AP® Computer Science A glossary
ArrayList methods
Course: AP® Computer Science A Shows up in: Unit 4: Data Collections
The Java Quick Reference ArrayList methods: size, add(obj), add(index, obj), get, set and remove; add and remove at an index shift later elements.
Appears in the course and exam description (CED): 4.8.A.5
add(index, obj) moves later elements right (size + 1); remove(index) moves them left (size - 1) and returns the removed element; set returns the element it replaced.
ArrayList<String> q = new ArrayList<String>();
q.add("A");
q.add("C");
q.add(1, "B");
String old = q.set(2, "D");
System.out.println(q + " " + old);
String gone = q.remove(0);
System.out.println(gone + " " + q);Output:
[A, B, D] C
A [B, D]