Quick Test for reflection vs. new vs. cached

Main.java

package com.marqeta.mqpay;

import java.util.HashMap;
import java.util.Map;

public class Main {

    public static void main(String[] args) {
        System.out.println("via Reflection took " + instantiateViaReflection() + " milliseconds");
        System.out.println("via New took " + instantiateAsNew() + " milliseconds");
        System.out.println("via Reflection with cache took " + instantiateViaReflectionWithCache() + " milliseconds");

    }


    public static long instantiateViaReflection(){
        long start = System.currentTimeMillis();
        try {
            for(int i = 0;i<1000000;i++){
                Class clss = Class.forName("com.marqeta.mqpay.TestClass");
                TestClass instance = (TestClass) clss.newInstance();
                instance.someMethod();
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        return System.currentTimeMillis() - start;
    }

    public static long instantiateAsNew(){
        long start = System.currentTimeMillis();
        try {
            for(int i = 0;i<1000000;i++){
                TestClass instance = new TestClass();
                instance.someMethod();
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        return System.currentTimeMillis() - start;
    }

    public static long instantiateViaReflectionWithCache(){
        long start = System.currentTimeMillis();
        Map<String, Object> cache = new HashMap();
        try {
            for(int i = 0;i<1000000;i++){
                if(cache.containsKey("com.marqeta.mqpay.TestClass")){
                    ((TestClass)cache.get("com.marqeta.mqpay.TestClass")).someMethod();
                }else{
                    Class clss = Class.forName("com.marqeta.mqpay.TestClass");
                    TestClass instance = (TestClass) clss.newInstance();
                    cache.put("com.marqeta.mqpay.TestClass",instance);
                    instance.someMethod();
                }
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        return System.currentTimeMillis() - start;
    }
}


class TestClass{

    public long someMethod(){
        return System.currentTimeMillis()%10;
    }

}