java学生管理系统（增、删、改、查功能）

package mm;

import java.util.Scanner;
import java.util.ArrayList;

class Student1 {
 private String stunumber;
 private String name;
 private int age;
 private boolean sex;
 private double score;

 public Student1() {

 }

 public Student1(String stunumber, String name, int age, boolean sex, double score) {

  this.stunumber = stunumber;
  this.name = name;
  this.age = age;
  this.sex = sex;
  this.score = score;
 }

 public String getStunumber() {
  return stunumber;
 }

 public void setStunumber(String stunumber) {
  this.stunumber = stunumber;
 }

 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 boolean getSex() {
  return sex;
 }

 public void setSex(boolean sex) {
  this.sex = sex;
 }

 public double getScore() {
  return score;
 }

 public void setScore(double score) {
  this.score = score;
 }
}

public class Student {
 static Scanner sc = new Scanner(System.in);

 public static void main(String[] args) {
  ArrayList<Student1> list = new ArrayList<Student1>();
  for (;;) {
   System.out.println("请选择");
   System.out.println("1，遍历");
   System.out.println("2，增加");
   System.out.println("3，删除");
   System.out.println("4，修改");
   System.out.println("5，查询");
   System.out.println("请输入您的选择：");
   int choice = sc.nextInt();
   switch (choice) {
   case 1:
    showstudent(list);
    break;
   case 2:
    addstudent(list);
    break;
   case 3:
    deletestudent(list);
    break;

   case 4:
    updatestudent(list);
    break;
   case 5:
    selectstudent(list);
    break;
   }
  }
 }

 private static void showstudent(ArrayList<Student1> list) {
  if (list.size() == 0) {
   System.out.println("当前没有学生信息");
   return;
  }

  for (Student1 stu : list) {
   System.out.println("学号：" + stu.getStunumber() + " 姓名：" + stu.getName() + " 年龄：" + stu.getAge() + " 性别："
     + stu.getSex() + " 成绩：" + stu.getScore());
  }

 }

 private static void addstudent(ArrayList<Student1> list) {
  System.out.println("请输入学号：");
  String stunumber = sc.next();
  System.out.println("请输入姓名：");
  String name = sc.next();
  System.out.println("请输入年龄：");
  int age = sc.nextInt();
  System.out.println("请输入性别：");
  boolean sex = sc.nextBoolean();
  System.out.println("请输入成绩：");
  double score = sc.nextDouble();
  Student1 stu = new Student1(stunumber, name, age, sex, score);
  list.add(stu);
  System.out.println("添加成功！");

 }

 private static void deletestudent(ArrayList<Student1> list) {
  if (list.size() == 0) {
   System.out.println("当前没有学生信息");
   return;
  }
  System.out.println("请输入您想要删除的学生学号：");
  String id = sc.next();
  for (int i = 0; i < list.size(); i++) {
   if (id.equals(list.get(i).getStunumber())) {

    list.remove(i);
    System.out.println("删除成功！");
   } else {
    System.out.println("未找到您想要删除的学生信息，请重新输入");
   }
  }
 }

 private static void updatestudent(ArrayList<Student1> list) {
  if (list.size() == 0) {
   System.out.println("当前没有学生信息");
   return;
  }
  System.out.println("请输入您想修改的学生学号：");
  String id = sc.next();
  for (int i = 0; i < list.size(); i++) {
   if (id.equals(list.get(i).getStunumber())) {
    System.out.println("请输入新的学号：");
    String stunumberNew = sc.next();
    System.out.println("请输入新的姓名：");
    String nameNew = sc.next();
    System.out.println("请输入新的年龄：");
    int ageNew = sc.nextInt();
    System.out.println("请输入新的性别：");
    boolean sexNew = sc.nextBoolean();
    System.out.println("请输入新的成绩：");
    int scoreNew = sc.nextInt();
    Student1 stu = new Student1(stunumberNew, nameNew, ageNew, sexNew, scoreNew);
    list.set(i, stu);
    System.out.println("修改成功！");
   } else {
    System.out.println("没有找到该学生，请重新输入");
   }
  }
 }

 private static void selectstudent(ArrayList<Student1> list) {
  if (list.size() == 0) {
   System.out.println("当前没有学生信息");
   return;
  }
  System.out.println("请输入您想查询的学生学号：");
  String id = sc.next();
  for (int i = 0; i < list.size(); i++) {
   if (id.equals(list.get(i).getStunumber())) {
    System.out.println("学号：" + list.get(i).getStunumber() + " 姓名：" + list.get(i).getName() + " 年龄："
      + list.get(i).getAge() + " 性别：" + list.get(i).getSex() + " 成绩：" + list.get(i).getScore());
   } else {
    System.out.println("没有找到该学生，请重新输入");
   }
  }
 }
}