一段代码不懂 求解释····

Question

String qq="";
if(rs!=null && rs.next())
{
rs.beforeFirst();
while(rs.next()){
    qq+=qq.equalsIgnoreCase("")?"":",";
    qq+="{name:\""+rs.getString("userName")+"\",id:\""+rs.getInt("userId")+"\"}";
    
    } 
out.print("["+qq+"]");}   
这段代码中的qq+后面的是什么意思？求详细解释

Answer 1

qq+= 意思是 
qq = qq + "xxxxx"

Answer 2

qq+=qq.equalsIgnoreCase("")?"":",";-----》如果qq是空串，就还是空串；如果不是空串，后面加豆号
qq+="{name:\""+rs.getString("userName")+"\",id:\""+rs.getInt("userId")+"\"}";----》写成类似：
name:xiaolu0917,id:123456

Answer 3

写错了，应是：
name:"xiaolu0917",id:"123456"

Answer 4

说白了就是想得到类似下面这样的串{name:"name1",id:"id1"},{name:"name2",id:"id2"},{name:"name3",id:"id3"}