>();
    BufferedReader reader = new BufferedReader(new FileReader("File1.txt"));
    String line;
    while ((line = reader.readLine()) != null) {
                    words.add(line);        
        }
        reader.close();
        System.out.println(words);
}

My output:

[CHAPTER I. Down the Rabbit-Hole, Alice was beginning to get very tired of sitting by her sister on the, bank, and of having nothing to do:]

beder · Accepted Answer · 2013-01-08 15:47:17Z

1

You can use the .contains() function from List. It will use the .equals() method of the parameter on each element

words.contains("your_string")

Just realized you are saving one line per index, and not one word. In this case:

for(String sLine : words) {
    if (sLine.contains("your_string")) {
         System.out.println("Got a match");
         break;
     }
 }

edited Jan 8, 2013 at 15:47

answered Jan 8, 2013 at 15:41

beder

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Comments

pidel · Accepted Answer · 2013-01-08 15:42:02Z

1

for(int i = 0; i < words.size(); i++){
  if(words.get(i).equals(string)){
     found!!
  }
}

edited Jan 8, 2013 at 15:42

answered Jan 8, 2013 at 15:39

pidel

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1 Comment

Sri Harsha Chilakapati Over a year ago

He's adding the total lines without splitting. Use String.contains instead

matsev · Accepted Answer · 2013-01-08 15:41:55Z

0

The equals() method suggested by others will only work if you have one word per line. Try iterating over the list and see if one (or more) of the strings contains(word) the word you are looking for?

answered Jan 8, 2013 at 15:41

matsev

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Comments

Cup O Noodles · Accepted Answer · 2013-01-08 15:45:54Z

0

You can do something with the scanner like this

Scanner sc = new Scanner(new File("File1.txt"));
String targetString = "whatYouWant";
String testString = sc.next();
while(sc.hasNext())
{
    if(testString.equals(targetString))
        hooray!
}

This isn't a full solution but hopefully this will guide you to a working solution.

answered Jan 8, 2013 at 15:45

Cup O Noodles

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