Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        ArrayList<Integer> ids = new ArrayList<>();

        int total = ids.size(); // total will be zero

        System.out.println("ArrayList size is  " + total);
        System.out.println("ArrayList elements are   " + ids);

        ids.add(new Integer(10)); // Adding an Integer object.
        ids.add(20); // Autoboxing
        ids.add(30); // Autoboxing

        total = ids.size(); // total will be 3

        System.out.println("ArrayList size is  " + total);
        System.out.println("ArrayList elements are   " + ids);

        ids.clear();

        total = ids.size(); // total will be 0
        System.out.println("ArrayList size is  " + total);
        System.out.println("ArrayList elements are   " + ids);
    }
}