Understanding of Java PrintStream

PrintStream is actually a kind of filteroutputstream

public class PrintStream extends Filteroutputstream implements Appendable, closeable

Directly known subclasses:

LogStream is obsolete. No alternative version

PrintStream

Public PrintStream (OutputStream out,

Boolean AutoFlush) to create a new print stream.

Parameters:

Out-the output stream to which the values and objects will be printed

Autoflush-boolean variable; If true, the output buffer is flushed whenever a byte array is written, one of the println methods is called, or a newline character or byte (' \ n ') is written

In addition to the filteroutputstream of Write,flush and other methods, is a big push of the Print method

Special PrintStream:

System. In ———— key is already open

public static final InputStream in "standard" input stream. This stream is open and ready to provide input data. Typically, this stream corresponds to keyboard input or another input source specified by the host environment or user.

Out

public static final PrintStream out "standard" output stream. This stream is open and ready to accept output data. Typically, this stream corresponds to the display output or another output target specified by the host environment or user.

Err

public static final PrintStream err "standard" error output stream. This stream is open and ready to accept output data.

Typically, this stream corresponds to the display output or another output target specified by the host environment or user

Understanding of Java PrintStream