BlockExpEvent

An event that's called when a block yields experience.

当方块产出经验时触发。

Get the experience dropped by the block after the event has processed

@return The experience to drop

该方法用于获取涉事方块将会掉落的经验数量。

@return 涉事方块将会掉落的经验数量。

Set the amount of experience dropped by the block after the event has

processed

@param exp 1 or higher to drop experience, else nothing will drop

该方法用于设置涉事方块将会掉落的经验数量。

@param exp 如传入大于等于一的值则会掉落相应数量的经验，否则不会掉落任何经验。