java打印出内存地址 java 输出对象内存地址

import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
import sun.misc.Unsafe;  
import java.util.Collections;  
import java.lang.reflect.Field; 
public static void main(String[] args) {
		String a = new String("123"); String b = new String("123");
		
		System.out.println(getAddresses(a));
		System.out.println(getAddresses(b));
	}
	 public static String getAddresses(Object... objects)  
	    {  
	        StringBuffer sb = new StringBuffer();  
	        sb.append("0x");  
	        // sun.arch.data.model=32 // 32 bit JVM  
	        // sun.arch.data.model=64 // 64 bit JVM  
	        boolean is64bit = Integer.parseInt(System.getProperty("sun.arch.data.model")) == 32 ? false : true;  
	        Unsafe unsafe = getUnsafe();  
	        long last = 0;  
	        int offset = unsafe.arrayBaseOffset(objects.getClass());  
	        int scale = unsafe.arrayIndexScale(objects.getClass());  
	        switch (scale)  
	        {  
	            case 4:  
	                long factor = is64bit ? 8 : 1;  
	                final long i1 = (unsafe.getInt(objects, offset) & 0xFFFFFFFFL) * factor;  
	                // 输出指针地址  
	                sb.append(Long.toHexString(i1));  
	                last = i1;  
	                for (int i = 1; i < objects.length; i++)  
	                {  
	                    final long i2 = (unsafe.getInt(objects, offset + i * 4) & 0xFFFFFFFFL) * factor;  
	                    if (i2 > last)  
	                        sb.append(", +" + Long.toHexString(i2 - last));  
	                    else  
	                        sb.append(", -" + Long.toHexString(last - i2));  
	                    last = i2;  
	                }  
	                break;  
	            case 8:  
	                throw new AssertionError("Not supported");  
	        }  
	        return sb.toString();  
	    }  
	  
	    private static Unsafe getUnsafe()  
	    {  
	        try  
	        {  
	            Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");  
	            theUnsafe.setAccessible(true);  
	            return (Unsafe) theUnsafe.get(null);  
	        }  
	        catch (Exception e)  
	        {  
	            throw new AssertionError(e);  
	        }  
	    }