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Save the data of a text file in a arraylist


Save the data of a text file in a arraylist

By : user2187723
Date : November 28 2020, 04:01 AM
I wish this helpful for you I have a problem with my arraylist; indeed I need to fill my "list_Line" list with the data from my text file (example.txt) but after adding them to my list I can display my list but it seems empty... So did I fill in my list incorrectly or did I go about displaying its content incorrectly (I tried two different methods though) Please what do I have to do to be able to see the data in my text on the console? , You haven't even called charged() method. Call it and reply.
code :


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how to save the data from iphone application to text file and save in documents

how to save the data from iphone application to text file and save in documents


By : vega
Date : March 29 2020, 07:55 AM
help you fix your problem You create a text file let it be "file.txt" and write required data, here "yourString" as follows,
code :
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"file.txt"];
 NSString *stringWithoutSpaces = [yourString stringByReplacingOccurrencesOfString:@" " withString:@""];
[stringWithoutSpaces writeToFile:filePath atomically:TRUE encoding:NSUTF8StringEncoding error:NULL];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"file.txt"];
    NSString *yourString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:NULL];
Is there an easy way to save arraylist/variables data to a file in Java?

Is there an easy way to save arraylist/variables data to a file in Java?


By : Mohammad Akhavan
Date : March 29 2020, 07:55 AM
it should still fix some issue The keyword is serialization. The elements in your List need to implement the Serializable interface, also all the elements in that class.
code :
static class Baz implements Serializable {
    private static final long   serialVersionUID    = 1L;
    int i;
    String s;
    public Baz(int i, String s) { this.i = i; this.s = s; }
}

@Test
public void serAL() throws FileNotFoundException, IOException, ClassNotFoundException {
    List<Baz> list = Arrays.asList(new Baz(1, "one"), new Baz(2, "two"), new Baz(3, "three"));
    try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("al.dat"))) {
        oos.writeObject(list);
    }
    try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream("al.dat"))) {
        @SuppressWarnings("unchecked")
        List<Baz> serAL = (List<Baz>) ois.readObject();
        Assert.assertEquals(3, serAL.size());
        Assert.assertEquals(1, serAL.get(0).i);
        Assert.assertEquals("one", serAL.get(0).s);
        Assert.assertEquals(2, serAL.get(1).i);
        Assert.assertEquals("two", serAL.get(1).s);
        Assert.assertEquals(3, serAL.get(2).i);
        Assert.assertEquals("three", serAL.get(2).s);
    }
}
how to save csv like text file in an ArrayList to sort by name

how to save csv like text file in an ArrayList to sort by name


By : mahadeb kesh
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Create a class, let's called Person. Then read each line, split it to get the different parts, create a new Person and add it to the list. Then sorting it later would be easy, providing a custom comparator to Collections.sort, telling that you want to sort your List based on person's name.
Creating an ArrayList from data in a text file

Creating an ArrayList from data in a text file


By : Trần Quang Phúc
Date : March 29 2020, 07:55 AM
wish of those help I am trying to write a program that uses two classes to find the total $ amount from a text file of retail transactions. The first class must read the file, and the second class must perform the calculations. The problem I am having is that in the first class, the ArrayList only seems to get the price of the last item in the file. Here is the input (which is in a text file): , Basically what you have is:
code :
while ((line = bufferReader.readLine()) != null) {
    substring = line.substring(1, line.lastIndexOf(" ") + 1);
}

priceSubstring = substring.substring(0,substring.indexOf(" "));

quantitySubstring = substring.substring(substring.indexOf(" ") + 1 , substring.lastIndexOf(" ") );


double price = Double.parseDouble(priceSubstring);
double quantity = Double.parseDouble(quantitySubstring);

priceArray.add(price);
quantityArray.add(quantity);

System.out.println(priceArray);
while ((line = bufferReader.readLine()) != null) {
    substring = line.substring(1, line.lastIndexOf(" ") + 1);
    priceSubstring = substring.substring(0,substring.indexOf(" "));

    quantitySubstring = substring.substring(substring.indexOf(" ") + 1 , substring.lastIndexOf(" ") );

    double price = Double.parseDouble(priceSubstring);
    double quantity = Double.parseDouble(quantitySubstring);

    priceArray.add(price);
    quantityArray.add(quantity);

    System.out.println(priceArray);
}
Add text file data to a Arraylist

Add text file data to a Arraylist


By : MaxJ
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I want to add text file data to an ArrayList. This is my text file , Create a new Employee object each time:
code :
while ((aLine = in.readLine()) != null) {
    String[] tokens = aLine.split(" ");

    Employee emp = new Employee();
    emp.setUser_id(tokens[0]);
    emp.setmDate(tokens[1]);
    employeArrayList.add(emp);

    out.write(aLine);
    out.newLine();
}
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