Kotlin中使用Static

靜态常量 

object LIST{
        var BILL_CODE:String = "bill_code"
    }
           

靜态方法 

companion object{
        fun getInstance():Fragment{
            return Fragment()
        }
    }
           

然後在java類中調用

Fragment.LIST.INSTANCE.getBILL_CODE()
Fragment.Companion.getInstance()
           

kotlin中調用

Fragment.LIST.BILL_CODE
Fragment.getInstance()