当我使用对该对象的java.lang.reflect.Proxy.newInstance(...)调用创建接口实例时，不会将其传递给 invocationHandler。finalize谁能指出我在哪里记录了这种行为？
private Method lastInvokedMethod = null;
@Test
public void finalize_methods_seem_to_disappear_on_proxies() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
final Method lengthMethod = CharSequence.class.getDeclaredMethod("length");
final Method finalizeMethod = Object.class.getDeclaredMethod("finalize");
final Method equalsMethod = Object.class.getDeclaredMethod("equals", new Class[] {Object.class});
InvocationHandler handler = new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
lastInvokedMethod = method;
if (method.equals(lengthMethod))
return 42;
else if (method.equals(equalsMethod))
return true;
else
return null;
}
};
CharSequence proxy = (CharSequence) Proxy.newProxyInstance(this.getClass().getClassLoader(), new Class<?>[]{CharSequence.class}, handler);
// check that invocationHandler is working via reflection
lastInvokedMethod = null;
assertEquals(42, invokeMethod(proxy, lengthMethod));
assertEquals(lengthMethod, lastInvokedMethod);
// check that other methods defined on Object are delegated
lastInvokedMethod = null;
assertEquals(true, invokeMethod(proxy, equalsMethod, "banana"));
assertEquals(equalsMethod, lastInvokedMethod);
// check that we can invoke finalize through reflection
Object finalizableObject = new Object() {
protected void finalize() throws Throwable {
lastInvokedMethod = finalizeMethod;
super.finalize();
}
};
lastInvokedMethod = null;
invokeMethod(finalizableObject, finalizeMethod);
assertEquals(finalizeMethod, lastInvokedMethod);
// Finally - a call to finalize is not delegated
lastInvokedMethod = null;
invokeMethod(proxy, finalizeMethod);
assertNull(lastInvokedMethod);
}
private Object invokeMethod(Object object, Method method, Object... args) throws IllegalAccessException, InvocationTargetException {
method.setAccessible(true);
return method.invoke(object, args);
}