public class ArrayExample {

	
	// return an array 
	public static int[] createArray(){
		int[] binary = new int[8];
		int product=1;
		for (int i=0; i < binary.length; i++) {
			binary[i] = product;
			product = 2 * product;
		}
		return binary;
	}
	
	// take an array as a parameter 
	public static void displayArray(int[] numbers){
		for (int i=0; i < numbers.length; i++) {
			System.out.println(numbers[i]);
		}
	}
	
	// swap method shows that array is pass by value
	// changes to array apply to method arguments
	public static void swap(int[] pList, int i, int j){
		int temp = pList[i];
		pList[i] = pList[j];
		pList[j] = temp;
	}
	
	public static void main(String[] args) {

		// how to use arrays in methods 
		
		int[] list;
		list = createArray();	// returns an array, assigned to list
		displayArray(list);		// list is argument to displayArray
		
		System.out.println("--------------");
		// swap items (same result regardless of index order)
		swap(list, 0, 5);
		displayArray(list);	
		
		
	}

}