ArrayListDriver.java

import java.util.*;
import java.io.*;

public class ArrayListDriver {
    public static void main (String[] args) {

    /*Classwork
        ArrayList<String> a = new ArrayList<String>();
        ArrayList<String> b = new ArrayList<String>();
        long start, end, difference;
        int count = 1000000;

        System.out.println("Adding: " + count);

        start = System.currentTimeMillis();
        for (int i = 0; i <= count; i++) {
            a.add("x");
        }
        end = System.currentTimeMillis();
        difference = end - start;
        System.out.println("Adding from end: " + difference);

        start = System.currentTimeMillis();
        for (int i = 0; i <= count; i++) {
            b.add(0, "x");
        }
        end = System.currentTimeMillis();
        difference = end - start;
        System.out.println("Adding at beginning: " + difference);


        System.out.println("Removing: " + count);

        start = System.currentTimeMillis();
        for (int i = 0; i <= count; i++) {
            a.remove(0);
        }
        end = System.currentTimeMillis();
        difference = end - start;
        System.out.println("Removing from beginning: " + difference);

        start = System.currentTimeMillis();
        for (int i = 0; i <= count; i++) {
            b.remove(b.size() - 1);
        }
        end = System.currentTimeMillis();
        difference = end - start;
        System.out.println("Removing from end: " + difference);
	
	RESULTS
           Adding: 100000
           Adding from end: 21
           Adding at beginning: 2839
           Removing: 100000
           Removing from beginning: 2691
           Removing from end: 1

           Adding: 10000
           Adding from end: 2
           Adding at beginning: 49
           Removing: 10000
           Removing from beginning: 50
           Removing from end: 3

           Adding: 1000
           Adding from end: 0
           Adding at beginning: 1
           Removing: 1000
           Removing from beginning: 0
           Removing from end: 0
    }
    */

        ArrayList<Integer> a = new ArrayList<Integer>();
        ArrayList<Integer> temp = new ArrayList<Integer>();
        int count = 10;

        for (int i = 0; i < count; i++) {
            a.add(i);
        }
	System.out.println("Array: " + a.toString());

	for (int i = 0; i < count; i++){
	    int j = i + 1;
	    temp.add(a.get(count - j));
	}
	a = temp;
        System.out.println("Reversed: " + a.toString());
    }
}