要求：
1） 该系统主要处理教师评学信息。
2） 班级信息主要包括：班级编号、班级名称、所在院系、评学成绩等内容。
3） 教师信息主要包括：编号、姓名、电话等内容。
4） 完成以下的操作：班级信息、教师信息、评学信息的录入、修改、删除和查询。
提示：
1）建立学校类、教师类、班级类、评学类
2）学校、教师、班级、评学信息的初始化
3）学校、教师、班级、评学信息的添加、修改、删除、查找
4）学校、教师、班级、评学信息的输出
5）对评学信息按评学成绩排序

package qfy;
class myclass implements Comparable<myclass>{String classnum;String classname;String classyuan;String classtest;String classtype;String type;public myclass(String num,String name,String yuan,String test){classnum=num;classname=name;classtest=test;classyuan=yuan;}
//获得到所有的属性public String getMyclass(){return classnum+" "+classname+" "+classyuan+" "+classtest;}
//通过判断传来的字符串，来选择性修改某个属性,老方法public String changeMyclass(String classtype,String now){if(classtype=="classtest"){return this.classtest=now;}if(classtype=="classnum"){return this.classnum=now;}if(classtype=="classname"){return this.classname=now;}if(classtype=="classyuan"){return this.classyuan=now;}return "ok";}public String getClassname(){return classname;}public int compareTo(myclass o) {// TODO Auto-generated method stubreturn this.classtest.compareTo(o.classtest);}}

package qfy;class teacher implements Comparable<teacher> {String teachernum;String teachername;String teachertel;public teacher(String num,String name,String tel){teachertel=tel;teachername=name;teachernum=num;}//获得到所有的属性public String getTeacher(){return teachernum+" "+teachername+" "+teachertel;}//通过判断传来的字符串，来选择性修改某个属性public String changeTeacher(String classtype,String now){if(classtype=="teachernum"){return this.teachernum=now;}if(classtype=="teachername"){return this.teachername=now;}if(classtype=="teachertel"){return this.teachertel=now;}return "ok";}public String getTeachername(){return teachername;}public int compareTo(teacher o) {// TODO Auto-generated method stubreturn this.teachernum.compareTo(o.teachernum);}}

package qfy;import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;public class test {public static void main(String[] args) throws IOException {List<myclass> list = new ArrayList<myclass>();//添加addclass(list,"1", "ly", "jisuanji", "99");addclass(list,"1", "wy", "1", "86");addclass(list,"1", "wy", "1", "86");addclass(list,"1", "wy", "1", "86");addclass(list,"1", "wy", "1", "86");//查找//getMyClass("qfy2",list);//改变changetype(list,"classname","ly", "qqq");// 删除调用//remove("1", list);//System.out.println(list.size());// 排序调用// sort(list);File file = new File("myclass.db");if (!file.exists()) {file.createNewFile();}//写FileWriter fw = new FileWriter(file);for (int i = 0; i < list.size(); i++) {String result = myclassToString(list.get(i));fw.write(result + "\n");}fw.close();System.out.println("========================================");//读BufferedReader br = new BufferedReader(new FileReader(file));String temp;while ((temp = br.readLine()) != null) {System.out.println(temp);}br.close();}// 删除的方法public static void remove(String name, List<myclass> list) {for (int i = 0; i < list.size(); i++) {if ((list.get(i)).getClassname() == name) {list.remove(i);}}}// 排序方法public static void sort(List<myclass> list) {Collections.sort(list);for (int i = 0; i < list.size(); i++) {System.out.println(list.get(i).getMyclass());}}// 变成字符串public static String myclassToString(myclass my) {String result = null;StringBuffer mystr = new StringBuffer();mystr.append(my.classnum + " ");mystr.append(my.classname + " ");mystr.append(my.classyuan+" ");mystr.append(my.classtest+" ");result = mystr.toString();return result;}// 查找public static void getMyClass(String string,List<myclass> list) {for (int i = 0; i < list.size(); i++) {if((list.get(i).getMyclass()).indexOf(string)!=-1){System.out.println("资料如下");System.out.println(list.get(i).getMyclass());break;}else{System.out.println("查无此人");break;}}}//添加方法public static void addclass(List<myclass> list,String num,String name,String yuan,String test){list.add(new myclass(num, name, yuan, test));}//改变方法  changetype(list,"classname","ly", "qqq");public static void changetype(List<myclass> list,String classtype,String oldtype, String now){//char saveoldtype=oldtype;for (int i = 0; i < list.size(); i++) {if((list.get(i).getMyclass()).indexOf(oldtype)!=-1){System.out.println("修改完成,结果如下");list.get(i).changeMyclass(classtype,now);System.out.println(list.get(0).getMyclass());break;}else{System.out.println("没有资料，无法修改");break;}}}
}

package qfy;import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;public class test_teacher {public static void main(String[] args) throws IOException {List<teacher> list = new ArrayList<teacher>();//添加addclass(list,"4024", "qfy", "137");addclass(list,"4023", "xsh", "6902");addclass(list,"4025", "spz", "2755");//查找//getTeaCher("qfy2",list);//改变//changetype(list,"teachername","qfy", "qqq");// 删除调用//remove("qfy", list);System.out.println(list.size());// 排序调用//sort(list);File file = new File("teacher.db");if (!file.exists()) {file.createNewFile();}FileWriter fw = new FileWriter(file);for (int i = 0; i < list.size(); i++) {String result = teacherToString(list.get(i));fw.write(result + "\n");}fw.close();System.out.println("========================================");BufferedReader br = new BufferedReader(new FileReader(file));String temp;while ((temp = br.readLine()) != null) {System.out.println(temp);}br.close();}// 删除的方法public static void remove(String name, List<teacher> list) {for (int i = 0; i < list.size(); i++) {if ((list.get(i)).getTeachername() == name) {list.remove(i);}}}// 排序方法public static void sort(List<teacher> list) {Collections.sort(list);for (int i = 0; i < list.size(); i++) {System.out.println(list.get(i).getTeacher());}}// 变成字符串public static String teacherToString( teacher teacher) {String result = null;StringBuffer mystr = new StringBuffer();mystr.append(teacher.teachernum + " ");mystr.append(teacher.teachername + " ");mystr.append(teacher.teachertel+" ");result = mystr.toString();return result;}// 查找public static void getTeaCher(String string,List<teacher> list) {for (int i = 0; i < list.size(); i++) {if((list.get(i).getTeacher()).indexOf(string)!=-1){System.out.println("资料如下");System.out.println(list.get(i).getTeacher());break;}else{System.out.println("查无此人");break;}}}//添加public static void addclass(List<teacher> list,String num,String name,String tel){list.add(new teacher(num, name, tel));}//改变方法  changetype(list,"teachername","qfy", "qqq");public static void changetype(List<teacher> list,String classtype,String oldtype, String now){//char saveoldtype=oldtype;for (int i = 0; i < list.size(); i++) {if((list.get(i).getTeacher()).indexOf(oldtype)!=-1){System.out.println("修改完成,结果如下");list.get(i).changeTeacher(classtype,now);System.out.println(list.get(0).getTeacher());break;}else{System.out.println("没有资料，无法修改");break;}}}}