Differences between java. io. Reader and java. io. InputStream

Java. io. Reader and java. io. InputStream constitute Java input classes. Reader is used to read 16 characters, that is, Unicode-encoded characters. InputStream is used to read

Input ASCII characters and binary data.
In Java, different types of Reader input streams correspond to different data sources:

FileReader is used for input from a file;

CharArrayReader is used to input character arrays from the program;

StringReader is used to input strings from the program;

PipedReader is used to read data written to the pipeline from PipedWriter in another thread.

Different types of InputStream input streams correspond to different data sources: FileInputStream, ByteArrayInputStream, StringBufferInputStream,

PipedInputStream. In addition, there are two InputStream input streams that do not have the corresponding Reader type:

Socket is used for sockets;

URLConnection is used for URL connection.

These two classes use getInputStream () to read data.

Correspondingly, there are similar differences between java. io. Writer and java. io. OutputStream.