Will closing a DataInputStream also close the FileInputStream?

Question

FileInputStream fstream = new FileInputStream(someFile.getPath());
DataInputStream in = new DataInputStream(fstream);

If i call in.close(), will it also close fstream ? My code is giving GC Exception as follows:

java.lang.OutOfMemoryError: GC overhead limit exceeded

Answer 1

Yes, DataInputStream.close() also closes your FileInputStream.

This is because DataInputStream inherits FilterInputStream which has the following implementation of the close() method:

    public void close() throws IOException {
        in.close();
    }