package com.test;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.Random;
public class Test1 {
public static void main(String[] args) {
//测试:数组和集合的效率
//数组耗时
long ctm1= System.currentTimeMillis();
int[] arr=new int[1000000];
for (int i = 0; i < arr.length; i++) {
arr[i]=i;
}
long ctm2=System.currentTimeMillis();
System.out.println("数组耗时:"+(ctm2-ctm1));
//集合耗时
ctm1=System.currentTimeMillis();
List<Integer> arrIntegers=new ArrayList<Integer>();
for (int i = 0; i < arr.length; i++) {
arrIntegers.add(i);
}
ctm2=System.currentTimeMillis();
System.out.println("集合耗时:"+(ctm2-ctm1));
}
}
