java - Storing strings that appear after a word in a document into arrays and combining them -


i have file, which, among other data, has following lines:

group = a_1 group_sub = a101,a102,a103,a104 group = a_2 group_sub = a201,a202,a203,a204,a205,a206

a1 males, , a2 females. need read in file, , each time reaches word "group", store name of group (for example, a_1) in array. move on next line , store subjects in group array [a101,a102,a103,a104]. , need merge name of group subjects in group males , females so:

[a_1,a101,a102,a103,a104] (for males) [a_2,a201,a202,a203,a204,a205,a206] (for females)

my code:

public class test {     file fromfile = new file(filename);              bufferedreader br = new bufferedreader(new filereader(fromfile));     string line;     while ((line = br.readline()) != null){         string[]grouptitle = null;         string[]groupsubjects = null;         if (line.startswith("group")){               string[] title = line.split("= ");                             grouptitle= title[1].split(" ");           //  system.out.println(arrays.tostring(grouptitle));         }             if (line.startswith("group_sub")){                  string[] names = line.split("= ");                     groupsubjects= names[1].split(", ");                  // system.out.println(arrays.tostring(groupsubjects));             }              string[] both = new string[grouptitle.length + groupsubjects.length];             system.arraycopy(grouptitle, 0, both, 0, groupsubjects.length);             system.arraycopy(groupsubjects, 0, both, grouptitle.length, groupsubjects.length); } }

at moment, within loop prints out :

[a_1] [a101,a102,a103,a104] [a_2] [a201,a202,a203,a204,a205,a206]

when try merge arrays, return empty. doing wrong?

try code need first group , group_sub have merge arrays after group_sub.

while ((line = br.readline()) != null){             if (line.startswith("group")&&line.contains(",")==false){                   string[] title = line.split("= ");                                 grouptitle= title[1].split(" ");           // system.out.println(arrays.tostring(grouptitle));              }                if (line.startswith("group_sub")){                      string[] names = line.split("= ");                         groupsubjects= names[1].split(", ");                 //    system.out.println(arrays.tostring(groupsubjects));                       if(grouptitle!=null&&groupsubjects!=null){                       string[] both = new string[grouptitle.length + groupsubjects.length];                        system.arraycopy(grouptitle, 0, both, 0, groupsubjects.length);                       system.arraycopy(groupsubjects, 0, both, grouptitle.length, groupsubjects.length);                       system.out.println(arrays.tostring(both));                        }                 }   }

this give output this

[a_1, a101,a102,a103,a104] [a_2, a201,a202,a203,a204,a205,a206]

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