Java — ArrayList

Create ArrayList

import java.util.ArrayList;

ArrayList<String> list = new ArrayList<>();

Add elements

list.add("Alice");
list.add("Bob");
list.add(0, "Charlie");  // Insert at index

Access elements

String first = list.get(0);
int size = list.size();

Remove elements

list.remove("Bob");
list.remove(0);

Iterate

for (String name : list) {
    System.out.println(name);
}

Mini Practice

1. Create ArrayList
2. Add/remove elements
3. Access by index
4. Iterate through list

Up Next

Continue with HashMap - Key-value pairs.