StudentManagementSystem.java

import java.util.*;
class Student{
    int id;
    String name;
    int age;
    Student(int id,String name,int age){
        this.id=id;
        this.name=name;
        this.age=age;
    }
}
public class StudentManagementSystem{
    static ArrayList<Student> students =new ArrayList<>();
    static Scanner sc=new Scanner(System.in);
    public static void main(String[] args){
        while(true){
            System.out.println("/n--- Student Management System ---");
            System.out.println("1.Add Student");
            System.out.println("2.View Students");
            System.out.println("3.Delete Students");
            System.out.println("4.Exit");
            System.out.println("Enter choice: ");
            int choice=sc.nextInt();
            switch(choice){
                case 1:addStudent();
                break;
                case 2:viewStudents();
                break;
                case 3:deleteStudent();
                break;
                case 4:
                System.out.println("Exiting: ...Thank you!");
                return;
                default: System.out.println(" Invalid option");
            }
            }
        }
        static void addStudent(){
            System.out.print("Enter ID:");
            int id=sc.nextInt();
            sc.nextLine();
            System.out.print("Enter Name:");
            String name=sc.nextLine();
            System.out.print("Enter age:");
            int age=sc.nextInt();
            students.add(new Student(id,name,age));
            System.out.println("Student added Successfully!");
        }
        static void viewStudents(){
            if(students.isEmpty()){
                System.out.println("NO students found");
                return;
            }
            System.out.println("\nID\tName\tAge");
            for(Student s: students){
                System.out.println(s.id + "\t" + s.name + "\t" + s.age);
            }
        }
        static void deleteStudent(){
            System.out.print("Enter Id to Delete: ");
            int id=sc.nextInt();
            Iterator<Student> it=students.iterator();
            boolean found=false;
            while(it.hasNext()){
                Student s=it.next();
                if(s.id == id){
                    it.remove();
                    found=true;
                    System.out.println(" Student Deleted");
                    break;
                }
            }
            if(!found){
                System.out.println("Student not Found.");
            }
        }
    }