Nested Array list in Java

I am asking user candidate info then i am calling 'addcandidate' method and i am trying to hold candidate info in array list.By the way if user want to add new candidate i am getting again their info and want to add my arraylist.But its holding only last candidate info

my addcandidate method code like this

static  void addcandidate(String name,String surname,String adress,String talent){
    List<List<Object>>listoflist=new ArrayList<>();
    List<Object>candidatelist=new ArrayList<Object>();
    candidatelist.add(name);
    candidatelist.add(surname);
    candidatelist.add(adress);
    candidatelist.add(talent);
    listoflist.add(candidatelist);
    

    System.out.println(listoflist);

}

and also mycode that to ask candidate info like that

  while (true){
        Scanner oku=new Scanner(System.in);
        System.out.println("what kind of process do you want ? 1-Add Candidate 2-Add Employee " +
                "3- add employee from candidate 4-search candidate for talent 5-print wiew");
        int processtype=oku.nextInt();

        if (processtype==1){
            System.out.println("please enter candidate name");
            String cname=oku.next();
            System.out.println("please enter candidate sname");
            String csname=oku.next();
            System.out.println("please enter candidate adress");
            String cadress=oku.next();
            System.out.println("please enter candidate talent");
            String ctalent=oku.next();
            Candidate.addcandidate(cname,csname,cadress,ctalent);
            System.out.println("do you want to continue");
            String answer=oku.next();
            if (answer=="n"){
                break;
            }


        }
    }

my output expectation is like this [[tom,jhn,usa,it],[peter,parker,england,language]]

You need declare listoflist out of method addcandidate. For example like this.

import java.util.ArrayList;
import java.util.List;

public class Main {

    public static List<List<Object>> listoflist = new ArrayList<>();

    public static void main(String[] args) {
        addcandidate("Name 1", "Surname 1", "Street 1", "Music");
        addcandidate("Name 2", "Surname 2", "Street 2", "Singing");
        addcandidate("Name 3", "Surname 3", "Street 3", "Sport");
    }

    public static void addcandidate(String name, String surname, String adress, String talent){
        List<Object> candidatelist = new ArrayList<Object>();
        candidatelist.add(name);
        candidatelist.add(surname);
        candidatelist.add(adress);
        candidatelist.add(talent);
        listoflist.add(candidatelist);


        System.out.println(listoflist);

    }
}

The result of executing this code.

[[Name 1, Surname 1, Street 1, Music]]
[[Name 1, Surname 1, Street 1, Music], [Name 2, Surname 2, Street 2, Singing]]
[[Name 1, Surname 1, Street 1, Music], [Name 2, Surname 2, Street 2, Singing], [Name 3, Surname 3, Street 3, Sport]]

Your listoflist declaration is inside addCandiadte method so each time the array list is being created and finally you are having the list that was created last. Do something like below:

// outside addCandiadte method
 List<List<Object>>listoflist=new ArrayList<>();

static  void addcandidate(String name,String surname,String adress,String talent){
   
    List<Object>candidatelist = new ArrayList<Object>();    
    
    candidatelist.add(name);
    candidatelist.add(surname);
    candidatelist.add(adress);
    candidatelist.add(talent);
    
    listoflist.add(candidatelist);
    

    System.out.println(listoflist);

}

Hope you got the point.
Additionally use List<String>candidatelist instead of List<Object>candidatelist for better readability and type checking.