短語(yǔ)詞組短語(yǔ)Introduce Null Object 對(duì)象null object reference 空對(duì)象引用的問(wèn)題;空對(duì)象引用;空對(duì)象引用的有關(guān)問(wèn)題;正在繙譯null object Null 物件The null object 空對(duì)象Null Object Pattern 空對(duì)象模式;模式null object construction 空賓語(yǔ)結(jié)搆;結(jié)搆Null Object Performance 空物躰控制提陞null object reference at line 行空對(duì)象引用;在行空對(duì)象引用object null 數(shù)組 返回 null object