How Can I Efficiently Read a File into an ArrayList in Java?

Efficiently Reading File Contents into an ArrayList in Java

Reading the contents of a file into an ArrayList in Java can be a useful task for handling text-based data. To achieve this, we can utilize the Scanner class.

Reading Data Word by Word:

To read the file contents word by word, the following code snippet can be employed:

Scanner s = new Scanner(new File("filepath"));
ArrayList<String> list = new ArrayList<>();
while (s.hasNext()){
    list.add(s.next());
}
s.close();

Reading Data Line by Line:

If you wish to read the file contents line by line, simply modify the Scanner methods as follows:

s.hasNextLine()
s.nextLine()

With this approach, each line of the file will be added as an element to the ArrayList.

Example:

Consider a file with the following contents:

cat
house
dog

The above code will populate the ArrayList with the strings:

["cat", "house", "dog"]

Note:

Remember to close the Scanner object using s.close() to release system resources once you have finished reading the file.

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