Hi Friend,

Try the following code:

/*import java.util.Scanner;
public class RegistrationSystem {

public static void main(String[]args){
Scanner scan = new Scanner(System.in);
int menu = 0;
System.out.println("School Registration System Main Menu");
System.out.println();
System.out.println("1. Add a student");
System.out.println("2. Remove a student");
System.out.println("3. Display student list");

System.out.print("Please enter your choice: ");
menu = scan.nextInt();
System.out.println();

switch(menu) {
case 1:
System.out.print("Enter student ID: ");
int ID = scan.nextInt();
System.out.print("Enter your name: ");
String name= scan.next();
}
}
}
*/
import java.io.*;
import java.util.*;

class Student{
public int id;
public String name;

public Student(){}
public Student(int id, String name) {
super();
this.id = id;
this.name = name;
}
public int getId() {
return id;
}
public String getName() {
return name;
}
}
public class RegistrationSystem {

public static void main(String[] args) throws Exception {
List<Student> list = new ArrayList<Student>();
list.add(new Student(1, "A"));
list.add(new Student(2, "B"));
list.add(new Student(3, "C"));
list.add(new Student(4, "D"));

Scanner scan = new Scanner(System.in);
int menu = 0;
System.out.println("School Registration System Main Menu");
System.out.println();
System.out.println("1. Add a student");
System.out.println("2. Remove a student");
System.out.println("3. Display student list");
System.out.println("4. Exit");
boolean quit = false;
do{
System.out.print("Please enter your choice: ");
menu = scan.nextInt();
System.out.println();

switch(menu) {
case 1:
System.out.print("Enter student ID: ");
int ID = scan.nextInt();
System.out.print("Enter your name: ");
String name= scan.next();
list.add(new Student(ID,name));
for (Student s : list){
System.out.println(s.getId()+" " +s.getName());
}
break;
case 2:
System.out.print("Enter Student id to remove the student from list: ");
int id = scan.nextInt();
int i=id-1;
list.remove(i);
break;
case 3:
System.out.println("Id Name");
for (Student s : list){
System.out.println(s.getId()+" " +s.getName());
}
break;
case 4:
quit = true;
break;
default:
System.out.println("Invalid Entry!");
}
}

while (!quit);
}
}

Thanks