Using ArrayList set to realize student management system

Realization idea

Define student classes
Add student code
View student coding
Delete student code
Modify students' code writing
Coding of main interface

Define student classes

Student: Student
Member variables: student number: ID, name, age, address: Address
Construction method: nonparametric construction
Member method: each member variable corresponds to get, set and toString methods

class Student2{
	private int ID=001;
	private static int COUNT=001;
	private String name;
	private String age;
	private String address;
	public Student2() {
		ID = COUNT;
		COUNT++;
	}
	public int getID() {
		return ID;
	}
	public void setID(int iD) {
		ID = iD;
	}
	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 getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	@Override
	public String toString() {
		return "Student2 [ID=" + ID + ", name=" + name + ", age=" + age + ", address=" + address + "]";
	}
}

Add student code writing

Define a method for adding students
A prompt message is displayed to prompt what information to enter
Enter the data required by the student object with the keyboard
Create a student object and assign the data entered by the keyboard to the member variable of the student object
Add student object to collection
Give a prompt of successful addition

	public void addStudnet(ArrayList<Student2> arrayList) {
		System.out.println("Please enter student name:");
		String name=scanner.nextLine();
		System.out.println("Please enter student address:");
		String address=scanner.nextLine();
		System.out.println("Please enter student age:");
		String age=scanner.nextLine();
		Student2 s1=new Student2();
		s1.setName(name);
		s1.setAddress(address);
		s1.setAge(age);
		arrayList.add(s1);
		System.out.println("Student added successfully");
	}

View student code writing

Define a method for viewing student information
Judge whether there is student information
If there is student information, take out the data in the set and display the student information in the corresponding format

	public void findAllStudent(ArrayList<Student2> arrayList) {
		if (arrayList.size()==0) {
			System.out.println("No student information, please add data.");
			return;
		}
		for (int i = 0; i < arrayList.size(); i++) {
			Student2 s2=arrayList.get(i);
			System.out.println(s2.toString());
		}
	}

Delete student code writing

Define a method to delete student information
Display prompt information
Enter the student number to be deleted
Determine whether the student exists
If it exists, traverse the collection and delete the student object from the collection
Prompt for successful deletion

public void deleteStudent(ArrayList<Student2> arrayList) {
		System.out.println("Please enter the student to delete ID:");
		 int deleteId=scanner.nextInt();
		 boolean flag=false;
		for (int i = 0; i < arrayList.size(); i++) {
			Student2 s2=arrayList.get(i);
			if (s2.getID()==deleteId) {
				arrayList.remove(i);
				System.out.println("Delete succeeded");
				flag=true;
				break;
			}
		}
		if (flag==false)
			System.out.println("The information does not exist");
	}

Modify student code writing

Define a method for modifying student information
Display prompt information
Enter the student number to be modified on the keyboard
Determine whether the student exists
If it exists, enter the student information to be modified with the keyboard
Traverse the set and modify the corresponding student information
Prompt for successful modification

public void updateStudent(ArrayList<Student2> arrayList) {
		System.out.println("Please enter the student to modify ID:");
		int updateId=scanner.nextInt();
		boolean flag=false;
		for (int i = 0; i < arrayList.size(); i++) {
			if (arrayList.get(i).getID()==updateId) {
				System.out.println("Please enter the new student name:");
				scanner.nextLine();
				String name=scanner.nextLine();
				System.out.println("Please enter the new age of the student:");
				String age=scanner.nextLine();
				System.out.println("Please enter the student's new address:");
				String address=scanner.nextLine();
				Student2 s1=new Student2();
				s1.setID(updateId);
				s1.setName(name);
				s1.setAddress(address);
				s1.setAge(age);
				arrayList.set(i, s1);
				System.out.println("Update succeeded");
				flag=true;
				break;
			}
		}
		if (flag==false)
			System.out.println("The information does not exist");
	}

Main interface code writing

Write the main interface with output statements
Using Scanner to realize the process of keyboard entry
Complete the selection of operation with switch statement
Complete the cycle and return to the main interface again

public static void main(String[] args) {
		StudentManager sm=new StudentManager();
		ArrayList<Student2> arrayList=new ArrayList<Student2>();
		while (true) {			
			System.out.println("----Welcome to the student management system---");
			System.out.println("1. Add student");
			System.out.println("2. Delete student");
			System.out.println("3. Modify student");
			System.out.println("4. View all students");
			System.out.println("5. sign out");
			System.out.println("Please enter your choice:");
			Scanner scanner=new Scanner(System.in);
			int x=scanner.nextInt();
			switch (x) {
			case 1:
				sm.addStudnet(arrayList);
				break;
			case 2:
				sm.deleteStudent(arrayList);
				break;
			case 3:
				sm.updateStudent(arrayList);
				break;
			case 4:
				sm.findAllStudent(arrayList);
				break;
			case 5:
				System.out.println("Thank you for using");
				System.exit(0);//jvm exit
			}
		}
	}