Java regular expressions, replacing pictures, replacing numbers, harmonizing words, copying files

/**
* INDEXOF ("character", position int)//In the method, enter only the first property by default to find the character in the property from the beginning, and the position int to find the character from the input int position
* LASTINDEXOF ("character")// From the string, find the character in the last property
* str= "www.oracle.com";//substring intercept String
* str.substring (4,10)//intercept from fourth to 10th bit
* Str.substring (4)//intercept from fourth bit to end
* Str.charat (4)//intercept string fourth character
* Boolean startwith ("Thi"), Endwith ("Ava")// Determines whether the string starts with thi, determines whether the string ends with Ava
* str.toupercase,str.tolowercase//string all converts to uppercase//string all to lowercase
* string.valueof (i)// Converts the base type to a string
* regex= "[a-za-z0-9_][email protected][a-za-z0-9_]+ (\\.[ a-za-z]+) + "//mailbox Regular Expression
* Boolean match=<string>mail.matches (Regex)//string supports regular expression-related methods Boolean match= Mail.matches (regex);
* string[] Data=str.split ("[0-9]+");//Split the number part, get all the letter part
* File.canread (); File.canwrite (); File.ishidden (); File.getabosolutepath (); File.exist (); File.mkdir ();//create directory file. Directory ()//boolean directories
* file[] subs=file.listfiles ();//returns subkeys in the File directory to the Subs array subs.getname () Gets the subkey name
* The high concurrency of the computer says that multiple programs run concurrently, that is, multithreading runs
*
*/

/** Replace picture name
* public static void Main (string[] args)
{
String imgname= "1234.jpg";
String[] Data=imgname.split ("\ \");
Imgname=system.currenttimemillis () + "." +data[1];//1. To the right of the number, 0 indicates the left side of the number.
System.out.println (imgname);
}
* */
/** Replace the number part with String.replaceall ("regex", "str")
* public static void Main (string[] args)
{
String str= "ABC123DEF456GHI789JKL";

Str=str.replaceall ("\\d+", "#NUMBER #");//"\\d+" represents the number part
System.out.println (str);
}
* */
/** Harmonious language
public static void Main (string[] args)
{
String regex= "(WQNMLGDSB|CNM|NC|TMD|MDZZ|MMP|DJB)";
String message= "wqnmlgdsb!nizhegenc!mdzz!nigedjb!";
Message=message.replaceall (Regex, "* * *");
SYSTEM.OUT.PRINTLN (message);
}
*/
/** search function, get directory under "." The beginning of the subkey
* public static void Main (string[] args)
{
File File=new file (".");
FileFilter filter=new FileFilter () {
/**
* Add filter condition as long as the parameter given by the file is considered
* Meet the requirements, then return True
*
Public boolean accept (file file)
{
String Name=file.getname ();
System.out.println ("Filtering:" +name);
Return Name.startswith (".");
}
};
File[] Subs=file.listfiles (filter);
for (int i=0;i<subs.length;i++)
{
System.out.println (Subs[i].getname ());
}
}
*/
/** Copying files
* public static void Main (string[] args) throws IOException
{
/**
* The idea of implementing File replication:
* Use RAF to read each byte sequentially from the source file
* and write to another file
*
Randomaccessfile rw=new randomaccessfile ("Movie_cp.mp4", "RW");
Randomaccessfile r=new randomaccessfile ("Movie.mp4", "R");
/**
* Used to save every byte read to
*
*
int d=-1;
Long Start=system.currenttimemillis ();
while ((D=r.read ())!=-1)//means! Read to last file
{
Rw.write (d);
}
Long end =system.currenttimemillis ();
System.out.println ("Copy done! Time consuming: "+ (End-start) +" MS ");

R.close ();
Rw.close ();
}
}
* */

Java regular expressions, replacing pictures, replacing numbers, harmonizing words, copying files