debugger в IDEA

public class Solution {
    public static void main(String[] args) throws IOException, InterruptedException {
(тут стоит break)        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        FileInputStream f6 = null;
        FileInputStream f7 = null;
        String s = null,s2 = null;

        byte[] b = new byte[1000];
        byte[] u = new byte[1000];

        s = reader.readLine();
        s2 = reader.readLine();
        f6 = new FileInputStream(s);

        while (f6.available() > 0) {
            f6.read(b);
        }

        f6.close();

        FileOutputStream f8 = new FileOutputStream(s);
        f7 = new FileInputStream(s2);

while (f7.available() > 0) {
            f7.read(u);
            int j = 0;
            while (u[j] != 0){
                f8.write(u[j]);
                j++;
            }
        }
        f7.close();
        f8.close();

        FileOutputStream f9 = new FileOutputStream(s, true);
        int i = 0;
        while(b[i] != 0){
            f9.write(b);
            i++;
        }
        f9.close();
    }
}