Java使用JVM堆外内存

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 } } } }