ERROR: This method must return a result of type int

Question

Code:

import java.util.*;

public class shuffleDeck
{ 
    public static int shuffleDeck (int[] deck, int theNumber)
    {
        int [] array1         


        

Answer 1

Uppercase the name of your class to distinguish between class and method:

public class ShuffleDeck {
...

Perhaps it is even better to rename the method:

public static int doTheShuffle(int[] deck, int theNumber) {

If you want the function to return something sensible put the return out of the loop:

for (int i = deck.length, j, tmp; i > 1; i--) {
    j = random.nextInt(i);

    tmp = deck[i - 1];
    deck[i - 1] = deck[j];
    deck[j] = tmp;
}

return theNumber;

But all of this will only make the compiler not complain about syntax errors. Your algorithm still has bugs.