String 和 StringBuffer的效率问题
whyy0 2005-06-10 10:15:51 ① String aa = "aa" + "bb" + "cc";
② StringBuffer aa = new StringBuffer("aa" + "bb" + "cc");
③ StringBuffer aa = new StringBuffer();
aa.append("aa");
aa.append("bb");
aa.append("cc");
以上3个方案哪个效率高??为什么??