帮忙找一下错误

public class RandomAccessTest {

    public static void main(String[] args) throws IOException {
        try {
            RandomAccessFile raf = new RandomAccessFile("d://data//wof.txt",
                    "rw");
            System.out.println("请输入20个整数");
            int k[] = new int[20];
            for (int i = 0; i < 20; i++) {
                /**
                System.out.println("输入第" + (i + 1) + "个");
                BufferedReader br = new BufferedReader(new InputStreamReader(
                        System.in));
                String m = br.readLine();
                k[i] = Integer.parseInt(m.trim());
                System.out.println(k[i]);
                */
                //raf.writeInt(k[i]);
                raf.writeInt(i);//不需要从键盘输入，直接输入就可以了
            }
            raf.seek(12);
            while (true) {
                try {
                    int r =(int) raf.readInt();
                    System.out.println(r);
                } catch (EOFException e) {
                    break;
                }
            }

        } catch (RuntimeException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

    }
}