//append第一种用法 StringBuilder builder = new StringBuilder(""); builder.append("Hello"); builder.append(" World"); //append第二种用法 StringBuffer buffer1=new StringBuffer("seed"); StringBuffer buffer2=new StringBuffer(" destiny"); StringBuilder builder = new StringBuilder(); builder.append(buffer1); builder.append(buffer2);
//builder.insert(int offset, String str1)指定位置插入字符串 //builder.delete(int strat,int end)删除指定索引之间的字符,若start==end,结果不变 //builder.toString()将生成器转换成字符串 //builder.deleteCharAt(index) //builder.reverse()反序