How to subtract two string arrays in java as they are shown in code -

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//what should subtract quan objin? //means quan has values 1,2,7,9 , objin has values 5,6,7,8 how subtract result 4,4,0,1 want operation quan[]=quan[]-objin[] done?

public static void equalizer(int i, int s, string quan[], string objin[]) {     int j;     scanner inp = new scanner(system.in);      for(j=0;j<i;j++)     {         system.out.print(objin[j]+"=");         objin[j]=inp.nextline();     }      for(j=0;j<s;j++)     {         system.out.print(quan[j]+"=");         quan[j]=inp.nextline();     } }

there's subtract() method 

public string[] subtract(string[] sa1, string[] sa2){   list<string> r = new arraylist<>();   (int = 0; < sa1.length; i++){     if (i >= s2.length) {       r.add(sa1[i]);       continue;     }     try {      r.add(string.valueof(integer.parseint(sa1[i]) - integer.parseint(sa2[i])));       } catch (parseexception e) {       e.printstacktrace();     }          }    return r.toarray(new string[r.size()]);  }

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