替换所有出现但最后出现的字符

您可以从0到提取子字符串形式

lastIndexOf('.')

.

lastIndexOf.

就像是：

String theString = "a.b.c.d";String separator = ".";String replacement = "";String newString = theString.substring(0, theString.lastIndexOf(separator)).replaceAll(separator , replacement).concat(theString.substring(theString.lastIndexOf(separator)));Assert.assertEquals("abc.d", newString);