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Student.java
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Student.java
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package finallTest;
import java.io.*;
import java.util.ArrayList;
import java.util.List;
public class Student {
public String studentnumber;//学生学号
public String studentname;//学生姓名
public String IDnumber;//学生身份证号
public String study;//学生选修的专业
public String classname;//学生所在的班级
public String nativeplace;//学生的籍贯
public String adress;//学生的家庭地址
public String grade;//学生的成绩
static int count = 0;
static List<Student> user = new ArrayList<Student>();//学生集合
public void add(String studentnumber, String studentname, String IDnumber, String study, String classname,
String nativeplace, String adress, String grade) {
this.studentnumber = studentnumber;
this.studentname = studentname;
this.IDnumber = IDnumber;
this.study = study;
this.classname = classname;
this.nativeplace = nativeplace;
this.adress = adress;
this.grade = grade;
}
//从文件中收集学生信息
public void collection() {
count =0;
try {
File file = new File("D:\\student1.txt");
FileReader reader = new FileReader(file);
BufferedReader bre = new BufferedReader(new InputStreamReader(new FileInputStream(file), "gbk"));
String gg = null;
String str = "";
while ((gg = bre.readLine()) != null) {
str = gg;
//System.out.println(str);
count++;
String[] k = str.split(" ");
Student t = new Student();
t.add(k[0], k[1], k[2], k[3], k[4], k[5], k[6], k[7]);
//System.out.println(t.adress);
user.add(t);
}
bre.close();
reader.close();
} catch (Exception e) {
e.printStackTrace();
}
}
//增加学生信息
public void addstudent(Student fg) {
user.add(fg);
count++;
try {
//File file = new File("D:\\student.txt");
OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(new File("D:\\student1.txt")), "GBK");
BufferedWriter bw = new BufferedWriter(writer);
for (int i = 0; i < count; i++) {
String ww = "";
ww = user.get(i).studentnumber + " " + user.get(i).studentname + " " + user.get(i).IDnumber + " " + user.get(i).study + " " +
user.get(i).classname + " " + user.get(i).nativeplace + " " + user.get(i).adress + " " + user.get(i).grade + "\r\n";
bw.write(ww);
}
bw.close();
} catch (Exception e) {
e.printStackTrace();
}
}
//删除某一学生所有信息
public void deletestudent(String number){
int hao=0;
for(int i=0;i<count;i++){
if(user.get(i).studentnumber.equals(number)){
hao=i;
}
}
user.remove(hao);
count--;
try {
//File file = new File("D:\\student.txt");
OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(new File("D:\\student1.txt")), "GBK");
BufferedWriter bw = new BufferedWriter(writer);
for (int i = 0; i < count; i++) {
String ww = "";
ww = user.get(i).studentnumber + " " + user.get(i).studentname + " " + user.get(i).IDnumber + " " + user.get(i).study + " " +
user.get(i).classname + " " + user.get(i).nativeplace + " " + user.get(i).adress + " " + user.get(i).grade + "\r\n";
// System.out.println(ww);
bw.write(ww);
}
bw.close();
} catch (Exception e) {
e.printStackTrace();
}
}
//修改某学生的任意信息
public void change(String number,String gai,String nei) {
int hhh = 0;
for (int i = 0; i < count; i++) {
if (number.equals(user.get(i).studentnumber)) {
hhh = i;
//System.out.println(hhh);
}
}
String ww = "";
if (gai.equals("studentnumber")) {
ww = nei + " " + user.get(hhh).studentname + " " + user.get(hhh).IDnumber + " " + user.get(hhh).study + " " +
user.get(hhh).classname + " " + user.get(hhh).nativeplace + " " + user.get(hhh).adress + " " + user.get(hhh).grade + "\r\n";
}
if (gai.equals("studentname")) {
ww = user.get(hhh).studentnumber + " " +nei + " " + user.get(hhh).IDnumber + " " + user.get(hhh).study + " " +
user.get(hhh).classname + " " + user.get(hhh).nativeplace + " " + user.get(hhh).adress + " " + user.get(hhh).grade + "\r\n";
}
if (gai.equals("IDnumber")) {
