jdk自动 拆箱和自动装箱的性能

package com.mysoft.test.type.boxing;

/**
 * @Title: Autoboxing.java
 * @Package com.mysoft.test.type.boxing
 * @Description: TODO()
 * @author wwl
 * @date 2016年6月29日 下午5:06:26
 * @version V1.0
 */
public class Autoboxing {
	public static void main(String[] args) {
		autoboxing();
		unboxing();
	}

	/**
	 * 自动装箱
	 */
	public static void autoboxing() {
		long t = System.currentTimeMillis();
		Long sum = 0L;
		for (long i = 0; i < Integer.MAX_VALUE; i++) {
			//sum += new Long(i);//等同
			sum += i;
		}
		System.out.println("total:" + sum);
		System.out.println("processing time: " + (System.currentTimeMillis() - t) + " ms");
	}
	/**
	 *不是用自动装箱
	 */
	public static void unboxing() {
		long t = System.currentTimeMillis();
		long sum = 0L;
		for (long i = 0; i < Integer.MAX_VALUE; i++) {
			sum += i;
		}
		System.out.println("total:" + sum);
		System.out.println("processing time: " + (System.currentTimeMillis() - t) + " ms");
	}
	//jdk1.6
//	total:2305843005992468481
//	processing time: 67017 ms
//	total:2305843005992468481
//	processing time: 14518 ms
//	total:2305843005992468481
//	processing time: 68589 ms
//	total:2305843005992468481
//	processing time: 15100 ms
	//jkd1.7
//	total:2305843005992468481
//	processing time: 31885 ms
//	total:2305843005992468481
//	processing time: 3827 ms
//	total:2305843005992468481
//	processing time: 30350 ms
//	total:2305843005992468481
//	processing time: 3675 ms

}

使用装箱严重影响性能，idk8暂未测试