Survival wave game

[beijct]

Hi all, I'm making a simple wave based survival game for a programming class and I'm having a bit of trouble, heres some background: I've chosen Velociraptors as my basic attacker in the game i.e. what you need to kill to advance to the next wave, and of stuffed a bunch of them into an array, what I want is to spawn the second wave after the first is completely eliminated, heres my code to do so:

this initiates the first wave:

for (int i=0; i<5; i++)
			{
				if(raptors[i].isAlive==true)
					{
						g.drawImage(raptorPic,raptors[i].xpos,raptors[i].ypos,this);
					}
			}

for (int i=0; i<5; i++)
				{
					if(raptors[i].isAlive==true)
						{
							raptors[i].move();
						}
				}

this is supposed to initiate the second wave

for (int i=0; i<5; i++)//draw wave 2
			{
				for (int x=5; x<15; x++)
				{
					if(raptors[i].isAlive==false&&raptors[x].isAlive==true)
					{	
						g.drawImage(raptorPic,raptors[x].xpos,raptors[x].ypos,this);
					}
				}
			}//end of draw wave 2

for (int i=0; i<5; i++)//move wave 2
			{
				for (int x=5; x<15; x++)
				{
					if(raptors[i].isAlive==false&&raptors[x].isAlive==true)
					{						
						raptors[x].move();
					}
				}
			}//end of move wave 2

The problem is after a single raptor from the first wave dies, the second wave is instantly drawn and moved, obviously I need every object in the first wave to die before the second wave spawns, any help would be appreciated, thanks in advance.

[Junky]

Use a List instead of an array. When a raptor is killed remove it from the List. When the List is empty call the second wave.

[beijct]

That sounds a lot simpler than my array, unfortunately, I have no idea how to use a list, and although I'm sure I could easily find a guide online, I need an array in the game as a requirement for my project.

[Junky]

In that case loop over the array and check if each raptor is alive. If you find one that is alive DON'T initiate the second wave. This would be best done in a method that returns a boolean.