What is the difference between DataInputStream and FileInputStream?

An inputStream is the base class to read bytes from a stream (network or file). It provides the ability to read bytes from the stream and detect the end of the stream. DataInputStream is a kind of InputStream to read data directly as primitive data types.

What is DataInputStream class in Java?

Introduction. The Java.io.DataInputStream class lets an application read primitive Java data types from an underlying input stream in a machine-independent way.Following are the important points about DataInputStream − An application uses a data output stream to write data that can later be read by a data input stream.

Which is faster buffered reader or Scanner?

BufferReader has large buffer of 8KB byte Buffer as compared to Scanner. Scanner is bit slower as it need to parse data as well. BufferReader is faster than Scanner as it only reads a character stream.

How does DataInputStream work Java?

A data input stream lets an application read primitive Java data types from an underlying input stream in a machine-independent way. An application uses a data output stream to write data that can later be read by a data input stream. DataInputStream is not necessarily safe for multithreaded access.

Should I use Scanner or BufferedReader?

BufferedReader is synchronous while Scanner is not. BufferedReader should be used if we are working with multiple threads. BufferedReader has significantly larger buffer memory than Scanner. The Scanner has a little buffer (1KB char buffer) as opposed to the BufferedReader (8KB byte buffer), but it’s more than enough.

Why BufferedReader is faster than FileReader?

Whereas, BufferedReader creates a buffer, and reads large amount of data using the given FileReader and loads it into a input buffer in the memory. Each time you want to read the file data, you can read it from the buffer( you don’t have to directly access the disk drive every time) and hence is faster than FileReader.

What is the difference between BufferedReader and InputStreamReader?

BufferedReader is an “abstraction” that reads text from a character-input stream. It “buffers” characters so as to provide efficient reading of characters and lines. An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset.

What is bufferedinputstream used for?

As you picked up, BufferedInputStream is about reading in blocks of data rather than a single byte at a time. It also provides the convenience method of readLine (). However, it’s also used for peeking at data further in the stream then rolling back to a previous part of the stream if required (see the mark () and reset () methods).

How do I read a string from a BufferedReader?

Use a normal InputStream (e.g. FileInputStream) wrapped in an InputStreamReader and then wrapped in a BufferedReader – then call readLine on the BufferedReader. DataInputStream is good for reading primitives, length-prefixed strings etc.

How can I improve the reading efficiency of an InputStreamReader?

For improving reading efficiency, you should wrap an InputStreamReader within a BufferedReader. BufferedReader is an “abstraction” that reads text from a character-input stream. It “buffers” characters so as to provide efficient reading of characters and lines.