Java Unsafe－获取对象内存地址

Java Unsafe获取对象内存地址

 

public class UnsafeTestKlass {       private int value;         public UnsafeTestKlass() {        this(99);     }         public UnsafeTestKlass(int value) {        this.value = value;     }         public int value() {        return value;     } }

获取对象内存地址

public long location(Object object) throws Throwable { Unsafe unsafe = getUnsafe();        Object[] array = new Object[] {object};   long baseOffset = unsafe.arrayBaseOffset(Object[].class); int addressSize = unsafe.addressSize(); long location; switch (addressSize) { case 4: location = unsafe.getInt(array, baseOffset);            break;        case 8:            location = unsafe.getLong(array, baseOffset);            break;        default:            throw new Error("unsupported address size: " + addressSize);     }     return (location); }

 

例子

@Test public void getObjectAddress() throws Throwable {     UnsafeTestKlass klass = new UnsafeTestKlass();     long baseAddress = location(klass);     System.out.println("base address: " + baseAddress); }