I have a class named Gun, which has as attributes two integers and a string, I would like to make a vector of type Gun and that each position is filled with the data of a file for example that the .txt file contains:
25,20,Pistol
so that the position 0 the first integer receives 25, the second 20, and the string "pistol".
if possible? thanks in advance
Assuming you have a class like the following:
class Gun {
int A, B;
String C;
public Gun(int A, int B, String C) {
this.A = A;
this.B = B;
this.C = C;
}
//////// Éstos son métodos auxiliares, ignorar.
// Constructor para prueba
public Gun(String[] line) {
this.A = Integer.parseInt(line[0]);
this.B = Integer.parseInt(line[1]);
this.C = line[2];
}
// Método para obtener la representación en string
// del objeto...
public String getText(){
return A + "," + B + "," + C;
}
}
One way, of the several that exist, to write and read text from / to a file is as follows:
public static void main(String... args) {
// El "vector" de guns
List<Gun> guns = new ArrayList() {{
add(new Gun(1, 1, "A"));
add(new Gun(2, 2, "B"));
// ...
}};
// Escribir a un archivo
try (PrintWriter writer = new PrintWriter("guns.txt", "UTF-8")) {
guns.forEach(gun -> writer.println(gun.getText()));
} catch (IOException ex) {
System.out.println(ex);
}
guns.clear();
// Leer de ese mismo archivo
try (BufferedReader in = new BufferedReader(new FileReader("guns.txt"))) {
for (String s = in.readLine(); s != null; s = in.readLine())
guns.add(new Gun(s.split(",")));
} catch (IOException ex) {
System.out.println(ex);
}
guns.forEach(gun -> System.out.println("Gun: " + gun.getText()));
}
If you are interested in saving information about your objects, another possible solution would be to serialize.