最近在学习Java，所以写了个学生信息管理系统，话不多说，上代码。
Student.java:
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package com.mumu;public class Student { //定义学生类 private String name; private String age; private String id; private String room_num; private int math; private int english; private int physic; public Student() {//无参构造方法 } public Student(String name, String age, String id, String room_num, int math, int english, int physic) { this.name = name; this.age = age; this.id = id; this.room_num = room_num; this.math = math; this.english = english; this.physic = physic; }//Alt+ INSERT键，可自动生成构造方法 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 getId() { return id; } public void setId(String id) { this.id = id; } public String getRoom_num() { return room_num; } public void setRoom_num(String room_num) { this.room_num = room_num; } public int getMath() { return math; } public int getEnglish() { return english; } public int getPhysic() { return physic; } public void setMath(int math) { this.math = math; } public void setEnglish(int english) { this.english = english; } public void setPhysic(int physic) { this.physic = physic; }} |
StudentManager .java:
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package com.mumu;import java.util.ArrayList;import java.util.Scanner;public class StudentManager { public static void main(String[] args) { ArrayList<Student> array=new ArrayList<>(); menu(array); } public static void menu(ArrayList<Student> array)//菜单 { while(true) { System.out.println("^^^^^^^^welcom to my System^^^^^^^^"); System.out.println("please input your choice"); System.out.println("1.add students' information"); System.out.println("2.remove students' information"); System.out.println("3.revise students' information"); System.out.println("4.look over students' information"); System.out.println("5.find students' information"); System.out.println("6.quit the system"); Scanner sc=new Scanner(System.in); String choice =sc.nextLine(); switch(choice) { case "1": adding(array); break; case "2": removing(array); break; case "3": revising(array); break; case "4": look_over(array); break; case "5": serching(array); case "6": quiting(); break; default: System.out.println("error!"); System.exit(0); } } } public static void adding(ArrayList<Student> array)//添加学生信息 {//录入的学生数据录入给成员变量 System.out.println("please input student's id"); Scanner sc=new Scanner(System.in); String stu_num=sc.nextLine(); if(is_used(array,stu_num)==false) { System.out.println("please input student's name"); String stu_name=sc.nextLine(); System.out.println("please input student's age"); String stu_age=sc.nextLine(); System.out.println("please input student's room number"); String stu_addr=sc.nextLine(); System.out.println("do you want to add student's grade?yes/no"); //创建学生对象 Student st=new Student(); st.setAge(stu_age); st.setId(stu_num); st.setName(stu_name); st.setRoom_num(stu_addr); //添加学生成绩 String cho=sc.nextLine(); if(cho=="yes") { System.out.println("please input student's math grade"); int stu_math=sc.nextInt(); System.out.println("please input student's english grade"); int stu_english= sc.nextInt(); System.out.println("please input student's physic grade"); int stu_physic= sc.nextInt(); st.setMath(stu_math); st.setEnglish(stu_english); st.setPhysic(stu_physic); } //将学生对象添加到集合中 array.add(st); System.out.println("add successfully"); } else { System.out.println("you are already input information of this student"); } } public static void removing(ArrayList<Student> array)//删除学生信息 { Scanner sc=new Scanner(System.in); System.out.println("please input student's number"); String stu_num=sc.nextLine(); for(int i=0;i<array.size();i++) { Student st=array.get(i); if(st.getId().equals(stu_num)) { array.remove(i); break; } else { System.out.println("there is no information of that student"); } } System.out.println("remove successfully"); } public static void revising(ArrayList<Student> array)//修改学生信息 { Scanner sc=new Scanner(System.in); System.out.println("please input stubent's id"); String stu_num=sc.nextLine(); System.out.println("please input student's new name"); String stu_name=sc.nextLine(); System.out.println("please input student's new id"); String stu_id=sc.nextLine(); System.out.println("please input student's new age"); String stu_age=sc.nextLine(); System.out.println("please input student's new room_number"); String stu_add=sc.nextLine(); System.out.println("do you want to revise student's grade?yes/no"); //创建学生对象 Student st1=new Student(); st1.setRoom_num(stu_add); st1.setName(stu_name); st1.setId(stu_id); st1.setAge(stu_age); String cho= sc.nextLine(); if(cho=="yes") { System.out.println("please input student's new math grade"); int stu_math=sc.nextInt(); System.out.println("please input student's new english grade"); int stu_english=sc.nextInt(); System.out.println("please input student's new physic grade"); int stu_physic=sc.nextInt(); st1.setEnglish(stu_english); st1.setMath(stu_math); st1.setPhysic(stu_physic); } for(int i=0;i< array.size();i++) { Student st2=array.get(i); if(st2.getId().equals(stu_num))//判断输入的学号是否在array里面 { array.set(i,st1); break; } else { System.out.println("there is no information of that student"); } } System.out.println("revise successfully"); } public static void look_over(ArrayList<Student> array)//查看所有学生信息 { if(array.size()==0)//先判断集合是否为空 { System.out.println("there is no information,please input information firstly"); } else { System.out.println("number\tname\tage\troom_number\tmath_grade\tenglish_grade\tphysic_grade"); for(int i=0;i<array.size();i++) { Student st=array.get(i); System.out.println(st.getId()+"\t"+st.getName()+"\t"+st.getAge()+"\t"+st.getRoom_num()+"\t" +st.getMath()+"\t"+st.getEnglish()+"\t"+st.getPhysic()); } } } public static void quiting() //退出系统 { System.exit(0); } public static boolean is_used(ArrayList<Student> array,String sid)//判断学号是否重复 { boolean temp=false; for(int i=0;i< array.size();i++) { Student st=array.get(i); if(st.getId().equals(sid)) { temp=true; break; } } return temp; } public static void serching(ArrayList<Student> array)//通过学号查找 { System.out.println("please input id of the student you want to find"); Scanner sc=new Scanner(System.in); String stu_num=sc.nextLine(); for(int i=0;i< array.size();i++) { Student st= array.get(i); if(st.getId().equals(stu_num)) { System.out.println(st.getId()+"\t"+st.getName()+"\t"+st.getAge()+"\t"+st.getRoom_num()+"\t" +st.getMath()+"\t"+st.getEnglish()+"\t"+st.getPhysic()); } else { System.out.println("there is no information of that student"); } } }} |
代码是用IDEA写的，因为是初学者，功能相对简单，如有问题欢迎指正哦。
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原文链接：https://blog.csdn.net/weixin_46739027/article/details/120273515
