Java使用JVM堆外内存

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package com.company;import sun.misc.Unsafe;/** * Created by yellowboy on 2017/3/9. */public class Main3 {    public static void main(String[] args) throws Exception {        Integer[] a = new Integer[]{1, 2, 3, 4, 5, 7, 9, 888, 8, 102};//给定一个整形数组        final int length  = a.length ;        final Unsafe unsafe = UnsafeUtil.getUnsafe();//获取unsafe对象用于分配内存        final long addr[] = new long[length];//定义addr数组记录整形数组每个值存储的位置        try {            for(int i = 0 ;i < length ; i++ )            {                addr[i] = unsafe.allocateMemory(Integer.SIZE);//分配一个Integer的大小的内存                unsafe.putInt(addr[i],a[i]);//把数字放在地址空间上            }            a = null;            for(int i = 0 ;i < length ; i++ )            {                System.out.println(unsafe.getInt(addr[i]));//输出每个地址空间的值            }        } finally {            for(int i = 0 ;i < length ; i++ )            {                unsafe.freeMemory(addr[i]);//释放每个地址空间            }        }    }}

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