代碼如下：public?class?mainTest?{ ????public?static?void?main(String[]?args)?{ ????????????System.out.println(testDouble("10.8")); ????????????System.out.println(testFloat("10.8")); ????????????System.out.println("----------------------"); ????????????System.out.println(testDouble("38.8")); ????????????System.out.println(testFloat("38.8")); ????} ????public?static?int?testDouble(String?str){ ????????Double?d?=?Double.valueOf(str); ????????return?(int)(d*100); ????} ????public?static?int?testFloat(String?str){ ????????Float?f?=?Float.valueOf(str); ????????return?(int)(f*100); ????} }輸出結果為:1080 1080 ---------------------- 3879 38803879和3880，之間差了一。我知道是因為精度轉化導致的。但是我想知道具體是為什么。謝謝。