How to store multiple lines from file into String from Scanner `

Question

Using Scanner, i'm not sure how to read a file with multiple lines and store it all into a String. I use a loop like :

while(file.hasNext())
{
    string += file.nextLine();
}

I find that the file.hasNext method eats up all of the data in the file and so file.nextInt() doesn't have any values to find and so it returns and error. What can I do to "reset" the Scanner? I tried creating a new Scanner object but that didn't change anything. I have to run this string through a method and I have run into this problem many times. What should I do?

Scanner#hasNext() doesn't eat anything, please post a mcve This smells like stackoverflow.com/questions/13102045/… — user180100
– user180100, Commented Mar 25, 2016 at 15:54

Jakub S. · Accepted Answer · 2016-03-25 16:11:26Z

1

Maybe you should try StringBuilder.

StringBuilder builder = new StringBuilder();
try (BufferedReader br = new BufferedReader(new FileReader(file))) {
    String line;
    while ((line = br.readLine()) != null) {
    builder.append(line);
    // process the line.
    }
}

later

String text = builder.toString();

edited Mar 25, 2016 at 16:11

answered Mar 25, 2016 at 15:56

Jakub S.

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Comments

VGR · Accepted Answer · 2016-03-25 20:38:52Z

0

To read the entire contents of a Scanner source into a String, set the Scanner's delimiter to the end of the file:

String contents = file.useDelimiter("\\Z").next();

answered Mar 25, 2016 at 20:38

VGR

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