Learning Processing: A Beginner's Guide to Programming Images ...

Hint: Add a function that returns a boolean in the Particle class.
ArrayList particles
fi g. 23.4
_______ finished() {
}
if (_______) {
return _______;
} else {
}
return false;
C is removed....
Particle
A
Particle
B
Particle
C
Particle
D
0 1 2
3 4
Particle
E
size = 5 size = 4
Particle
A
Particle
B
Particle
D
Particle
E
0 1 2 3
Java 431
Exercise 23-2 : Rewrite Example 23-2 so that particles are removed from the list whenever
they leave the window (i.e., their y location is greater than height).
Hint: In order for this to work properly, you must iterate through elements of the ArrayList
backward! Why? Because when an element is removed, all subsequent elements are shifted to the
left (see Figure 23.4 ).
for (int i = _______; i _______; i_______) {
}
Particle p = (Particle) particles.get(i);
p.run();
p.gravity();
p.render();
if (_______) {
}
_______;