import java.util.Random;

public class ArrayShuffler{

public static void main(String[] args){

Integer[] array = generateFixedRandomArray(30);

shuffleArray(array);

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

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

}

}

static Integer[] generateFixedRandomArray(int length){

long mySeed = 56L;

Random random = new Random(mySeed); // Same seed get same sequence.

Integer[] array = new Integer[length];

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

array[i] = random.nextInt(10); // 0-9

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

}

System.out.println();

return array;

}

// "Cannot Instantiate Generic Types with Primitive Types" from Java Documentation. T can not represent int .etc

static <T> void shuffleArray(T[] array){

Random random = new Random();

for(int i =0;i<array.length;i++){ // Random time can not be exactly array.length.

int n = random.nextInt(array.length);

// swap element.

T temp = array[i];

array[i] = array[n];

array[n] = temp;

}

}

}