Map<Double,Double> Tester

main.java

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
public class main {
	public static int NumOfQ = 5000000;
	public static void main(String[] args) {
		Map<Integer, Integer> x = new TreeMap<Integer, Integer>();
		System.out.println("Warming up..");
		warmup(x);
		x = new ConcurrentHashMap<Integer, Integer>();
		warmup(x);
		x = new HashMap<Integer, Integer>();
		warmup(x);
		x = new LinkedHashMap<Integer, Integer>();
		warmup(x);
		x = new Hashtable<Integer, Integer>();
		warmup(x);
		// END WARMUP
		System.out.println("Starting..");
		x = new TreeMap<Integer, Integer>();
		test(x);
		x = new ConcurrentHashMap<Integer, Integer>();
		test(x);
		x = new HashMap<Integer, Integer>();
		test(x);
		x = new LinkedHashMap<Integer, Integer>();
		test(x);
		x = new Hashtable<Integer, Integer>();
		test(x);
	}

	public static void warmup(Map<Integer, Integer> x) {
		for (int i = 0; i < NumOfQ; i++) {
			x.put(i, i);
		}
		int Temp1 = 0;
		for(int i = 0;i<x.size();i++) {
			Temp1 = x.get((int) Math.random() * ((x.size()-1) - 0 + 1) + 0);
		}
	}

	public static void test(Map<Integer, Integer> x) {
		// WRITE TEST SECTION
		long FirstWriteTime = System.nanoTime() / 1000000;
		for (int i = 0; i < NumOfQ; i++) {
			x.put(i, i);
		}
		long SecondWriteTime = (System.nanoTime() / 1000000) - FirstWriteTime;

		int Temp1 = 0;
		
		// READ TEST SECTION
		long FirstReadTime = System.nanoTime() / 1000000;
		for(int i = 0;i<x.size();i++) {
			Temp1 = x.get((int) Math.random() * ((x.size()-1) - 0 + 1) + 0);
		}
		long SecondReadTime = (System.nanoTime() / 1000000) - FirstReadTime;
		// OUTPUT
		System.out.println(x.getClass() + " | " + "Write: " + SecondWriteTime + " ms | " + "Read: " + SecondReadTime + " ms");
	}
}