读取 file.txt 并拆分 (:)

Question

I have file txt with format like this

Nama: John
Biologi: 8
Kimia: 9
Fisika: 10

Nama: Peter
Biologi: 10
Kimia: 8
Fisika: 7

Nama: Steve
Biologi: 8
Kimia: 9
Fisika: 6

I try to read it with buffer reader but it wont show anything when i print out, i want to get the value and store it into arraylist of string here is my try.....

try{
        File database = new File(file);
        FileReader fileInput = new FileReader(database);
        BufferedReader in = new BufferedReader(fileInput);
        String line = in.readLine();
        String[] data;
        while (line != null){
            data = line.split(":");
            list_Siswa.add(data);
            line = in.readLine();
        }
       String datas = "";
       for (String[] dataSiswa : list_Siswa){//for each to print data into variable
           datas += "\nNama: " + dataSiswa[0] + "\n" +
                   "Kimia: " + dataSiswa[1] + "\n" +
                   "Biologi: " + dataSiswa[2] + "\n" +
                   "Fisika: " + dataSiswa[3] + "\n";
       }
       System.out.println(datas);
        in.close();
    }catch (Exception e){
        System.out.println(e);
   }

java.lang.ArrayIndexOutOfBoundsException: Index 2 out of bounds for length 2 (That is the error i get)

i'm trying the excat format to be print out as the file

Answer 1

You add each line to the variable list_Siswa . So for instance the first element of list_Siswa will be ["Nama"," John"] , and so data_Siswa[0] equals "Nama" and data_Siswa[1] equals " John" . Then data_Siswa[2] throws an error, because there is no such element in the array.

The code isn't smart enough to see Nama: John and assume the following lines are grades that should be associated with John. If you want that, you'll have to do it yourself.