How to copy the source file content to the target file in Java

Package io_test; import Java. io. bufferedinputstream; import Java. io. bufferedoutputstream; import Java. io. file; import Java. io. fileinputstream; import Java. io. fileoutputstream; import Java. io. ioexception; import Java. io. inputstream; import Java. io. outputstream; public class iotest {public static void main (string [] ARGs) {file filesrcfile1 = new file ("E: \ new file folder .rar "); file filedestfile1 = new file ("E: \ demo \ new Folder. rar "); file filesrcfilef1 = new file (" e :\\ new folder. rar "); file filedestfilef1 = new file (" e :\demo \ new folder. rar "); try {long start1 = system. currenttimemillis (); copyfile1 (filesrcfile1, filedestfile1); long end1 = system. currenttimemillis (); system. out. println ("copyfile1 time consumed:" + (end1-start1)/1000.0); long start2 = system. currenttimemillis (); copyfile2 (filesrcfilef1, filedestfilef1); long end2 = SY Stem. currenttimemillis (); system. out. println ("copyfile2 time used:" + (end2-start2)/1000.0);} catch (ioexception e) {// todo auto-generated catch blocke. printstacktrace ();}} /*** copy the content of the source file to the target file ** @ Param SRC * Source File * @ Param DEST * target file */public static void copyfile1 (File SRC, file DEST) throws ioexception {bufferedinputstream Bis = NULL; bufferedoutputstream Bos = NULL; byte [] B = new byte [8192]; try {bis = New bufferedinputstream (New fileinputstream (SRC); Bos = new bufferedoutputstream (New fileoutputstream (DEST); For (int count =-1; (COUNT = bis. read (B ))! =-1;) {Bos. write (B, 0, count);} Bos. flush () ;}catch (ioexception e) {Throw e ;}finally {close (bis); close (BOS );}} /*** copy the content of the source file to the target file ** @ Param srcfile * Source File * @ Param destfile * target file */public static void copyfile2 (File srcfile, file destfile) throws ioexception {fileinputstream input = new fileinputstream (srcfile); try {fileoutputstream output = new fileoutputstream (destfile); try {byte [] buffer = new Byte [4096]; int n = 0; while (-1! = (N = input. Read (buffer) {output. Write (buffer, 0, n) ;}} finally {try {If (output! = NULL) {output. Close () ;}catch (ioexception IOE) {// ignore }}} finally {try {If (input! = NULL) {input. close () ;}} catch (ioexception IOE) {// ignore }}/ *** close both the input stream and output stream, convert the thrown exception to runtimeexception ** @ Param is * @ Param OS */public static void close (inputstream is, outputstream OS) {close (is ); close (OS);}/*** close the tool and method of the input stream, and convert the exception that may be thrown to runtimeexception ** @ Param is */public static void close (inputstream is) {If (is! = NULL) {try {is. close ();} catch (ioexception e) {e. printstacktrace () ;}}/ *** disable the tool and method of the output stream, convert the thrown exception to runtimeexception ** @ Param OS */public static void close (outputstream OS) {If (OS! = NULL) {try {OS. Close ();} catch (ioexception e) {e. printstacktrace ();}}}}