利用Java写一个学生管理系统

package bean;

public class Student {

String name;

String studentId;

String sex;

int grade;

public Student(String name，String studentId，String sex， int grade){

this .name= name;

this .studentId= studentId;

this .sex = sex;

this .grade = grade;

}

public int getGrade(){

return grade;

}

public String getName(){

return name;

}

public String getSex(){

return sex;

}

public void setGrade( int g){

this .grade = g;

}

public String getStudentId(){

return studentId;

}

}

System.out.println( "***************" );

  System.out.println( "*欢迎来到学生管理系统 *" );

  System.out.println( "*1：增加学生                    *" );

  System.out.println( "*2：删除学生                    *" );

  System.out.println( "*3：修改成绩                    *" );

  System.out.println( "*4：查询成绩                    *" );

  System.out.println( "***************" );

  System.out.println( "您想选择的操作是：" );

package test;

import java.util.*;

import bean.Student;

public class Manager {

static List<Student> StudentList = new LinkedList<Student>();

public static void main(String[] agrs){

select(StudentList);

}

private static void select(List<Student> StudentList ){

System.out.println( "***************" );

System.out.println( "*欢迎来到学生管理系统 *" );

System.out.println( "*1：增加学生                    *" );

System.out.println( "*2：删除学生                    *" );

System.out.println( "*3：修改成绩                    *" );

System.out.println( "*4：查询成绩                    *" );

System.out.println( "***************" );

System.out.println( "您想选择的操作是：" );

Scanner sc = new Scanner(System.in);

int choice = sc.nextInt();

switch (choice){

//增加学生

case 1 :

System.out.print( "请输入学生的姓名：" );

Scanner Sname = new Scanner(System.in);

String name = Sname.nextLine();

System.out.print( "请输入学生的性别：" );

Scanner Ssex = new Scanner(System.in);

String sex = Ssex.nextLine();

System.out.print( "请输入学生的学号：" );

Scanner SId = new Scanner(System.in);

String studentId = SId.nextLine();

System.out.print( "请输入学生的成绩：" );

Scanner Sgrade = new Scanner(System.in);

int grade = Sgrade.nextInt();

StudentList.add( new Student(name，studentId，sex，grade));

System.out.println( "添加成功！！！！！" );

select(StudentList);

break ;

//删除学生成绩

case 2 :

System.out.print( "请告诉我需要删除学生的学号：" );

Scanner Sid = new Scanner(System.in);

String SstudentId = Sid.nextLine();

boolean isfindDelete = false ;

for ( int i = 0 ; i < StudentList.size(); i++) {

if (SstudentId.equals(StudentList.get(i).getStudentId())){

System.out.println( "发现了该学生，正在删除..." );

StudentList.remove(i);

System.out.println( "删除成功!!!" );

isfindDelete = true ;

}

}

if (!isfindDelete){

System.out.println( "抱歉，没有找到" );

}

select(StudentList);

break ;

//修改学生成绩

case 3 :

System.out.print( "请告诉我需要修改成绩学生的学号：" );

Scanner GId = new Scanner(System.in);

String GstudentId = GId.nextLine();

boolean isfindChange = false ;

for ( int j = 0 ; j < StudentList.size(); j++) {

if (GstudentId.equals(StudentList.get(j).getStudentId())){

System.out.println( "发现了该学生，正在修改..." );

System.out.println( "学生原成绩为" +StudentList.get(j).getGrade());

System.out.print( "请输入修改后学生的成绩：" );

Scanner Ggrade = new Scanner(System.in);

int grade2 = Ggrade.nextInt();

StudentList.get(j).setGrade(grade2);

System.out.println( "修改成功!!!" );

isfindChange = true ;

} else {

}

}

if (!isfindChange){

System.out.println( "抱歉，没有找到" );

}

select(StudentList);

break ;

//查看学生成绩

case 4 :

System.out.print( "请告诉我需要查询学生的学号：" );

Scanner CId = new Scanner(System.in);

String CstudentId = CId.nextLine();

boolean isfindData = false ;

for ( int i = 0 ; i < StudentList.size(); i++) {

if (CstudentId.equals(StudentList.get(i).getStudentId())){

System.out.println( "名字:" +StudentList.get(i).getName());

System.out.println( "性别:" +StudentList.get(i).getSex());

System.out.println( "学号:" +StudentList.get(i).getStudentId());

System.out.println( "成绩:" +StudentList.get(i).getGrade());

isfindData = true ;

}

}

if (!isfindData){

System.out.println( "抱歉，没有找到" );

}

select(StudentList);

break ;

default :

System.out.println( "您输入的数字有误，请重新输入：" );

break ;

}

}

}