IO stream for Java

1.FileWriter class

The inflow and outflow of Io stream is based on the Java program, and enters the program as input, and the program is output.

1.1. Construction method

FileWriter class

Construction method	Parameters	Description
Public FileWriter (String fileName)	Represents the system-related file name	Constructs a FileWriter object based on the given file name.
Public FileWriter (String fileName, Boolean append)	Append if True, data is written to the end of the file

1.2. Member Methods

FileWriter class

Parent class Inheritance	Member Methods	Parameters	Description
Java.io.Writer;	public void Write (String str)	STR is the string to write to	Constructs a FileWriter object based on the given file name.
Java.io.OutputStreamWriter	public void Flush ()		Refreshes the buffer of the stream object
Java.io.OutputStreamWriter	public void Close ()		Close Stream Object
Java.io.OutputStreamWriter	Public String getencoding ()		Returns the character encoding name used by the stream

Simple example: Save "Hello World" to a file. A string that does not exist when the file is created, overwriting The original file content when the file exists.

  1  FileWriter fw = new  FileWriter (" Ioflow.txt "  2  fw.write ("Hello"   3  fw.write (""   4  fw.write ("World"   5  fw.write ("."   6   7   Fw.flush ();   8  String encode = fw.getencoding ();    9  System.out.println (encode); // GBK  10  fw.close (); 

After the stream is closed, the GetEncoding () method is called, and Null is returned.

1 fw.close (); 2 encode = fw.getencoding (); 3 System.out.println (encode);  // NULL

IO stream for Java