ArrayList in Java

import java.util.ArrayList;

public class Program1 {

    public static void main(String[] args) {

        ArrayList<String> countries = new ArrayList<String>();
        countries.add("India");
        countries.add("USA");
        countries.add("China");
        countries.add("Russia");

        System.out.println(countries);
    }

}

🧾 Output:

[India, USA, China, Russia]

💡 What is an ArrayList?

• A resizable array in Java (from java.util package).

• Can store a list of objects (in this case, Strings).

• Allows dynamic addition, removal, and retrieval of items.

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🧠 Common Operations:

Operation	Example Code
Add an element	countries.add("Japan");
Get an element by index	countries.get(0); // India
Set (replace) an element	countries.set(1, "UK");
Remove an element	countries.remove("China");
Size of the list	countries.size();
Loop through elements (for-each)	for(String c : countries) {}

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🔁 Example: Looping through the list:

for (String country : countries) {


System.out.println("Country: " + country);


}