学生管理系统（序列化和反序列化）

package com.xaccp.shanjin; import java.io.ObjectOutputStream; import java.util.ArrayList; import java.util.Scanner; import com.xaccp.shanjin.*; public class StudentManager { Scanner scanner = new Scanner(System.in); ArrayList<Student> students = new ArrayList<Student>(); static int amount = 3; public void show() { ArrayList<Student> students = (ArrayList<Student>) Tools .input("users.shanjin"); if (students == null) { students = new ArrayList<Student>(); } System.out.println("姓名\t年龄\t学号\t地址"); for (int i = 0; i < students.size(); i++) { if (students.get(i) != null) { System.out.println(students.get(i).getStuName() + "\t" + students.get(i).getStuAge() + "\t" + students.get(i).getId() + "\t" + students.get(i).getAddress()); } } } public void add() { ArrayList<Student> students = (ArrayList<Student>) Tools .input("users.shanjin"); if (students == null) { students = new ArrayList<Student>(); } Student s = new Student(); System.out.println("请输入姓名:"); String name = scanner.next(); s.setStuName(name); System.out.println("请输入年龄:"); int age = scanner.nextInt(); s.setStuAge(age); System.out.println("请输入学号:"); String id = scanner.next(); s.setId(id); System.out.println("请输入地址:"); String address = scanner.next(); s.setAddress(address); students.add(s); Tools.output(students, "users.shanjin"); } public void delete() { ArrayList<Student> students = (ArrayList<Student>) Tools .input("users.shanjin"); if (students == null) { students = new ArrayList<Student>(); } System.out.println("请输入要删除的学生的学号："); String isDelete = scanner.next(); for (int j = 0; j < students.size(); j++) { if (students.get(j).getId().equals(isDelete)) { students.remove(students.get(j)); System.out.println("删除成功"); break; } } Tools.output(students, "users.shanjin"); } public void modify() { ArrayList<Student> students = (ArrayList<Student>) Tools .input("users.shanjin"); if (students == null) { students = new ArrayList<Student>(); } System.out.println("请输入要修改的学生的学号："); String isModify = scanner.next(); int index = -1; for (int i = 0; i < students.size(); i++) { if (students.get(i).getId().equals(isModify)) { index = i; } } if (index != -1) { System.out.println("有该学生"); System.out.println("姓名[" + students.get(index).getStuName() + "](如果不需要修改请输入n):"); String name = scanner.next(); if (!name.equalsIgnoreCase("n")) { students.get(index).setStuName(name); } System.out.println("年龄[" + students.get(index).getStuAge() + "](如果不需要修改请输入n):"); int age = scanner.nextInt(); if (!name.equalsIgnoreCase("n")) { students.get(index).setStuAge(age); } System.out.println("地址[" + students.get(index).getAddress() + "](如果不需要修改请输入n):"); String address = scanner.next(); if (!name.equalsIgnoreCase("n")) { students.get(index).setAddress(address); } } else { System.out.println("！没有该学生"); } Tools.output(students, "users.shanjin"); } public static void main(String[] args) throws Exception { Scanner scanner = new Scanner(System.in); StudentManager sm = new StudentManager(); ArrayList<Student> students = (ArrayList<Student>) Tools .input("users.shanjin"); if (students == null) { students = new ArrayList<Student>(); } do { System.out.println("1、查看"); System.out.println("2、添加"); System.out.println("3、删除"); System.out.println("4、修改"); System.out.println("5、退出"); System.out.print("请输入："); int num = scanner.nextInt(); if (num == 1) { sm.show(); } else if (num == 2) { sm.add(); System.out.println("添加成功"); } else if (num == 3) { sm.delete(); } else if (num == 4) { sm.modify(); } else if (num == 5) { System.out.println("谢谢使用"); break; } else { System.out.println("输入有误！"); } } while (true); } }