import net.minecraft.client.gui.GuiSlot; //导入依赖的package包/类
private static void setSelectedID(GuiListExtended list, int id) {
	Field field;
	try{
		if(list instanceof GuiListWorldSelection) {
			field = GuiListWorldSelection.class.getDeclaredField("selectedIdx");
		} else {
			field = GuiSlot.class.getDeclaredField("selectedElement");
		}
		field.setAccessible(true);
		field.set(list, id);
		if(list instanceof GuiListWorldSelection) {
			((GuiListWorldSelection) list).selectWorld(id);
		}
	} catch (Exception e) {
		throw new RuntimeException("Error accessing index field!", e);
	}
}
 

import net.minecraft.client.gui.GuiSlot; //导入依赖的package包/类
private static boolean isSelected(GuiListExtended list, int id) {
	try {
		Method method = GuiSlot.class.getDeclaredMethod("isSelected", int.class);
		method.setAccessible(true);
		return (boolean) method.invoke(list, id);
	} catch (Exception e) {
		throw new RuntimeException("Error accessing getSize()-Method!", e);
	}
}
 

import net.minecraft.client.gui.GuiSlot; //导入依赖的package包/类
private static int getListSize(GuiListExtended list) {
	try {
		Method method = GuiSlot.class.getDeclaredMethod("getSize");
		method.setAccessible(true);
		return (int) method.invoke(list);
	} catch (Exception e) {
		throw new RuntimeException("Error accessing getSize()-Method!", e);
	}
}
 

import net.minecraft.client.gui.GuiSlot; //导入依赖的package包/类
public SlotClicked(List<GuiButton> buttonList, GuiSlot slotClicked)
{
	super(buttonList);
	this.slotClicked = slotClicked;
}