java中StringBuilder的使用

append的使用

// 构建SQLStringBuilder sql = new StringBuilder();sql.append("insert into doublecolorballs(redBall,blueBall,addTime) values(");sql.append("'"+lottery.getRedBall()+"'");sql.append(",'"+lottery.getBlueBall()+"'");sql.append(","+lottery.getAddTime()+")");

?insert的使用

PropertiesUtil pu=new PropertiesUtil();pu.loadProperties("/Menu.properties");StringBuilder sb=new StringBuilder();Enumeration<?> enums=pu.getKey();while(enums.hasMoreElements()){Object key=enums.nextElement();String value=pu.getValue(key.toString());sb.insert(0, key+"."+value+"");//在下标为0的位置的前面插入值}System.out.print(sb.toString());

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