Java - Map

import java.util.HashMap;
import java.util.Hashtable;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.TreeMap;

public class Test {

final static int LOOP_COUNT = 1000;
final static String STR_DATA = "abcdefghijklmnopqrstuvwxyz";
static Map<Integer, String> map;

public static void main(String[] args) {
warmUp();

map = new Hashtable<Integer, String>();

showUsedTime();

map = new HashMap<Integer, String>();

showUsedTime();

map = new LinkedHashMap<Integer, String>();

showUsedTime();

map = new TreeMap<Integer, String>();

showUsedTime();
}

private static void warmUp() {
map = new HashMap<Integer, String>();

for (int i = 0; i < LOOP_COUNT; i++) {
map.put(i, STR_DATA);
}
}

private static void showUsedTime() {
long startTime = System.nanoTime();

for (int i = 0; i < LOOP_COUNT; i++) {
map.put(i, STR_DATA);
}

long endTime = System.nanoTime();
double elaspedTime = (endTime - startTime) / 1000000.0;

System.out.println("Put Time: " + elaspedTime);

startTime = System.nanoTime();

for (int i = 0; i < LOOP_COUNT; i++) {
map.get(i);
}

endTime = System.nanoTime();
elaspedTime = (endTime - startTime) / 1000000.0;

System.out.println("Get Time: " + elaspedTime);
}
}