How can I make a copy of my 2D array of randomly generated letters?

I'm trying to make a copy of my 2D array with reference variable alphabet in my WordSearch class and then print both out to the console. I was able to print out the first array with reference variable alphabet inside of the search() method in WordSearch class but when I call that method inside my getLetters() method in the WordSearch class I get two new arrays that are copies of each other inside the console. Can somebody tell me why I can't get this to work? Thank you for taking a look.

import java.util.Scanner;
import java.util.Random;

public class WordSearchTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        int seed;
        String word = " ";
        String again = "y";
        char[] newWord = null;      

        Scanner keyboard = new Scanner(System.in);

        System.out.print("Enter a number from 1 - 9999:\n");
        seed = keyboard.nextInt();
        keyboard.nextLine();       //Consume the remaining new line
        while(seed < 1 || seed > 9999) {
            System.out.print("You must choose a number between 1 and    9999:\n");
            seed = keyboard.nextInt();
            keyboard.nextLine();   //Consume the remaining new line
        }

        while(again.equalsIgnoreCase("y")) {
            System.out.print("Enter a word to search for on the word search board:\n");
            word = keyboard.nextLine();
            newWord = word.toCharArray();
            System.out.print("Would you like to search for another word? (Y = Yes and N = No)\n");
            again = keyboard.nextLine();
            while(!again.equals("Y") && !again.equals("y") && !again.equals("N") && !again.equals("n")) {
                System.out.print("Invalid response. Y or N?\n");
                again = keyboard.nextLine();
                }
            }

        char[][] letters = new char[4][4];

        WordSearch puzzles = new WordSearch(seed, newWord, letters);

        puzzles.search();

        System.out.println();

        puzzles.getLetters();

        System.out.print("\nTerminating...");
        System.exit(0);

    }

}








import java.util.Random;

 */
public class WordSearch {

    private int seedNum;
    private char randChars;
    private char[] wordArray;
    private char[][] lettersFound;
    private char[][] alphabet;

    public WordSearch(int seeded, char[] wordA, char[][] alpha) {
        seedNum = seeded;
        wordArray = wordA;
        alphabet = alpha;
    }

    public char[][] search() {
        for(int rowz = 0; rowz < alphabet.length; rowz++)
        {   
            System.out.print("+---+ " + "+---+ " + "+---+ " + "+---+\n");
            for(int col = 0; col < alphabet[0].length; col++)
            {
                Random rand = new Random(seedNum);
                char someChar = (char)(rand.nextInt(26) + 65);
                alphabet[rowz][col] = someChar;
                System.out.print("| " + alphabet[rowz][col] + " | ");
                seedNum += 26;
            }
            System.out.print("\n+---+ " + "+---+ " + "+---+ " + "+---+\n");
        }
        return alphabet;
    }

    public void getLetters() {
        lettersFound = search();
        for(int rowz = 0; rowz < alphabet.length; rowz++)
        {   
            System.out.print("+---+ " + "+---+ " + "+---+ " + "+---+\n");
            for(int col = 0; col < alphabet[0].length; col++)
            {
                System.out.print("| " + lettersFound[rowz][col] + " | ");
            }
            System.out.print("\n+---+ " + "+---+ " + "+---+ " + "+---+\n");
        } 
    }

}