Big Data Java Foundation 15th day job

The first question: Implement file splitting, merging. Import java.io.file;import java.io.randomaccessfile;import java.io.fileoutputstream;import  java.io.fileinputstream;import java.io.bufferedoutputstream;import java.io.bufferedinputstream ;import java.util.list;import java.util.arraylist;class randomdome{     Public static void main (String[] args)  throws Exception{         randomsplit ("E:/index.txt", 3,5);         list <String> inpath_list = new ArrayList<String> ();         inpath_list.add ("E:/index0.txt");         inpath_ List.add ("E:/index1.txt");         inpath_list.add ("E:/index2.txt");         randommerge ("E:/index3.txt", Inpath_list);     }     public static void randomsplit (String inpath,string outpath,int num , Int buf_length)  throws Exception{        File  File = new file (Inpath);        randomaccessfile  Raf = new randomaccessfile (file, "R");        long  File_length = file.length ();         int avg_length  =  (int) file_length / 3;        for (int i=0;i <num;i++) {            int start_index  = i * avg_length;             Int end_index = 0;            if (i  ==  (num - 1)) {                end_ index =  (int) file_length - 1;             }else{                 end_index =  (i + 1)  * avg_length - 1;             }             raf.seek (Start_index);             Bufferedoutputstream out = new bufferedoutputstream (New fileoutputstream (Outpath  + i));            byte[] buf  = new byte[buf_length];             System.out.println (start_index +  "---"  + end_index);             while (True) {                 int current_index =  (int) raf.getfilepointer ();                 int remain = end_index -  current_index + 1;                 system.out.println (current_index +  "---"  + remain);                 if (remain >=  Buf.length) {                     raf.read (BUF);                   &Nbsp; out.write (BUF);                 }else{                     raf.read (Buf,0,remain);                     out.write (Buf,0,remain);                 }                 if (Raf.getfilepointer ()  > end_ Index) {                     break;                 }                }    &nbsP;        out.close ();         }        raf.close ();    }     Public static void randommerge (string outpath,list<string> inpath_list)   throws exception{        bufferedoutputstream out =  new bufferedoutputstream (New fileoutputstream (outpath));         for (string inpath : inpath_list) {             bufferedinputstream in = new bufferedinputstream (new  FileInputStream (Inpath));            byte[]  buf = new byte[1024];             int len;            while ((Len = in.read (BUF))  != -1) {                 out.write (BUF, 0,len);            }             in.close ();        }         out.close ();     }}

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Big Data Java Foundation 15th day job