gistfile1.txt

import java.util.ArrayList;
import java.util.List;

import junit.framework.Assert;
import junit.framework.TestCase;

public class MapTest2 extends TestCase {

	private static final FilterImpl staticFilter = new FilterImpl();

	public void testFoo() {
		List<Integer> list = this.makeList();
		Assert.assertEquals(4, list.size());

		long staticTime = 0;
		long instanceTime = 0;
		long inlineTime = 0;

		for (int j = 0; j < 100; j++) {
			long a = System.nanoTime();
			for (int i = 0; i < 1000000; i++) {
				doStatic(list);
			}
			long b = System.nanoTime();
			staticTime += (b - a);

			long c = System.nanoTime();
			for (int i = 0; i < 1000000; i++) {
				doNonStatic(list);
			}
			long d = System.nanoTime();
			instanceTime += (d - c);
			
			long e = System.nanoTime();
			for (int i = 0; i < 1000000; i++) {
				doInline(list);
			}
			long f = System.nanoTime();
			inlineTime += (f - e);
		}

		System.out.println("static: " + staticTime);
		System.out.println("instan: " + instanceTime);
		System.out.println("inline: " + inlineTime);
	}
	
	private void doInline(List<Integer> list) {
		List<Integer> list2 = new ArrayList<Integer>();
		for (Integer i : list) {
			if (i.intValue() == 3) {
				list2.add(i);
			}
		}
		Assert.assertEquals(1, list2.size());
	}

	private void doStatic(List<Integer> list) {
		List<Integer> list2 = filter(list, staticFilter);
		Assert.assertEquals(1, list2.size());
	}

	private void doNonStatic(List<Integer> list) {
		List<Integer> list2 = filter(list, new FilterImpl());
		Assert.assertEquals(1, list2.size());
	}

	private List<Integer> makeList() {
		List<Integer> list = new ArrayList<Integer>();
		list.add(1);
		list.add(2);
		list.add(3);
		list.add(4);
		return list;
	}

	public interface Filter {
		boolean filter(Integer i);
	}

	public List<Integer> filter(List<Integer> list, Filter filter) {
		List<Integer> list2 = new ArrayList<Integer>();
		for (Integer i : list) {
			if (filter.filter(i)) {
				list2.add(i);
			}
		}
		return list2;
	}

	public static class FilterImpl implements Filter {
		public boolean filter(Integer i) {
			return i.intValue() == 3;
		}
	}
	
}