Examples of sun.misc.Unsafe.objectFieldOffset()

sun.misc.Unsafe.objectFieldOffset()

Retrieves the offset value of the {@link Field} for use by other methodsin this class.
@param field The {@link Field} to retrieve the offset for. @return The offset value.

      fc = Foo.class.getDeclaredField("c");
    } catch (NoSuchFieldException e) {
      System.out.println(e);
      return;
    }
    long offset = unsafe.objectFieldOffset(fc);
    System.out.println(unsafe.getObject(f,offset));
    unsafe.putObject(f,offset, "hello Unsafe");
    System.out.println(unsafe.getObject(f,offset));
    System.out.println(((Foo)f).c);
    String newC = "hello again Unsafe";

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    f.setAccessible(true);
    Unsafe unsafe = (Unsafe)f.get(c);


    f = Reference.class.getDeclaredField("referent");
    f.setAccessible(true);
    long referent_offset = unsafe.objectFieldOffset(f);


    Test7190310_unsafe t = new Test7190310_unsafe();
    TestObject o = new TestObject();
    t.obj = o;

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    Unsafe unsafe = getUnsafe();
    TreeMap<Long, String> fields = new TreeMap<Long, String>(); 
    for (Class<?> c = clazz; c != null; c = c.getSuperclass()) {
      for (Field f : c.getDeclaredFields()) {
        fields.put(
            unsafe.objectFieldOffset(f),
            f.getDeclaringClass().getSimpleName() + "." + f.getName());
      }
    }
    fields.put(
        RamUsageEstimator.shallowSizeOfInstance(clazz), "#shallowSizeOfInstance(" + clazz.getName() + ")");

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