Spartan Java

import java.util.ArrayList;
import java.util.Collection;
import java.util.TreeSet;
import org.apache.commons.lang.RandomStringUtils;
 
/**
 * @author Ricardo Zuasti
 */
public class Test {
 
    public static void main(String[] args) {
        final int ITERATIONS = 50000;
 
        // ArrayList
        ArrayList arrayList = new ArrayList();
        insert(arrayList, ITERATIONS);
        lookup(arrayList, ITERATIONS);
 
        // TreeSet
        TreeSet treeSet = new TreeSet();
        insert(treeSet, ITERATIONS);
        lookup(treeSet, ITERATIONS);
    }
 
    private static void insert(Collection col, int qty){
        long startStamp = System.currentTimeMillis();
 
        for (int i=0; i<qty; i++){
            col.add(RandomStringUtils.randomAlphanumeric(10));
        }
 
        long time = System.currentTimeMillis() - startStamp;
 
        System.out.println("Took " + time + " ms to insert " + qty + " to " + col.getClass().getName());
    }
 
    private static void lookup(Collection col, int qty){
        long startStamp = System.currentTimeMillis();
 
        for (int i=0; i<qty; i++){
            col.contains("searchme");
        }
 
        long time = System.currentTimeMillis() - startStamp;
 
        System.out.println("Took " + time + " ms to perform " + qty + " look-ups using " + col.getClass().getName());
    }
 
}