How to set randomized numbers to appear once

hello everyone. I'm trying to create a program on java in which i have assigned 26 values to the numbers 1 through 26. the thing is im not sure how to get these values to show up once ive randomized them and to not repeat.
any help would be greatly appreachiated.

int[] randomNumbers; //your 26 numbers
java.util.Random rand = new Random();
public void shuffle(){
shuffleAmount = 100; //how much you want to shuffle
for(int i = 0; i<shuffleAmount; i++){
int a = rand.nextInt(randomNumbers.length);
int b = rand.nextInt(randomNumbers.length);
swap(a,b);
public void swap(int a, int b){
int temp = randomNumbers[a];
randomNumbers[a] = randomNumbers;
randomNumbers[b] = temp;

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