如何获得java对象的内存地址，获得java对象,在java中内存中的对象

如何获得java对象的内存地址，获得java对象,在java中内存中的对象

在java中内存中的对象地址是可变的，所以获得的内存地址有可能会变化。要获得内存地址也只能通过Unsafe的方法来获得，如下代码片段：

package cn.outofmemory.test;import java.lang.reflect.Field;import sun.misc.Unsafe;public class Addresser{    private static Unsafe unsafe;    static    {        try        {            Field field = Unsafe.class.getDeclaredField("theUnsafe");            field.setAccessible(true);            unsafe = (Unsafe)field.get(null);        }        catch (Exception e)        {            e.printStackTrace();        }    }    public static long addressOf(Object o)    throws Exception    {        Object[] array = new Object[] {o};        long baseOffset = unsafe.arrayBaseOffset(Object[].class);        int addressSize = unsafe.addressSize();        long objectAddress;        switch (addressSize)        {            case 4:                objectAddress = unsafe.getInt(array, baseOffset);                break;            case 8:                objectAddress = unsafe.getLong(array, baseOffset);                break;            default:                throw new Error("unsupported address size: " + addressSize);        }               return(objectAddress);    }    public static void main(String... args)    throws Exception    {           Object mine = "Hi there".toCharArray();        long address = addressOf(mine);        System.out.println("Addess: " + address);        //Verify address works - should see the characters in the array in the output        printBytes(address, 27);    }    public static void printBytes(long objectAddress, int num)    {        for (long i = 0; i < num; i++)        {            int cur = unsafe.getByte(objectAddress + i);            System.out.print((char)cur);        }        System.out.println();    }}