Java->io Stream _ print stream

打印流的概述

打印流The ability to add output data makes it easy to print various data value representations.

The print flow is categorized according to the flow:

Never throw an IO exception

L byte print stream printstream

L character Print stream printwriter

L Method:

void print (String str): Outputs any type of data,

void println(String str): Outputs any type of data, automatically writes a line-break operation

L Code Demo:

/*

* Requirements: Write the specified data to the PrintFile.txt file

*

Analysis

* 1, create a stream

* 2, write data

* 3, close the stream

*/

Public class Printwriterdemo {

Public Static void Main (string[] args) throws IOException {

//Create stream, can pass OutputStreamWriter object also can pass path string

PrintWriter out = new PrintWriter (New FileWriter ("PrintFile.txt"));

PrintWriter out = new printwriter ("PrintFile.txt");

2, write Data

for (int i=0; i<5; i++) {

out.println ("HelloWorld");

}

3, close the stream

Out.close ();

}

}

Print flow complete data refresh automatically

The automatic refresh function of file data can be done by constructing method.

L Construction Method:

L Open File Auto- Refresh write function

Public PrintWriter (OutputStream out, boolean autoflush)

Public PrintWriter (Writer out, boolean AutoFlush)

L Code Demo:

/*

Analysis

* 1, create a stream

* 2, write data

*/

Public class PrintWriterDemo2 {

Public Static void Main (string[] args) throws IOException {

Create a Stream

PrintWriter out= New printwriter(new outputstreamwriternew fileoutputstream("d:\\temp\\ Test.txt ",true)," GBK "),true);

　　↑ Whether to continue writing  　　↑ Character Set ↑ Whether to flush writes
Write Data
Out.println ("Tom");
Out.print ("Hello");

3, close the stream

Out.close ();

}

}

Java->io Stream _ print stream