... main(...)  throws IOException {


 Path p = Paths.get("myFile.txt");


 // Approach 1
 try( DataInputStream dis = new DataInputStream(  new FileInputStream(p.toFile()) ) ) {

    int x = dis.readInt();

 }

 // Approach 2
 DataInputStream dis =  null;
 try {
    dis = new DataInputStream(  new FileInputStream(p.toFile()) ) );

    int x = dis.readInt();

 } finally {
   if(dis == null) {
     dis.close();
   }
 }