arraylist-lambada-性能测试

package cn.com.one;import java.util.ArrayList;public class ttt {    public static void main(String [] args) {                new Thread(()->{            Thread.currentThread().setName("t2");            int k =0;            String test2 = "";            long startTime2 = System.currentTimeMillis();            ArrayList<Object> arrayList2= new ArrayList<>(10);            while(true){                k += 1;                test2 = "我是第"+k+"个";                arrayList2.add(test2);                if(k > 10000000)  break;            }            long overTime2 = System.currentTimeMillis();            System.out.println(Thread.currentThread().getName()+(overTime2 - startTime2) / 1000+"s");        }).start();//----------------------------------------------------------------------------------------------------        Runnable runnable =  ()->{            Thread.currentThread().setName("t1");            int j =0;            String test1 = "";            long startTime1 = System.currentTimeMillis();            ArrayList<Object> arrayList1 = new ArrayList<>(100);            while (true) {                j += 1;                test1 = "我是第" + j + "个";                arrayList1.add(test1);                if (j > 10000000) break;            }            long overTime1 = System.currentTimeMillis();            System.out.println(Thread.currentThread().getName()+(overTime1 - startTime1) / 1000 + "s");        };//----------------------------------------------------------------------------------------------------        Thread.currentThread().setName("tmain");        int i =0;        String test0 = "";        long startTime0 = System.currentTimeMillis();        ArrayList<Object> arrayList0= new ArrayList<>(1);        while(true){            i += 1;            test0 = "我是第"+i+"个";            arrayList0.add(test0);            if(i > 10000000)  break;        }        long overTime0 = System.currentTimeMillis();        System.out.println(Thread.currentThread().getName()+(overTime0 - startTime0) / 1000+"s");//----------------------------------------------------------------------------------------------------    }}