Math.random repeating itself

My code so far is working almost to how it should be working. The instructions are above the method. The only problem that I'm encountering is that Math.random(); repeats itself when called multiple times. I wanted to know if there was a solution to prevent the Math.random(); from repeating itself;

/**
 * Apply an "efficient selection shuffle" to the argument.
 * The selection shuffle algorithm conceptually maintains two sequences
 * of cards: the selected cards (initially empty) and the not-yet-selected
 * cards (initially the entire deck). It repeatedly does the following until
 * all cards have been selected: randomly remove a card from those not yet
 * selected and add it to the selected cards.
 * An efficient version of this algorithm makes use of arrays to avoid
 * searching for an as-yet-unselected card.
 * @param values is an array of integers simulating cards to be shuffled.   
 */
public static void selectionShuffle(int[] values) {
    ArrayList<Integer> temp=new ArrayList<Integer>();
    int size=52;
    for(int j=0;j<size;j++){
        /*int random=(int)(Math.random()*51);
        temp.add(random);
        values[j]=temp.get(j);*/
        int random=(int)(Math.random()*51);
        temp.add(values[random]);
        values[j]=temp.get(j);
    }
}