java 基本数据类型跟封装类型的差距

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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<Integer.MAX_VALUE;i++){

		sum2+=1;

	}

	System.out.println(sum2);

	long end2 = System.currentTimeMillis();

	System.out.println(end2-start2);

}

}