目录
前言：
我对于集合的理解，感觉就类似于顺序表这样的数据结构，然后他存储的数据不能是基本类型，如果要用也只能用对应基本数据的包装类。
对于集合有很多方法，我的建议就是去api里面文档查看就行，没必要可以去背。
源码：
哈哈哈，这个系统太经典了，拿来练习语法再合适不过了~
实体类：
java
public class StudentInfor {
private String id;
private String name;
private int age;
private String sex;
private int MathScore;
private int ChineseSocre;
private int EnglishScore;
private int arrSocre;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public StudentInfor() {
}
public StudentInfor(String id, String name, int age, String sex, int mathScore, int chineseSocre, int englishScore) {
this.id = id;
this.name = name;
this.age = age;
this.sex = sex;
MathScore = mathScore;
ChineseSocre = chineseSocre;
EnglishScore = englishScore;
arrSocre=mathScore+chineseSocre+englishScore;
}
public int getArrSocre() {
return arrSocre;
}
public void setArrSocre() {
arrSocre=MathScore+EnglishScore+ChineseSocre;
}
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 getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public int getMathScore() {
return MathScore;
}
public void setMathScore(int mathScore) {
MathScore = mathScore;
}
public int getChineseSocre() {
return ChineseSocre;
}
public void setChineseSocre(int chineseSocre) {
ChineseSocre = chineseSocre;
}
public int getEnglishScore() {
return EnglishScore;
}
public void setEnglishScore(int englishScore) {
EnglishScore = englishScore;
}
}方法类：
java
import java.util.ArrayList;
import java.util.Scanner;
public class System_Z {
private static void SetInfor(ArrayList<StudentInfor> list)
{
StudentInfor student = new StudentInfor();
Scanner sc=new Scanner(System.in);
System.out.println("请输入姓名->");
student.setName(sc.next());
System.out.println("请输入学号->");
String id=sc.next();
for (int i = 0; i < list.size(); i++) {
while (id.equals(list.get(i).getId())) {
System.out.println("已存在该学号！");
System.out.println("请重新输入");
id = sc.next();
}
}
student.setId(id);
System.out.println("请输入年龄->");
student.setAge(sc.nextInt());
System.out.println("请输入性别->");
student.setSex(sc.next());
System.out.println("请输入语文成绩");
student.setChineseSocre(sc.nextInt());
System.out.println("请输入数学成绩");
student.setMathScore(sc.nextInt());
System.out.println("请输入英语成绩");
student.setEnglishScore(sc.nextInt());
student.setArrSocre();
list.add(student);
}
private static void PrintAllStudent(ArrayList<StudentInfor>list)
{
System.out.println("姓名 id 年龄 性别 语文 数学 英语 总分");
for (int i = 0; i < list.size(); i++) {
/* System.out.println(list.get(i).getName()+" "+list.get(i).getId()+" "+list.get(i).getAge()+" "+list.get(i).getSex()
+" "+list.get(i).getChineseSocre()+"\t"+list.get(i).getMathScore()+" "+list.get(i).getEnglishScore()+" "+list.get(i).getArrSocre());*/
System.out.printf("%-5s%-13s%-6d%-6s%-6d%-6d%-6d%-6d\n",
list.get(i).getName(),list.get(i).getId(),list.get(i).getAge(),list.get(i).getSex()
,list.get(i).getChineseSocre(),list.get(i).getMathScore(),list.get(i).getEnglishScore()
,list.get(i).getArrSocre());
}
}
private static void Print()
{
System.out.println("1.录入学生信息");
System.out.println("2.输入id查看学生信息");
System.out.println("3.输入学生姓名查看学生信息");
System.out.println("4.输入学号修改学生信息");
System.out.println("5.打印全部学生信息");
System.out.println("6.输入学号删除学生信息");
System.out.println("0.退出");
}
private static void FindByName(ArrayList<StudentInfor> list )
{
System.out.println("请输入要查的学生姓名");
