Java - Unir o Combinar dos Matrices

public class MergeMatrix {

	public static void main(String[] args) {

	    char[][] mat1 = {{'0','0','0','0'},{'0','0','0','0'},{'a','0','e','0'},{'v','n','0','0'}};

	    System.out.println("Matriz 1");

	    printMatrix(mat1);

		char[][] mat2 = {{'*','*','0','0'},{'*','0','0','0'},{'0','*','0','0'},{'0','0','0','0'}};

		System.out.println("Matriz 2");

		printMatrix(mat2);

		char[][] matMerged = mergeMatrix(mat1, mat2);

		System.out.println("Merge");

		printMatrix(matMerged);

	}

	private static char[][] mergeMatrix(char[][] mat1, char[][] mat2) {

		char[][] matMerged = new char[mat1.length][mat1[0].length];

		final int ZERO = '0';

		int result = 0;

		for(int i = 0 ; i < mat1.length ; i++) {

			for(int j = 0 ; j < mat1[i].length ; j++) {

				result = 0;

				if(ZERO != mat1[i][j])

					result |= mat1[i][j];

				if(ZERO != mat2[i][j])

					result |= mat2[i][j];

				matMerged[i][j] = (0==result) ? '0' : (char)result;

			}

		}

		return matMerged;

	}

	private static void printMatrix(char[][] mat) {

		for(int i = 0 ; i < mat.length ; i++) {

			for(int j = 0 ; j < mat[i].length ; j++) {

				System.out.print(mat[i][j]+" ");

			}

			System.out.println();

		}

	}

}