Java file and folder copy, rename, file search

Java file Search public void Getdir (String strpath) throws Exception {try {file F=new file (strpath);
	            if (F.isdirectory ()) {file[] flist=f.listfiles ();
	                    for (int j=0;j<flist.length;j++) {if (Flist[j].isdirectory ()) {
	                    System.out.println (Flist[j].getpath ()); Getdir (Flist[j].getpath ());
	            The Getdir function itself is called inside the Getdir function} for (int j=0;j<flist.length;j++) {if (Flist[j].isfile ()) {System.out.println (FL
	                
	            Ist[j].getpath ())//change this to the statement you want to process. For example flist[j].substring (flist[j].length-3,3) = = "txt"}
	    A catch (Exception e) {e.printstacktrace ());
		} Java file and folder copy file Fileold = new file (pathold);
		File FileNew = new file (pathnew); if (Fileold.exiSTS ()) {try {FileInputStream FIS = new FileInputStream (fileold);
				FileOutputStream fos = new FileOutputStream (filenew);
				int read = 0;
					while (read = Fis.read ())!=-1) {fos.write (read);
				Fos.flush ();
				} fos.close ();
			Fis.close ();
			catch (FileNotFoundException e) {e.printstacktrace ();
			catch (IOException e) {e.printstacktrace ();
		Java file Renaming file = new file ("D:\\123.txt");
		if (file.exists ()) {File.renameto (New file ("D:\\1234.txt")); }