Scanner sc=new Scanner(System.in);
String name=sc.next();
int n=0;
for (int i = 0; i < list.size(); i++) {
if(name.equals(list.get(i).getName()))
{
n=1;
System.out.println("学生姓名:"+list.get(i).getName());
System.out.println("学生id:"+list.get(i).getId());
System.out.println("学生年龄:"+list.get(i).getAge());
System.out.println("学生性别:"+list.get(i).getSex());
System.out.println("语文成绩:"+list.get(i).getChineseSocre());
System.out.println("数学成绩:"+list.get(i).getMathScore());
System.out.println("英语成绩:"+list.get(i).getEnglishScore());
System.out.println("总成绩:"+list.get(i).getArrSocre());
System.out.println();
}
}
if(n==0)
{
System.out.println("没找到喵");
System.out.println();
}
}
private static void FindByID(ArrayList<StudentInfor> list )
{
System.out.println("请输入要查的学号");
Scanner sc=new Scanner(System.in);
String id=sc.next();
for (int i = 0; i < list.size(); i++) {
if(id.equals(list.get(i).getId()))
{
System.out.println("学生姓名:"+list.get(i).getName());
System.out.println("学生id:"+list.get(i).getId());
System.out.println("学生年龄:"+list.get(i).getAge());
System.out.println("学生性别:"+list.get(i).getSex());
System.out.println("语文成绩:"+list.get(i).getChineseSocre());
System.out.println("数学成绩:"+list.get(i).getMathScore());
System.out.println("英语成绩:"+list.get(i).getEnglishScore());
System.out.println("总成绩:"+list.get(i).getArrSocre());
System.out.println();
return ;
}
}
System.out.println("没找到喵");
System.out.println();
}
private static void RemakeByname(ArrayList<StudentInfor>list )
{
System.out.println("请输入要修改学生的学号");
Scanner sc=new Scanner(System.in);
String id=sc.next();
for (int i = 0; i < list.size(); i++) {
if(id.equals(list.get(i).getId()))
{
System.out.println("请输入姓名->");
list.get(i).setName(sc.next());
System.out.println("请输入学号->");
list.get(i).setName(sc.next());
System.out.println("请输入年龄->");
list.get(i).setAge(sc.nextInt());
System.out.println("请输入性别->");
list.get(i).setSex(sc.next());
System.out.println("请输入语文成绩");
list.get(i).setChineseSocre(sc.nextInt());
System.out.println("请输入数学成绩");
list.get(i).setMathScore(sc.nextInt());
System.out.println("请输入英语成绩");
list.get(i).setEnglishScore(sc.nextInt());
list.get(i).setArrSocre();
return ;
}
}
}
private static void DeleteByid(ArrayList<StudentInfor>list)
{
System.out.println("请输入要查的学号");
Scanner sc=new Scanner(System.in);
String id=sc.next();
for (int i = 0; i < list.size(); i++) {
if(id.equals(list.get(i).getId()))
{
list.remove(i);
System.out.println("删除成功!");
return ;
}
}
System.out.println("没有查找到该学生信息喵~");
}
private static void main(String[] args) {
ArrayList<StudentInfor> list=new ArrayList<>();
StudentInfor s1=new StudentInfor("2023211661","牢大",24,"男",59,89,100);
StudentInfor s2=new StudentInfor("2023211662","蔡徐坤",25,"男",88,81,66);
list.add(s1);
list.add(s2);
System.out.println("-------欢迎使用学生信息管理系统------");
Scanner sc=new Scanner(System.in);
int choice=100;
while(choice!=0)
{
Print();
choice = sc.nextInt();
switch(choice)
{
case 1:
SetInfor(list);
break;
case 2:
FindByID(list);
break;
case 3:
FindByName(list);
break;
case 4:RemakeByname(list);
break;
case 5:
PrintAllStudent(list);
System.out.println();
break;
case 6:
DeleteByid(list);
break;
case 0:
System.out.println("欢迎下次使用喵~");
break;
default:
System.out.println("选择错误请重新选择");
System.out.println();
break;
}
}
}
}