Copy of Java------files

Import Java.io.fileinputstream;import Java.io.filenotfoundexception;import Java.io.fileoutputstream;import Java.io.ioexception;public class Filecopystream {public static void main (string[] args) {//filecopy0 ("B.dat", "d:/ex/a/ "," d:/ex/b/"),//filecopy1 (" B.dat "," d:/ex/a/"," d:/ex/b/"),//filecopy2 (" B.dat "," d:/ex/a/"," d:/ex/b/"); FileCopy2 ( "1.mp3", "d:/ex/a/", "d:/ex/b/"),//filecopy3 ("C.mp3", "d:/ex/a/", "d:/ex/b/"),//filecopy3 ("D.txt", "d:/ex/a/", "d:/ ex/b/");} private static void FileCopy0 (String fileName, String dir1,string dir2) {try {fileinputstream in = new FileInputStream (dir1 +filename); FileOutputStream out = new FileOutputStream (dir2+filename); byte[] buffer = new Byte[512];in.read (buffer); Out.write ( buffer);} catch (FileNotFoundException e) {e.printstacktrace ()} catch (Exception e) {}}//learn mathematic private static void FileCopy1 (String FileName, String dir1,string dir2) {fileinputstream in = null; FileOutputStream out = null;try {in = new FileInputStream (dir1+filename), out = new FileOutputStream (dir2+fiLename); byte[] buffer = new Byte[512];in.read (buffer); out.write (buffer); catch (FileNotFoundException e) {e.printstacktrace ();} catch (Exception e) {}finally{try {in.close (); Out.close ();} catch (IOException e) {throw new RuntimeException ("File cannot be closed");}}} Ability to copy large file private static void FileCopy2 (String fileName, String dir1,string dir2) {fileinputstream in = null; FileOutputStream out = null;try {in = new FileInputStream (dir1+filename), out = new FileOutputStream (dir2+filename); byte[ ] buffer = new Byte[512];int num = 0;do{num = in.read (buffer); Out.write (buffer,0,num);} while (num>=0);} catch (FileNotFoundException e) {e.printstacktrace ();} catch (Exception e) {e.printstacktrace ();} Finally{try {in.close (); Out.close ();} catch (IOException e) {throw new RuntimeException ("File cannot be closed");}} Ability to copy large file private static void FileCopy3 (String fileName, String dir1,string dir2) {fileinputstream in = null; FileOutputStream out = null;try {in = new FileInputStream (dir1+filename), out = new FileOutputStream (Dir2+filenAME); byte[] buffer = new Byte[512];int Num=0;while (in.available () >0) {num = in.read (buffer);//simplest encryption for (int i=0;i <num;i++) {Buffer[i] = (byte) (buffer[i]+1);} Out.write (Buffer,0,num);}} catch (FileNotFoundException e) {e.printstacktrace ();} catch (Exception e) {}finally{try {in.close (); Out.close ();} catch (IOException e) {throw new RuntimeException ("File cannot be closed");}}}

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Copy of Java------files