Performance test of hashmap and synch

HashTest.java

import java.util.HashMap;

public class HashTest {
    public static void main(String[] args) {
        HashMap<String, String> map = new HashMap<>();
        map.put("foo", "bar");
        long now = System.currentTimeMillis();
        for(int i = 0; i < 1e7; i++) {
            map.get("foo");
        }
        Object syncher = new Object();
        System.out.println("Unsynched version took " + (System.currentTimeMillis() - now) + "ms");
        now = System.currentTimeMillis();
        for(int i = 0; i < 1e7; i++) {
            synchronized(syncher) {
                map.get("foo");
            }
        }
        System.out.println("Synched version took " + (System.currentTimeMillis() - now) + "ms");
    }
}