I need to write a java statement that will play “hello.wav” when the up arrow key is pressed but I'm not sure where to start since I've never used the arrow keys in a program. Please help!
I do know I need to write Greenfoot.playSound("hello.wav");
HTown_Diva wrote ...
2015/4/27
Using the arrow keys to play a music file
if(Greenfoot.isKeyDown("up"))
{
...
}if(Greenfoot.getKey().compareTo("up") == 0)
{
...
}
public void act()
{
if(Greenfoot.isKeyDown("up")
Greenfoot.playSound("hello.wav");
}
please first learn the example that available everywhere including in this website
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Yes, lordhershey (and @azazeel as well), the sould will play on top of itself many times with 'if (... isKeyDown...)' -- unless you back it up with another condition (like using a boolean that tracks the current state of the key).
@lordhershey, your second attempt will fail because you will be calling 'compareTo' on a 'null' value (until the key is pressed and released -- but, the error will occur immediately upon starting the scenario). Better to use the following:
as the String value, "up", will never be null and you can call 'equals' on it forever without any problems.
if ("up".equals(Greenfoot.getKey()))Hi Dan, I believe CompareTo is used correctly Java SE 7 String Class , returns 0 if the stings are the same, the function can return -1, 0, or 1.
Oh I think I misunderstood - Greenfoot.getKey() can be null thus calling compareTo on it would cause an exception.
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