json{"au":"1","diary":[{"t":"1","r":"1"},{"t":"2","r":"2"}]}這是mongodb中自己設(shè)計(jì)的一個(gè)格式，現(xiàn)在的問(wèn)題是我想對(duì)diary這個(gè)集合再添加新的值，就像這樣json{"au":"1","diary":[{"t":"1","r":"1"},{"t":"2","r":"2"},{"t":"3","r":"3"}]}這樣的操作在JAVA中可以實(shí)現(xiàn)嗎？可以的話應(yīng)該怎么寫(xiě)？