Test Java collection performance against set operations with various input characteristics

ListSetTest.java

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.TreeSet;

public class ListSetTest {
	
	public static void main(String[] args) {
		
		int opcount = 900000;
		
		Params[] paramss = new Params[]{
				new Params(1, opcount, 4, ""),
				new Params(5, opcount, 4, ""),
				new Params(500, opcount, 4, ""),
				new Params(50, opcount, 4, "dfskgjhsdfkghsdklfghsdlkfghsdlkfghsdlkfghsdlfkh"),
				new Params(50, opcount, 4, new String(new char[100]).replace("\0", "aloha")),
				new Params(50, opcount, 2, ""),
				new Params(50, opcount, 20, ""),
		};
		
		for (Params params : paramss) {
			
			System.out.println("\n"+params);
			
			int different = params.different;
			int operations = params.operations;
			int base = params.base;
			String pad = params.pad;
			
			List<Collection<String>> collections =  new ArrayList<Collection<String>>(3);
			collections.add(new ArrayList<String>());
			collections.add(new HashSet<String>());
			collections.add(new TreeSet<String>());
			
			String[] strings = new String[different];
			for(int i = 0; i < strings.length; i++) {
				strings[i] = pad + Integer.toString(i, base);
			}
			
			for(Collection<String> collection : collections) {
				
				System.out.print(String.format("%25s",collection.getClass().getCanonicalName())+": ");
				long start = System.nanoTime();
				
				for(int i = 0; i < operations; i++) {
					String s = strings[i%different];
					if(!collection.contains(s))
						collection.add(s);
				}
				
				long end = System.nanoTime();
				System.out.println(String.format("%,13d", end-start));
				
				if(collection.size() != strings.length)
					throw new RuntimeException(collection.size()+" vs "+strings.length);
			}
		}
	}
	
	private static class Params {
		private int different = 50;
		private int operations = 1000;
		private int base = 4;
		private String pad = "";
		public Params(int different, int operations, int base, String pad) {
			this.different = different;
			this.operations = operations;
			this.base = base;
			this.pad = pad;
		}
		@Override
		public String toString() {
			return "Params [different=" + different + ", operations="
					+ operations + ", base=" + base + ", pad=" + pad + "]";
		}
	}
	
}

output.txt

Params [different=1, operations=900000, base=4, pad=]
      java.util.ArrayList:    44.975.269
        java.util.HashSet:    45.535.117
        java.util.TreeSet:    60.807.449

Params [different=5, operations=900000, base=4, pad=]
      java.util.ArrayList:    67.473.101
        java.util.HashSet:    57.660.121
        java.util.TreeSet:    85.644.684

Params [different=500, operations=900000, base=4, pad=]
      java.util.ArrayList: 2.850.017.810
        java.util.HashSet:    46.634.977
        java.util.TreeSet:   256.601.049

Params [different=50, operations=900000, base=4, pad=dfskgjhsdfkghsdklfghsdlkfghsdlkfghsdlkfghsdlfkh]
      java.util.ArrayList: 1.974.526.372
        java.util.HashSet:    48.995.054
        java.util.TreeSet:   781.946.030

Params [different=50, operations=900000, base=4, pad=alohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaalohaaloha]
      java.util.ArrayList: 17.068.582.738
        java.util.HashSet:    47.704.387
        java.util.TreeSet: 6.492.455.885

Params [different=50, operations=900000, base=2, pad=]
      java.util.ArrayList:   317.699.875
        java.util.HashSet:    42.788.958
        java.util.TreeSet:   178.698.410

Params [different=50, operations=900000, base=20, pad=]
      java.util.ArrayList:   316.145.488
        java.util.HashSet:    41.882.418
        java.util.TreeSet:   127.896.143