幕布斯7119047
//创建追加可变字符串StringBuffer appendSB = new StringBuffer("abc");appendSB.append("123");appendSB.append('2');appendSB.append(true);appendSB.append(" abc").append("def").append("****").append(1221);System.out.println("appendSB:" + appendSB);//使用StringBuffer创建完全可视化的SQL语句StringBuffer querySB = new StringBuffer();querySB.append("SELECT studentid, NAME, gender, age, telephone, address, addedtime ").append(" FROM student_info ").append(" WHERE studentid=1 AND gender=1 ")