How to remove object from linked list [duplicate]

Question

I have a linked list containing all of my students(which are objects)

I want to be able to remove a student based on the id I pass in

Here is my code

import java.util.*;

public class Registry

{
    LinkedList<student> Students = new LinkedList<student>();
    Scanner myObj = new Scanner(System.in);

    public Registry() {
    }

    public void addStudents() {

        System.out.println("Add a new student");
        System.out.println("Enter ForeName");
        String foreName = myObj.nextLine();
        System.out.println("Enter SurName");
        String surName = myObj.nextLine();
        System.out.println("Enter Student ID");
        String studentID = myObj.nextLine();
        System.out.println("Enter Degree Scheme");
        String degreeScheme = myObj.nextLine();
        Students.add(new student(foreName, surName, studentID, degreeScheme));
    }

    public LinkedList<student> getStudents() {
        return Students;
    }

    public void deleteStudent() {
    System.out.println("Enter the ID of the student you want to remove");
    String studentID = myObj.nextLine();
    Students.remove(student)
    }
}

In the deleteStudent method I do not know how to locate the student with the id

I then presume I can just use .remove(student) to remove the student?

How can I locate the student with the id?

Many Thanks for your help

Tobi · Accepted Answer · 2022-04-20 23:27:03Z

0

I think what you can do is iterate through the LinkedList to find a student with same studentID and remove that from the LinkedList.

for(Student student:getStudents()){
    if(student.studentID.equals(studentID)) students.remove(student);
 }

edited Apr 20, 2022 at 23:27

answered Apr 16, 2022 at 10:21

Tobi

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Comments

Turing85 · Accepted Answer · 2022-04-16 10:08:06Z

0

We can use Collection::removeIf:

Students.removeIf(student -> Objects.equals(student.getId(), studentId));

Ideone demo

(The code snippet assumes a getId() method on Student and that the types of studentId and Student::getId are Comparable)

A remark on the code: In java, field names should be written in camleCase (LinkedList<student> Students ... -> LinkedList<student> students ...)

edited Apr 16, 2022 at 10:08

answered Apr 16, 2022 at 9:54

Turing85

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