List<T> 里面嵌套List<T>

String str = "[{"analysis":""," +
""answer":" A"," +
""choices":"[{"content":"at", "title":" A", "type":"text"}," +
"{"content":"on","title":"B", "type":"text"}," +
"{"content":"in","title":" C","type":"text"}," +
"{"content":"for","title":"D","type":"text"}]"," +
""code":"choice","doneCount":1,"errorRate":"55","level":0," +
""questionId":"1","score":0," +
""sectionId":"2"," +
""sectionName":"3|单选题","sort":1," +
""subjectName":"

We request you to settle the claim＿an early date.

"}]";

List tlist = JSONArray.parseArray(str,T.class);
List tlist = JSON.parseArray(str,T.class);

转回json

你是如何转换成string的？