學生管理系統

正文

運行系統：
提示：歡迎來到學生管理系統
系統列表展示
（1）查看所有學生 封裝方法
（2）添加學生 封裝方法
（3）刪除學生 封裝方法
（4）修改學生 封裝方法
（5）退出系統 封裝方法

import java.util.ArrayList; import java.util.List; import java.util.stream.Collectors; import java.util.ArrayList; import java.util.Scanner; class Student {private String sno;private String name;private int age;private String home;public String getSno() {return sno;}public void setSno(String sno) {this.sno = sno;}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 String getHome() {return home;}public void setHome(String home) {this.home = home;}//重寫了hashCode()@Overridepublic int hashCode() {final int prime = 31;int result = 1;result = prime * result + age;result = prime * result + ((home == null) ? 0 : home.hashCode());result = prime * result + ((name == null) ? 0 : name.hashCode());result = prime * result + ((sno == null) ? 0 : sno.hashCode());return result;}@Overridepublic boolean equals(Object obj) {if (this == obj)return true;if (obj == null)return false;if (getClass() != obj.getClass())return false;Student other = (Student) obj;if (age != other.age)return false;if (home == null) {if (other.home != null)return false;} else if (!home.equals(other.home))return false;if (name == null) {if (other.name != null)return false;} else if (!name.equals(other.name))return false;if (sno == null) {if (other.sno != null)return false;} else if (!sno.equals(other.sno))return false;return true;}@Overridepublic String toString() {return "Student [sno=" + sno + ", name=" + name + ", age=" + age + ", home=" + home + "]";} } public class StudentManageMent { // 定義學生數組長度，初始長度=0;public static int length=0; // 展示學生public static void showStudents(ArrayList<Student> student,int length){Student s=new Student();if(student.isEmpty()){System.out.println("沒有學生");theShow(student,length);System.out.println("請選擇其他功能");}else{for(int j=0;j<length;j++){ // System.out.println(student.get(j).toString());System.out.println("學生"+(j+1)+"的年齡是: "+student.get(j).getAge()+" 名字是: "+student.get(j).getName()+" 學號是: "+student.get(j).getSno()+" 家庭住址是: "+student.get(j).getHome());}theShow(student,length);}} // 添加學生public static void addStudents(ArrayList<Student> student,int length){System.out.println("請輸入學號");Scanner inSno =new Scanner(System.in);String sno =inSno.next();for(int b=0;b<length;b++){if(sno.equals(student.get(b).getSno())){System.out.println("你輸入的學號已經被占用,請重新輸入");addStudents(student,length);} }Student stu=new Student();stu.setSno(sno);System.out.println("請輸入姓名");Scanner inName =new Scanner(System.in);String name =inSno.next();stu.setName(name); System.out.println("請輸入年齡");Scanner Inage =new Scanner(System.in);int age =inSno.nextInt();stu.setAge(age); System.out.println("請輸入居住地");Scanner inHome =new Scanner(System.in);String home =inSno.next();stu.setHome(home);student.add(stu);length++;theShow(student,length);} // 刪除學生public static void delStudents(ArrayList<Student> a,int length){System.out.println("選擇要刪除學生的學號"); Scanner inSno =new Scanner(System.in);String sno =inSno.next();int time =0;//鎖for(int b=0;b<length;b++){if(sno.equals(a.get(b).getSno())){System.out.println("你輸入的學號存在");a.remove(b);length--;time =1;} }if(time ==1){System.out.println("，已經刪除"); } theShow(a,length);System.out.println("請選擇其他功能"); } // 修改學生public static void setStudents(ArrayList<Student> student,int length){System.out.println("選擇要修改學生的學號"); Student stu =new Student();Scanner inSno =new Scanner(System.in);String sno =inSno.next();int time =0;//鎖for(int b=0;b<length;b++){if(sno.equals(student.get(b).getSno())){System.out.println("你輸入的學號存在");student.remove(b);time =1;stu.setSno(sno); System.out.println("請輸入姓名");Scanner inName =new Scanner(System.in);String name =inSno.next();stu.setName(name); System.out.println("請輸入年齡");Scanner Inage =new Scanner(System.in);int age =inSno.nextInt();stu.setAge(age); System.out.println("請輸入居住地");Scanner inHome =new Scanner(System.in);String home =inSno.next();stu.setHome(home);student.add(stu); } if(time ==1){System.out.println("修改成功");} } theShow(student,length);System.out.println("請選擇其他功能"); } // 退出系統public static void outOfTheSystem(ArrayList<Student> a){ } // theShow()操作系統的小入口，會被多次調用public static void theShow(ArrayList<Student> student,int length){while(true){Scanner sc=new Scanner(System.in);int in=sc.nextInt();switch(in){case 1:showStudents(student,length);break;case 2:addStudents(student,length++);break;case 3:delStudents(student,length);break;case 4:setStudents(student,length);break;case 5:return ; } return ;} } // 主界面public static void managementView(){System.out.println("=====歡迎來到學生管理系統=====");System.out.println("|（1）查看所有學生 |");System.out.println("|（2）添加學生 |");System.out.println("|（3）刪除學生 |");System.out.println("|（4）修改學生 |");System.out.println("|（5）退出系統 |");System.out.println("===========================");} // 主函數public static void main(String[] args) {ArrayList<Student> student=new ArrayList<>(); managementView();theShow(student,length); } }

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