Table of contents
Implementation of adding student information function
Implementation of the function of deleting student information
Realization of modifying student information function
Realization of querying student information
The realization of the function of obtaining the subscript by ID
The realization of the function of judging whether the ID is unique
student class
package timberman666;
public class Student {
private String id;
private String name;
private int age;
private String address;
public Student() {
}
public Student(String id, String name, int age, String address) {
this.id = id;
this.name = name;
this.age = age;
this.address = address;
}
/**
* 获取
* @return id
*/
public String getId() {
return id;
}
/**
* 设置
* @param id
*/
public void setId(String id) {
this.id = id;
}
/**
* 获取
* @return name
*/
public String getName() {
return name;
}
/**
* 设置
* @param name
*/
public void setName(String name) {
this.name = name;
}
/**
* 获取
* @return age
*/
public int getAge() {
return age;
}
/**
* 设置
* @param age
*/
public void setAge(int age) {
this.age = age;
}
/**
* 获取
* @return address
*/
public String getAddress() {
return address;
}
/**
* 设置
* @param address
*/
public void setAddress(String address) {
this.address = address;
}
public String toString() {
return "Student{id = " + id + ", name = " + name + ", age = " + age + ", address = " + address + "}";
}
}menu
loop:while (true) {
System.out.println("Welcome to the timberman's Student Management System");
System.out.println("1:Add");
System.out.println("2:Delete");
System.out.println("3:Modify");
System.out.println("4:Query");
System.out.println("5:Quit");
System.out.println("Please enter your choice");
Scanner sc=new Scanner(System.in);
String choose= sc.next();
switch (choose)
{
case"1"-> addStudent(list);
case"2"-> deleteStudent(list);
case"3"-> modifyStudent(list);
case"4"-> queryStudent(list);
case"5"-> {
System.out.println("Quit");
break loop;
}
default -> System.out.println("There is no such option");
}
}Implementation of adding student information function
//add student
public static void addStudent(ArrayList<Student> list) {
System.out.println("Add a student");
Student s= new Student();
Scanner sc=new Scanner(System.in);
String id=null;
while (true) {
System.out.println("Please enter the student's id");
id=sc.next();
boolean flag=contains(list,id);
if(flag){
System.out.println("The ID already exists, please re-enter it");
}
else{
s.setId(id);
break;
}
}
System.out.println("Please enter the student's name");
String name=sc.next();
s.setName(name);
System.out.println("Please enter the student's age");
int age= sc.nextInt();
s.setAge(age);
System.out.println("Please enter the student's address");
String address = sc.next();
s.setAddress(address);
list.add(s);
System.out.println("Student information added successfully");
}Implementation of the function of deleting student information
//delete student
public static void deleteStudent(ArrayList<Student> list) {
System.out.println("Delete a student");
Scanner sc=new Scanner(System.in);
String id=sc.next();
int index=getIndex(list,id);
if(index>=0){
list.remove(index);
}
else{
System.out.println("id does not exist, deletion failed");
}
}Realization of modifying student information function
//modify student
public static void modifyStudent(ArrayList<Student> list) {
System.out.println("Modify a student");
Scanner sc=new Scanner(System.in);
String id=sc.next();
int index=getIndex(list,id);
if(index==-1){
System.out.println("The ID to be modified does not exist " +id+ " please re-enter it");
return;
}
Student stu=list.get(index);
System.out.println("Please enter the name of the student you want to modify");
String newName= sc.next();
stu.setName(newName);
System.out.println("Please enter the age of the student you want to modify");
int newAge= sc.nextInt();
stu.setAge(newAge);
System.out.println("Please enter the address of the student you want to modify");
String newAddress= sc.next();
stu.setAddress(newAddress);
System.out.println("The student's information was modified successfully");
}Realization of querying student information
//query student
public static void queryStudent(ArrayList<Student> list) {
System.out.println("Query a student");
if(list.size()==0)
{
System.out.println("There is currently no student information, please add it and inquire");
return;
}
System.out.println("id\t\tname\tage\taddress");
for (int i = 0; i < list.size() ; i++) {
Student stu=list.get(i);
System.out.println(stu.getId()+"\t"+"\t"+stu.getName()+"\t"+stu.getAge()+"\t"+stu.getAddress());
}
}The realization of the function of obtaining the subscript by ID
//Get the index by id
public static int getIndex(ArrayList<Student> list,String id) {
for (int i = 0; i < list.size(); i++) {
Student stu=list.get(i);
String sid= stu.getId();
if(sid.equals(id)) {
return i;
}
}
return -1;
}The realization of the function of judging whether the ID is unique
//Determine whether the id exists in the collection
public static boolean contains(ArrayList<Student> list,String id) {
for (int i = 0; i < list.size(); i++) {
Student s=list.get(i);
String sid=s.getId();
if(sid.equals(id)){
return true;
}
}
return false;
}