Java--io class, character stream write data

OutputStreamWriter Writing Data
█ OutputStreamWriter Write Data method
        ?Public void Write (int c); //write a single character.          ?Public void write (char[] cbuf); //writes an array of characters.      ?Public void write (char[] cbuf,int off,int len); //writes a portion of a character array.           ?Public void write (String str); //write String.      ?Public void write (String str,int off,int len); //write a part of the string. █ problems to be noticed in character stream operation
        ?The role of Flush ()     ?The difference between flush () and close ()

public static void Main (string[] args) throws IOException {//character stream = byte stream + encoding table FileOutputStream fos = new FileOutputStream ("1.txt"); //No impact. If the file does not exist, it is created//fileinputstream fis = new FileInputStream ("2.txt"); //If the file does not exist, subsequent operations cannot be done//outputstreamwriter OSW = new OutputStreamWriter (FOS);//To write the default encoding table is the system default (utf-8) OutputStreamWriter OSW = new OutputStreamWriter (FOS, "utf-8"); Osw.write ("Hello! ");//Do not write flush cannot flush buffered write file, close Close file also has this functionOsw.write (' Medium ');//write single characterOsw.write ("First meeting, please take more care", 2, 3);//write a part of a string; start with the second character, write three altogether

char[] ch = {' present ', ' Day ', ' Down ', ' rain '};        Osw.write (CH);     //write array osw.write (CH, 2, 2); //Starting from the second character of the array, write 22 to buffer Osw.flush ();     //Refresh buffer to write data in the pipeline to file osw.close (); //Release resources, but flush} before release }

Java--io class, character stream write data