学生管理系统1.0版本有5个功能，即添加学生、删除学生、修改学生、查看全部学生、退出系统。

里面对添加重复学号、删除和修改不存在的学号等问题都有相应的解决办法。

代码区：

Student.java

package student;//快捷键Alt+insert
public class Student {private String sid;private String name;private String age;private String address;public Student() {}public Student(String sid, String name, String age, String address) {this.sid = sid;this.name = name;this.age = age;this.address = address;}public String getSid() {return sid;}public void setSid(String sid) {this.sid = sid;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getAge() {return age;}public void setAge(String age) {this.age = age;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}
}

StudentManager.java

package student;import java.util.Scanner;
import java.util.ArrayList;
public class StudentManager {public static void main (String[] args) {ArrayList<Student> array = new ArrayList<Student>();while (true) {System.out.println("--------欢迎来到学生管理系统--------");System.out.println("1 添加学生");System.out.println("2 删除学生");System.out.println("3 修改学生");System.out.println("4 查看全部学生");System.out.println("5 退出系统");System.out.println("请输入你的选择：");Scanner sc = new Scanner(System.in);String line = sc.nextLine();switch (line) {case "1"://System.out.println("添加学生");addStudent(array);break;case "2"://System.out.println("删除学生");deleteStudent(array);break;case "3"://System.out.println("修改学生");updateStudent(array);break;case "4":findAllStudent(array);//System.out.println("查看所有学生");break;case "5":System.out.println("退出系统");System.exit(0); //直接退出java虚拟机default:System.out.println("操作错误，请重新输入：");}}}//添加功能public  static void addStudent(ArrayList<Student> array) {Scanner sc = new Scanner(System.in);//刘正风，嵩山String sid;System.out.println("请输入学生学号：");//风清扬，华山，岳不群，华山while(true) {int index=-1;sid = sc.nextLine();for (int i = 0; i < array.size(); i++) {Student s = array.get(i);if (s.getSid().equals(sid)) {index=i;break;}}if(index==-1)break;elseSystem.out.println("你输入的学号已被使用，请重新输入学号：");}System.out.println("请输入学生姓名：");String name = sc.nextLine();System.out.println("请输入学生年龄：");String age = sc.nextLine();System.out.println("请输入学生地址：");String address = sc.nextLine();//创建学生对象Student s = new Student();s.setSid(sid);s.setName(name);s.setAge(age);s.setAddress(address);//添加学生对象到集合中array.add(s);System.out.println("添加成功！");}//查询功能public static void findAllStudent(ArrayList<Student> array) {if(array.size()==0){System.out.println("无信息！请先添加信息再查询！");return ;}System.out.println("学号\t\t姓名\t\t年龄\t\t地址");for(int i=0;i<array.size();i++) {Student s = array.get(i);System.out.println(s.getSid()+"\t"+s.getName()+"\t"+s.getAge()+"\t\t"+s.getAddress());}}//删除功能public static void deleteStudent(ArrayList<Student> array) {if(array.size()==0){System.out.println("无信息！请先添加信息再删除！");return ;}Scanner sc = new Scanner(System.in);String sid;int index=-1;System.out.println("请输入你要删除的学生的学号：");while(true) {sid = sc.nextLine();for (int i = 0; i < array.size(); i++) {Student s = array.get(i);if (s.getSid().equals(sid)) {index=i;break;}}if(index==-1)System.out.println("该学生不存在！\n请重新输入你要删除的学生的学号:");else {array.remove(index);System.out.println("删除成功！");break;}}}//修改功能public static void updateStudent(ArrayList<Student> array) {if(array.size()==0){System.out.println("无信息！请先添加信息！");return ;}Scanner sc = new Scanner(System.in);String sid;int index=-1;System.out.println("请输入你要修改的学生的学号：");while(true) {sid = sc.nextLine();for (int i = 0; i < array.size(); i++) {Student s1 = array.get(i);if (s1.getSid().equals(sid)) {index = i;break;}}if (index==-1) {System.out.println("该学生不存在！\n请重新输入你要修改的学生的学号:");}elsebreak;}System.out.println("请输入学生新姓名：");String name = sc.nextLine();System.out.println("请输入学生新年龄：");String age = sc.nextLine();System.out.println("请输入学生新地址：");String address = sc.nextLine();Student s = new Student();s.setSid(sid);s.setAge(age);s.setName(name);s.setAddress(address);array.set(index,s);System.out.println("修改成功！");}
}

部分运行结果：