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// These are code fragments that show how to use an ArrayList.
// They won't compile because they assume the existence of a Particle class.
// Declaring the ArrayList, note the use of the syntax "<Particle>" to indicate
// our intention to fill this ArrayList with Particle objects
ArrayList<Particle> particles = new ArrayList<Particle>();
// Objects can be added to an ArrayList with add()
particles.add(new Particle());
// Particles can be pulled out of an ArrayList with get()
Particle part = particles.get(0);
part.display();
// The size() method returns the current number of items in the list
int total = particles.size();
println("The total number of particles is: " + total);
// You can iterate over an ArrayList in two ways.
// The first is by counting through the elements:
for (int i = 0; i < particles.size(); i++) {
Particle part = particles.get(i);
part.display();
}
// The second is using an enhanced loop:
for (Particle part : particles) {
part.display();
}
// You can delete particles from an ArrayList with remove()
particles.remove(0);
println(particles.size()); // Now one less!
// If you are modifying an ArrayList during the loop,
// then you cannot use the enhanced loop syntax.
// In addition, when deleting in order to hit all elements,
// you should loop through it backwards, as shown here:
for (int i = particles.size() - 1; i >= 0; i--) {
Particle part = particles.get(i);
if (part.finished()) {
particles.remove(i);
}
}
]]></code>
</example>
<description><