ww = user.get(hhh).studentnumber + " " + user.get(hhh).studentname + " " + nei+ " " + user.get(hhh).study + " " +
user.get(hhh).classname + " " + user.get(hhh).nativeplace + " " + user.get(hhh).adress + " " + user.get(hhh).grade + "\r\n";
}
if (gai.equals("study")) {
ww = user.get(hhh).studentnumber + " " + user.get(hhh).studentname + " " + user.get(hhh).IDnumber + " " + nei + " " +
user.get(hhh).classname + " " + user.get(hhh).nativeplace + " " + user.get(hhh).adress + " " + user.get(hhh).grade + "\r\n";
}
if(gai.equals("classname")){
ww = user.get(hhh).studentnumber + " " + user.get(hhh).studentname + " " + user.get(hhh).IDnumber + " " + user.get(hhh).study + " " +
nei + " " + user.get(hhh).nativeplace + " " + user.get(hhh).adress + " " + user.get(hhh).grade + "\r\n";
}
if(gai.equals("nativeplace")){
ww = user.get(hhh).studentnumber + " " + user.get(hhh).studentname + " " + user.get(hhh).IDnumber + " " + user.get(hhh).study + " " +
user.get(hhh).classname + " " + nei + " " + user.get(hhh).adress + " " + user.get(hhh).grade + "\r\n";
}
if(gai.equals("adress")){
ww = user.get(hhh).studentnumber + " " + user.get(hhh).studentname + " " + user.get(hhh).IDnumber + " " + user.get(hhh).study + " " +
user.get(hhh).classname + " " + user.get(hhh).nativeplace + " " + nei + " " + user.get(hhh).grade + "\r\n";
}
if(gai.equals("grade")){
ww =user.get(hhh).studentnumber + " " + user.get(hhh).studentname + " " + user.get(hhh).IDnumber + " " + user.get(hhh).study + " " +
user.get(hhh).classname + " " + user.get(hhh).nativeplace + " " + user.get(hhh).adress + " " + nei + "\r\n";
System.out.println(ww);
}
user.remove(hhh);
try {
//File file = new File("D:\\student.txt");
OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(new File("D:\\student1.txt")), "GBK");
BufferedWriter bw = new BufferedWriter(writer);
for (int i = 0; i < count; i++) {
if(i!=hhh){
String kk="";
kk = user.get(i).studentnumber + " " + user.get(i).studentname + " " + user.get(i).IDnumber + " " + user.get(i).study + " " +
user.get(i).classname + " " + user.get(i).nativeplace + " " + user.get(i).adress + " " + user.get(i).grade + "\r\n";
//System.out.println(kk);
bw.write(kk);
}else{
//System.out.println(ww);
bw.write(ww);
}
}
bw.close();
} catch (Exception e) {
e.printStackTrace();
}
}
//按学号查找某一学生的全部信息
public Student select(String number){
int oo =0;
for(int i=0;i<count;i++){
if(user.get(i).studentnumber.equals(number)){
oo=i;
}
}
return user.get(oo);
}
public void showgrade(){
String[] name = new String[user.size()];
int[] gd = new int[user.size()];
for(int i=0;i<count;i++){
name[i]=user.get(i).studentname;
gd[i]=Integer.parseInt(user.get(i).grade);
}
for(int i=0;i<name.length-1;i++){
int max=i;
for(int j=i+1;j<name.length;j++){
if(gd[max]<gd[j]){
max=j;
}
}
if(max!=i){
int temp=gd[i];
gd[i]=gd[max];
gd[max]=temp;
String ch=name[i];
name[i]=name[max];
name[max]=ch;
}
}
System.out.println("姓名 成绩");
for(int q=0;q<count;q++){
System.out.println(name[q]+" "+gd[q]);
}
}
//查看文件里所有学生的学习成绩由高到低
public void showstudy(){
int bujige=0;
int jige=0;
int zhongdeng=0;
int lianghao=0;
int youxiu=0;
for(int i=0;i<count;i++)
{
if((Integer.parseInt(user.get(i).grade))>=0&&(Integer.parseInt(user.get(i).grade))<=59){
bujige++;
}
if((Integer.parseInt(user.get(i).grade))>=60&&(Integer.parseInt(user.get(i).grade))<=69){
jige++;
}
if((Integer.parseInt(user.get(i).grade))>=70&&(Integer.parseInt(user.get(i).grade))<=79){
zhongdeng++;
}
if((Integer.parseInt(user.get(i).grade))>=80&&(Integer.parseInt(user.get(i).grade))<=89){
lianghao++;
}
if((Integer.parseInt(user.get(i).grade))>=90&&(Integer.parseInt(user.get(i).grade))<=100){
youxiu++;
}
}
System.out.println("0-59:"+bujige);
System.out.println("60-69:"+jige);
System.out.println("70-79:"+zhongdeng);
System.out.println("80-89:"+lianghao);
System.out.println("90-100:"+youxiu);
}
}