CODEWITHSUNDEEP
java
Ty Givens
Ty Givens

Reputation: 111

How to fill an arraylist with an information from an array (java)

I am trying to create a program that reads from a txt file (this is the only thing in the file "5,5,5,0"). Then I want to take that information, put it in an array, then use that array to fill an array list. Then use that arraylist to write infromation into the file.

Here is what I have so far in my class file:

    import java.io.*;
    import java.util.Scanner;
    import java.util.ArrayList;

    public void setMoney() throws IOException {

        File moneyFile = new File ("Money.txt");
        Scanner moneyScan = new Scanner(moneyFile);

        String [] tokens = moneyFile.split(",");
        ArrayList<Integer> money = new ArrayList<Integer>(Arrays.asList(tokens));

        for(int i=0;i<tokens.length;i++){
            money.append(tokens[i]);
        }

        String s = Integer.toString(tokens[i]);

        FileOutputStream fos = new FileOutputStream("Money.txt");
        fos.write(money);
        fos.close();
}

Money.append is giving me this error:

error: cannot find symbol
money.append(tokens[i]);
^

symbol: method append(String) location: variable money of type ArrayList

moneyFile.split is giving me this error:

error: cannot find symbol
String [] tokens = moneyFile.split(",");
^
symbol:   method split(String)
location: variable moneyFile of type File

Upvotes: 1

Views: 1031

Answers (2)

Sami Eltamawy
Sami Eltamawy

Reputation: 9999

There are many ways to copy your data from Array to ArrayList:

The simplest one:

for (int i = 0; i < tokens.length; i++){
    money.add(tokens[i]);
}

To parse your data to String

String s = Integer.toString(tokens[i]);

To write your data into a File:

FileOutputStream fos = new FileOutputStream(path_filename_extension);
fos.write(money);
fos.close();

Upvotes: 2

Philip
Philip

Reputation: 281

You have to use FileInputStream instead of File. Also, use the Scanner object you create in order to get the int values:

FileInputStream moneyFile = new FileInputStream("path/money.txt");
Scanner moneyScan = new Scanner(moneyFile);
moneyScan.useDelimiter(",");
ArrayList<Integer> money = new ArrayList<Integer>();
while(moneyScan.hasNextInt())
    money.add(moneyScan.nextInt());

Upvotes: 2

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