编写一个查询类,输入学生学号,若该生在数据文件(test.txt)中存在,在JTextArea中显示该生信息 若该生在数据文件(test.txt)中不存在,显示”查无此人”,可反复查找.在输出中,能显示该生的总成绩和平均成绩,将显示结果存盘(例如存入“abc.txt”)-Write a query class Students enter, if the student in the data file (test.txt) exists in the JTextArea to display the student information　if the student in the data file (test.txt) does not exist, show " Charles no such person " can be repeated look at the output, can show the student' s total score and grade point average, save the results will be displayed (for example, into"　abc.txt " )