Hi, can anyone please share me an example of for each loop. I'm having a problem with it. Thank you
bishal52 wrote ...
2017/9/28
For each loop
A for each loop just iterates through a list of objects to perform actions on some or all of them. It may also be that no specific type was found and so no actions were actually performed. As an example, the list might be all Ball objects that intersect an actor and each must animate by changing colors continuously while intersecting the actor. It would be a behavior of a Ball object to change colors, so a method in the Ball class should be constructed to perform that duty, let us call it 'agitateColor()'. The actor could then have a method called 'agitateBalls()' which would look like this:
In simpler form, it might look like this:
Or, broken down even more, like this:
Now, let us say that there are Box objects also and when intersecting the actor, they would oscillate in size. Then, it could be done like this:
1 2 3 4 | private void agitateBalls(){ for (Ball ball : (List<Ball>)getIntersectingObjects(Ball.class)) ball.agitateColor();} |
1 2 3 4 | private void agitateBalls(){ for (Object obj : getIntersectingObjects(Ball.class)) ((Ball)obj).agitateColor();} |
1 2 3 4 5 6 7 8 | private void agitateBalls(){ for (Object obj : getIntersectingObjects(Ball.class)) { Ball ball = (Ball)obj; ball.agitateColor(); }} |
1 2 3 4 5 6 7 8 | private void agitateIntersectors(){ for (Object obj : getIntersectingObjects(Actor.class)) { if (obj instanceof Ball) ((Ball)obj).agitateColor(); if (obj instanceof Box) ((Box)obj).agitateSize(); }} |
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