However , because of potential delays in propagating changes in memory writes from one thread to another , there is a possible race condition that would allow a thread to first see one value for an immutable object , and then at some later time see a different value 但是,因為在將內(nèi)存寫方面的更改從一個線程傳播到另一個線程時存在潛在的延遲,所以有可能存在一種競態(tài)條件,即允許一個線程首先看到不可變對象的一個值,一段時間之后看到的是一個不同的值。