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Computing with Data

elgeish
31.3K views
Previous: Generics Next: HashMap

ArrayList

import java.util.ArrayList;
public class ArrayListExample {
public static void main(final String[] args) {
final ArrayList<Double> a = new ArrayList<>();
// Insert three elements
a.add(1.0);
a.add(3.0);
a.add(2.0);
// Traverse collection and print elements
for (final double d : a) {
System.out.print(d + " ");
}
System.out.println();
a.set(1, 3.5); // modify 2nd element
// Print 2nd element (random access)
System.out.println(a.get(1));
// Traverse collection and print elements
for (final double d : a) {
System.out.print(d + " ");
}
System.out.println();
}
}
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