import com.google.gwt.core.client.impl.Impl; //导入依赖的package包/类
private static void hookWindowClosing() {
	Impl.scheduleDispose(new Disposable() {
		@Override
		public void dispose() {
			detachWidgets();
		}
	});
	// Catch the window closing event.
	Window.addCloseHandler(new CloseHandler<Window>() {
		@Override
		public void onClose(CloseEvent<Window> closeEvent) {
			detachWidgets();
		}
	});
}
 

import com.google.gwt.core.client.impl.Impl; //导入依赖的package包/类
public static int identityHashCode(Object o) {
  return (o == null) ? 0 : (!(o instanceof String)) ? Impl.getHashCode(o)
      : String.HashCache.getHashCode((String) o);
}
 

import com.google.gwt.core.client.impl.Impl; //导入依赖的package包/类
private void cancelTimer() {
    if (timeoutMillis > 0) {
        Impl.clearTimeout(timerId);
    }
}
 

import com.google.gwt.core.client.impl.Impl; //导入依赖的package包/类
public int hashCode() {
  return Impl.getHashCode(this);
}
 

import com.google.gwt.core.client.impl.Impl; //导入依赖的package包/类
public static int identityHashCode(Object o) {
    return (o == null) ? 0 : (!(o instanceof String)) ? Impl.getHashCode(o)
            : String.HashCache.getHashCode((String) o);
}
 

import com.google.gwt.core.client.impl.Impl; //导入依赖的package包/类
@Override
public boolean isInProcess() {
  return Impl.isEntryOnStack();
}