目录
学生类
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 + "}";
}
}菜单
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");
}
}添加学生信息功能的实现
//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");
}删除学生信息功能的实现
//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");
}
}修改学生信息功能的实现
//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");
}查询学生信息的实现
//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());
}
}通过ID获得下标功能的实现
//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;
}判断ID是否唯一功能的实现
//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;
}