Java I/O Course in English

Java I/O

• ‌It is used to process the input and produce the output.
• It uses stream to make operations faster.
• java io package contains all the classes for IO.

‌Stream

• ‌Sequence of data
• Stream is made of byte

‌Java FileOutputStream:

• ‌output stream used for writing data to a file

Java FileInputStream :

• It is used to read data in the form of bytes from file. It is used for reading byte-oriented data like audio, video, image and etc.
• Java BufferedOutputStream:
• It internally uses buffer to store data.
• It is more efficient way to write data than FileOutputStream public class BufferedOutputStream extends FilterOutputStream

Java BufferedInputStream:

• BufferedInputStream class is used to read information from stream It internally uses buffer mechanism to make the performance fast

Java SequenceInputStream

• Java SequenceInputStream class is used to read data from multiple streams.
• It reads data sequentially

Java ByteArrayOutputStream

• It is used to write common data into multiple files.
• It holds a copy and forwards it to multiple streams.

Java DataOutputStream

It writes primitive Java data types to the output stream in a machine-independent way.

Java DataInputStream

It reads primitive data from the input stream in a machine-independent way.

What is character encoding?

• Since every data in computer is represented in bytes and Strings are essentially collection of characters.
• To convert bytes into character JVM needs to know which combination of bytes represent which character and this is what character encoding tells JVM.
• There are many languages in the World like English, Tamil, Telugu and etc.
• This is the reason why we need to give correct character encoding while converting the bytes to String.

Java FileWriter

• It is used to write character-oriented data to a file.
• Unlike FileOutputStream class, you don’t need to convert string into byte array because it provides method to write string directly.

Java BufferedWriter

• It is used to provide buffering for Writer instance.
• It makes the performance fast.