我試圖將長整型轉換爲整型,但失敗。如果有問題,我在Google App Engine的Servlet中使用。我已經搜索到post1,post2docs但沒有結果 從我的日誌。指向此行:長整型拋出拋出ClassCastException
//fields
private int multiplyer;
private Map<String, Object> mappings;
//the method
Echo.log.info("key: "+WinningSetMappingEnum.multiplyer.toString()
+" value: "
+mappings.get(WinningSetMappingEnum.multiplyer.toString())
+" "
+mappings.get(WinningSetMappingEnum.multiplyer.toString()).getClass().getName()
);//For logging
multiplyer=(Integer)mappings.get(MappingEnum.multiplyer.toString());//PROBLEM
LOG:
com.wtsang02.deserlizeMapping: key: multiplyer value: 0 java.lang.Long
java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer
鏈接的帖子怎麼沒有幫助你? –
問題是map返回的Object,在原始問題中聲明,但代碼標記沒有顯示。解決方案是Object-> Long-> long-> int – wtsang02
@PaulBellora它不是dup,即Long-> Integer。看到我以前的評論。 – wtsang02