Test unsychronized Set implementations

SetsTest.java

private static final int COUNT = 1000000;

private static void testAdd(Set<String> set) {
    final long start = System.nanoTime();
    for (int i = 0; i < COUNT; ++i) {
        set.add("test" + Math.random());
    }
    final long elapsed = System.nanoTime() - start;
    System.out.println("testAdd: " + elapsed / 1000);
}

private static void testRemove(Set<String> set) {
    final long start = System.nanoTime();
    for (int i = 0; i < COUNT; ++i) {
        set.remove("test" + Math.random());
    }
    final long elapsed = System.nanoTime() - start;
    System.out.println("testRemove: " + elapsed / 1000);
}

private static void testContains(Set<String> set) {
    final long start = System.nanoTime();
    for (int i = 0; i < COUNT; ++i) {
        set.contains("test" + Math.random());
    }
    final long elapsed = System.nanoTime() - start;
    System.out.println("testContains: " + elapsed / 1000);
}

private static void testSize(Set<String> set) {
    final long start = System.nanoTime();
    for (int i = 0; i < COUNT; ++i) {
        set.size();
    }
    final long elapsed = System.nanoTime() - start;
    System.out.println("testSize: " + elapsed / 1000);
}

private static void testIterator(Set<String> set) {
    final long start = System.nanoTime();
    for (String item : set) {
        set.size();
    }
    final long elapsed = System.nanoTime() - start;
    System.out.println("testIterator: " + elapsed / 1000);
}

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    //Some unnecessary ops
    for (int i = 0; i < COUNT; ++i) {
        Math.random();
    }
   
    Set<String> set = new HashSet<String>();
    System.out.println("**************************");
    System.out.println("Test HashSet");
    testAdd(set);
    testContains(set);
    testSize(set);
    testIterator(set);
    testRemove(set);

    set = new LinkedHashSet<String>();
    System.out.println("**************************");
    System.out.println("Test LinkedHashSet");
    testAdd(set);
    testContains(set);
    testSize(set);
    testIterator(set);
    testRemove(set);

    set = new TreeSet<String>();
    System.out.println("**************************");
    System.out.println("Test TreeSet");
    testAdd(set);
    testContains(set);
    testSize(set);
    testIterator(set);
    testRemove(set);
}