Using array of images to spawn enemies in game

Processing Beginners
6

You can use:
ArrayList<PImage> images = new ArrayList<PImage>();

However, you really should create an Enemy class.

class Enemy{
float x,y;
Enemy(){
//Constructor
}
void show(){
//show image
}
}

Then, just create an ArrayList of Enemies.
ArrayList<Enemy> enemies = new ArrayList<Enemy>();

You should have a Player class too.