I have the following sample data in a .txt file
111, Sybil, 21
112, Edith, 22
113, Mathew, 30
114, Mary, 25
the required output is
[{"number":"111","name":"Sybil","age":"21" },
{"number":"112","name":"Edith","age":"22"},
{"number":"113","name":"Mathew","age":"30"},
"number":"114","name":"Mary","age":"25"]
Sadly, I have not gone far because I cant seem to get the values out of each line. instead, this is what is displayed
[one, two, three]
private void loadFile() throws FileNotFoundException, IOException {
File txt = new File("Users.txt");
try (Scanner scan = new Scanner(txt)) {
ArrayList data = new ArrayList<>() ;
while (scan.hasNextLine()) {
data.add(scan.nextLine());
System.out.print(scan.nextLine());
}
System.out.print(data);
}
I would appreciate any help. thank you
>Solution :
Not too sure about the requirements. If you just need to know how to get the values out, then use String.split() combined with Scanner.nextLine().
Codes below:
private void loadFile() throws FileNotFoundException, IOException {
File txt = new File("Users.txt");
try (Scanner scan = new Scanner(txt)) {
ArrayList data = new ArrayList<>();
while (scan.hasNextLine()) {
// split the data by ", " and split at most (3-1) times
String[] input = scan.nextLine().split(", ", 3);
data.add(input[0]);
data.add(input[1]);
data.add(input[2]);
System.out.print(scan.nextLine());
}
System.out.print(data);
}
}
The output would be as below and you can further modify it yourself:
[111, Sybil, 21, 112, Edith, 22, 113, Mathew, 30, 114, Mary, 25]
However, if you need the required format as well, the closest I can get is by using a HaspMap and put it into the ArrayList.
Codes below:
private void loadFile() throws FileNotFoundException, IOException {
File txt = new File("Users.txt");
try (Scanner scan = new Scanner(txt)) {
ArrayList data = new ArrayList<>();
while (scan.hasNextLine()) {
// Create a hashmap to store data in correct format,
HashMap<String, String> info = new HashMap();
String[] input = scan.nextLine().split(", ", 3);
info.put("number", input[0]);
info.put("name", input[1]);
info.put("age", input[2]);
// Put it inside the ArrayList
data.add(info);
}
System.out.print(data);
}
}
And the output would be:
[{number=111, name=Sybil, age=21}, {number=112, name=Edith, age=22}, {number=113, name=Mathew, age=30}, {number=114, name=Mary, age=25}]
Hope this answer helps you well.