下面是一個存儲班級三十名學生基本信息的 Java 代碼示例:

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import java.util.ArrayList;
public class Student {
private String name;
private int age;
private String gender;
public Student(String name, int age, String gender) {
this.name = name;
this.age = age;
this.gender = gender;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
public String getGender() {
return gender;
}
}
public class Classroom {
private ArrayListStudent students;
public Classroom() {
this.students = new ArrayListStudent();
}
public void addStudent(Student student) {
students.add(student);
}
public ArrayListStudent getStudents() {
return students;
}
}
public class Main {
public static void main(String[] args) {
Classroom classroom = new Classroom();
// 添加 30 名學生的基本信息
classroom.addStudent(new Student("Tom", 18, "Male"));
classroom.addStudent(new Student("Alice", 19, "Female"));
// ...
// 此處省略 28 名學生的信息
// 獲取所有學生的信息
ArrayListStudent students = classroom.getStudents();
for (Student student : students) {
System.out.println("Name: " + student.getName());
System.out.println("Age: " + student.getAge());
System.out.println("Gender: " + student.getGender());
}
}
}
該代碼定義了兩個類:Student 類表示一個學生,包含了學生的姓名、年齡和性別等信息;Classroom 類表示一個班級,包含了一個學生的列表,并提供了添加學生和獲取學生列表的方法。
在 Main 類的 main 方法中,我們首先實例化一個 Classroom 對象,然后依次添加 30 名學生的信息。最后,我們調用 getStudents 方法獲取所
學生類:
public class Student{
private String name;
private int age;
private double score;
public dd(String name, int age, double score) {
super();
this.name = name;
this.age = age;
this.score = score;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public double getScore() {
return score;
}
public void setScore(double score) {
this.score = score;
}
public void printInfo()
{
System.out.println("name:"+name);
System.out.println("age:"+age);
System.out.println("score:"+score);
}
} main() 方法:public class TestStudent{
public static void main(String[] args) {
Student stu=new Student("李四",20,89);
stu.printInfo();
}} 友情提示:考試的題目還是應該自己做,盡管就是做錯了,那對自己還是很有幫助的
如果不多的話就直接修改 要更新就 update table set id='19'+substring(id,1,4)+'00'+substring(id,5,3)
import java.util.ArrayList;
import java.util.Scanner;import com.sun.org.apache.xpath.internal.Arg;
public class Student {
//兩個私有屬性
private int no ;
private String name ;
//默認構造函數(shù)
public Student(){}
//帶參構造函數(shù)
public Student(int no,String name){
this.no=no;
this.name=name;
}
//添加學生信息
public void addStudentInfo(ArrayList list){
String flag1="yes";
do{
Student student=new Student();
Scanner in =new Scanner(System.in);
System.out.println("請輸入學生學號:");
student.setNo(in.nextInt());
System.out.println("請輸入學生姓名:");
student.setName(in.next());
list.add(student);
System.out.println("是否繼續(xù)添加學生信息(yes/no)?");
flag1=in.next();
} while(flag1.equals("yes"));
}
//讀取學生信息
public void showStudentInfo(ArrayListStudent list){
System.out.println(" 學生no: "+" 學生name: ");
for(Student student:list){
System.out.println(" "+student.getNo()+" "+student.getName());
}
}
public int getNo() {
return no;
}
public void setNo(int no) {
this.no = no;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public static void main(String arg[]) {
ArrayListStudent studentList= new ArrayListStudent();
Student student= new Student();
Scanner inn= new Scanner(System.in);
while(true){
System.out.println("----------------- 歡迎使用學生管理系統(tǒng)------------------");
System.out.println("1.輸入學生信息");
System.out.println("2.顯示學生信息");
System.out.println("0.退出系統(tǒng)");
System.out.println("請選擇....");
int nn= inn.nextInt();
switch (nn) {
case 1:
student.addStudentInfo(studentList);
break;
case 2:
System.out.println("學生信息如下:");
student.showStudentInfo(studentList);
break;
case 0:
System.exit(0);
System.out.println("系統(tǒng)退出!");
break;
default:
break;
}
}
} }
lListStudent students = new ArrayListStudent();
BufferedReader br = new BufferedReader(new FileReader("D:\student.txt"));
String tmpStr = br.readLine();
while(tmpStr != null){
int firstIndex = tmpStr.indexOf(" ");
int secondIndex = tmpStr.indexOf(" ",firstIndex + 1);
int thirdIndex = tmpStr.indexOf(" ", secondIndex + 1);
int forthIndex = tmpStr.indexOf(" ", thirdIndex + 1);
Integer stuId = Integer.parseInt(tmpStr.substring(0,firstIndex));
String stuName = tmpStr.substring(firstIndex + 1,secondIndex);
Integer stuYW = Integer.parseInt(tmpStr.substring(secondIndex + 1,thirdIndex));
Integer stuSX = Integer.parseInt(tmpStr.substring(thirdIndex + 1,forthIndex));
Integer stuYY = Integer.parseInt(tmpStr.substring(forthIndex + 1));
Student student = new Student();
student.setStuId(stuId);
student.setStuName(stuName);
student.setStuYW(stuYW);
student.setStuSX(stuSX);
student.setStuYY(stuYY);
students.add(student);
tmpStr.readLine();
}
//創(chuàng)建一個學生實體類 封裝stuId stuName stuYW stuSx stuYY 這5個屬性。。。
//已經(jīng)幫你把數(shù)據(jù)拆分出來 并以Student 對象的形式放入集合中了 接下來 給分吧 哇咔咔
跑這兒作家庭作業(yè)了? 如果連用哪種頁面技術都不知道提的話,恐怕別人給你源代碼你也看不懂哦,想想別人給你個tapestry、Wicket之類的寫的代碼,拿給老師肯定挨批的喲(一看就露餡了)。
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