java - Array CompareFind Equals words only using array not array list -

have 2 text file words list. need save both file in 2 array.i know how using list , set.. here want know how using arrays.only array , no predefined functions such arrays.sort() or collections.sort() can used
no list no arraylist or no class java collection frameworks can used.

public class main { public static set<string> setlist1= new hashset<>(); public static string[] arraylist=new string[file1count]; public static string[] array2=new string[file2count]; public static int file1count=0; public static int file2count=0;     public static void main(string[] args) {     try {         /*read files*/         scanner rf= new scanner(new bufferedreader(new          filereader("d:\\iit\\project save\\new\\inteli j\\oopworkshop01\\file1.txt")));         scanner rf2= new scanner(new bufferedreader(new filereader("d:\\iit\\project save\\new\\inteli j\\oopworkshop01\\file2.txt")));         string line;         string line2;           while(rf.hasnext()){             line=rf.nextline();             file1count++;         }          while(rf2.hasnext()){             line2=rf2.nextline();             file2count++;         }          rf.close();         rf2.close();      }catch(ioexception e){         system.out.println(e);     } } }   

the problem using arrays don't know in advance length allocate.

you have 2 options:

• read each file twice
• allocate array of initial length, , reallocate needed (that's arraylist does.)

second option: let's have method readfile reads lines file , returns array:

public static string[] readfile(string filename) throws ioexception {     try (reader reader = new filereader(filename);             bufferedreader in = new bufferedreader(reader)) {         string[] lines = new string[10]; // start 10         int count = 0;         string line;         while ((line = in.readline()) != null) {             if (count >= lines.length) {                 lines = reallocate(lines, count, 2*lines.length);             }             lines[count++] = line;         }         if (count < lines.length) {             // reallocate final length;             lines = reallocate(lines, count, count);         }         return lines;     } }  private static string[] reallocate(string[] lines, int count,         int newlength) {     string[] newarray = new string[newlength];     (int = 0; < count; ++i) {         newarray[i] = lines[i];     }     lines = newarray;     return lines; }