hasNextInt（）对于已解析的String输入返回false

Question

Hi I have a problem with reading a text-file:

I load into Java a file called huizen.txt, which is the following: (I put it in workspace, C:\\, src, bin, in Files in the project itself and on the desktop, still dont know where to put it correctly)

3
Emmalaan 23
3051JC Rotterdam
7 kamers
prijs 300000
Javastraat 88
4078KB Eindhoven
3 kamers
prijs 50000
Javastraat 93
4078KB Eindhoven
4 kamers
prijs 55000

Now I want (in the end......) to say loop for 3 times through a read-method for appartments since 3 is the number of appartments. But when I try: int NumberOfAppartmentsInList = scanner.nextInt(); , this does not work! I get false even for scanner.hasNextInt() , even when I try NumberOfAppartmentsInList = Integer.parseInt(list.get(0)) when I create an arraylist for the string lines..

Can anyone help me out?

Tnx in advance!

Grtz (code below)

public static Portefeuille read(String infile) throws Exception
{

    Portefeuille protonX = new Portefeuille();
    ArrayList<String> huizen = new ArrayList<String>();
    Scanner sc = new Scanner("huizen.txt");

    while (sc.hasNext())
    {
    huizen.add(sc.nextLine());
    }

    String infil3 = huizen.toString();
    Scanner scan = new Scanner(infil3);

    if (scan.hasNextInt())
    {
    int aantal = scan.nextInt();
    System.out.println(aantal);
    }
    else{
        System.out.println("ERROR");
    }

    ArrayList<Woning> list = new ArrayList<Woning>();
    for (int i = 0; i < 4; i++)
    {
        list.add(Woning.read(scan));
    }

    scan.close();
    sc.close();
    return protonX;
}

Answer 1

You did not read the data in the right order, I guess. Plus huizen.toString() will not give you the sum of all strings.

So the one way to fix it might be like this:

public static Portefeuille read(String infile) throws Exception {

Portefeuille protonX = new Portefeuille();
ArrayList<String> huizen = new ArrayList<String>();
Scanner sc = new Scanner("huizen.txt");

while (sc.hasNext())
{
huizen.add(sc.nextLine());
}

String infil3   = "";

for (String h : huizen)
{
    infil3 += h + "\n";
}

Scanner scan = new Scanner(infil3);

if (scan.hasNextInt())
{
int aantal = scan.nextInt();
System.out.println(aantal);
}
else{
    System.out.println("ERROR");
}

ArrayList<Woning> list = new ArrayList<Woning>();
for (int i = 0; i < aantal; i++)
{
    list.add(Woning.read(scan));
}

scan.close();
sc.close();
return protonX;

}