In the below example I have created extend array function. Here first I have define array length then extend new array value. You can see below program it will clearly describe to extend  array after initialization by creating an new array.

public class Main {
   public static void main(String[] args) {
      String[] names = new String[] { "A", "B", "C" };
      //Define array length

      String[] extended = new String[7];

    //extend new array

      extended[3] = "D";
      extended[4] = "E";
      extended[5] = "F";
      extended[6] = "G";
    //  check value and length 

      System.arraycopy(names, 0, extended, 0, names.length);
      for (String str : extended){
         System.out.println(str);
      }
   }
}




     output :  A
               B
               C
               D
               E
               F
               G