第57天 2020/8/31

拓展学生管理系统

1.学生信息保存进文件

按行输出利于读取回来。格式的控制

FileWriter writer=new FileWriter(filename);

        for(i=0;i<k;i++){

        writer.write("stunumber:"+stu[i].get_stunumber()+"\n");

        writer.write("name:"+stu[i].get_name()+"\n");

        writer.write("age:"+stu[i].get_age()+"\n");

        if(stu[i].get_sex()==true){

            writer.write("sex: 女\n");

        }

        else {

            writer.write("sex: 男\n");

        }

        writer.write("score:"+stu[i].get_score()+"\n");

        }

        writer.close();

2.读取文件中学生数据

按行读取回来。格式的控制。

filename=scan.next();

        File file=new File(filename);

        BufferedReader reader=null;

        try

        {

            reader=new BufferedReader(new FileReader(file));

            String tempString=null;

            int i=1;

            int j=0;

            while ((tempString=reader.readLine())!=null){

                 switch(i){

                     case 1:tempString=tempString.substring(10);

                    stu[j].set_stunumber(tempString);

                    break;

                     case 2:tempString=tempString.substring(5);

                    stu[j].set_name(tempString);

                    break;

                    case 3:tempString=tempString.substring(4);

                    stu[j].set_age(Integer.parseInt(tempString));

                    break;

                    case 4:

                tempString=tempString.substring(5);

                    if(tempString.compareTo("男")==0){

                        stu[j].set_sex(false);

                    }

                    if(tempString.compareTo("女")==0){

                        stu[j].set_sex(true);

                    }

                    break;

                    case 5:

                tempString=tempString.substring(6);

                    stu[j].set_scoer(Double.parseDouble(tempString));

                    j++;

                    i=0;

                    break;

                }

                i++;

                k=j;

            }

            reader.close();