import java.util.*;

class test1{

public static void main(String[] args){

long start1 = System.currentTimeMillis();

Long sum = 0l;

for(long i = 0;i<Integer.MAX_VALUE;i++){

sum+=1;

}

System.out.println(sum);

long end1 = System.currentTimeMillis();

System.out.println(end1-start1);

long start2 = System.currentTimeMillis();    long sum2 = 0l;    for(long i = 0;i

}

基本类型更可靠