??????????????????????????????????????Java String?????????????й??????????????С??????????????????????????????????????????????????????????????JDK??????StringBuffer??????????????????????Ч·??????????????????????????????????????

???????????????String??

????Java String????????????????????????????????????????????????汻??????????????????????????????????????????String????????String???????????????????????????????????String????????????+??????????????????????

????String sample1=new String(“Builder.com”);
????
????sample1+=”is”;
????
????sample1+=”the place”;
????
????sample1+=”to be.”;

??????????????String???????????????滻?????е???????????Builder.com?????????????????????????μ????

?????????????????????????????????????????????????????????????????????????С?????????????????????????????ж?????????????ó???????????????????????StringBuffer?????????????????????

??????StringBuffer?????????

????StringBuffer?????????????????????????????????????????????????????????????????????????????????????μ?StringBuffer??????ó????????????趨??С????????????????

????StringBuffer sb=new StringBuffer();
????
????StringBuffer sb=new StringBuffer(30);
????
????StringBuffer sb=new StringBuffer(“Builder.com”);