Kotlin中使用Static

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静态常量 

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

静态方法 

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

然后在java类中调用

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

kotlin中调用

Fragment.LIST.BILL_CODE
Fragment.getInstance()