How to remove duplicate rows from matrix

 I want to remove duplicate rows from a matrix. I read How can I remove duplicates in an array but keep the same order?, but this is not exactly what I want.

The solution above removes duplicate values (cells) from matrix (and returns a vector), but I need to remove duplicate rows and return a matrix — the same matrix without duplicate rows.

Example:  

a = [1,2; 3,4; 5,6; 1,2; 7,8]

a =
     1     2
     3     4
     5     6
     1     2
     7     8

%...

ans =
     1     2
     3     4
     5     6
     7     8 

The order doesn't matter.  

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Answers: 
See http://www.mathworks.com/help/techdoc/ref/unique.html
b = unique(A, 'rows') returns the unique rows of A. 
Here is my solution 
 
package com.test;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

public class DuplicateInMatrix {
    public static void main(String[] args) {
        Integer[][] arr = { { 1, 2, 3 }, { 4, 5, 6 }, { 1, 2, 3 } };
        Set set = new HashSet<>();
        for (int i = 0; i < arr.length; i++) {
            set.add(new Element(arr.length, arr[i]));
        }

        buildResultArray(set);
 
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