How can I take the input and insert it into LINKED LIST in java?

Question

I am trying to make a three different linked list. I will determine the first ones inputs but for the other two I want to ask the user for the inputs and then insert them into a linked list. Can anyone help me with how to do that? So far I could only write this code

package homework001;

 import java.util.Scanner;
 import java.util.List;
 import java.util.LinkedList;
 import java.util.ListIterator;

public class morph {

    public static LinkedList<String> list;
    public static void main(String[] args){
        LinkedList<String> list = new LinkedList<>();
        list.add("10");
        list.add("34");
        list.add("1");
        list.add("97");
        list.add("5");
        list.add("62");     

   }
 }

use a Scanner to take the user input. How many times do you want the user to keep entering data? — Ousmane D.
– Ousmane D., Commented May 5, 2017 at 19:00
If you google "java user input from console" you'll find plenty of tutorials about using Scanner — Alex
– Alex, Commented May 5, 2017 at 19:01
Yes I used Scanner but after that how am I gonna insert all the data that I've got into Linked List that is my rela question — Leenali Li
– Leenali Li, Commented May 5, 2017 at 19:03
@LeenaliLi show the code which is using the scanner then. ^^. — Ousmane D.
– Ousmane D., Commented May 5, 2017 at 19:05

RobC · Accepted Answer · 2021-07-01 15:24:52Z

2

I think we can simply take user input in LinkedList by using this method -> listname.add(sc.nextInt());

code for the implementation is below! thank you :)

public class LL_userInput {

    public static void main(String[] args) {

        LinkedList<Integer> ll = new LinkedList<>(); //creating list
        
        Scanner sc = new Scanner(System.in); //creating scanner for total elements to be inserted in list
        System.out.println("enter total count of elements -> ");
        int num = sc.nextInt(); // user will enter total elements
        
        while(num>0) { 
        ll.add(sc.nextInt());
        num--;  // decrement till the index became 0    
        }
        sc.close();
        System.out.println(ll);
    }
}

edited Jul 1, 2021 at 15:24

RobC

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answered Jul 1, 2021 at 14:57

vibhuSingh

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Comments

Tezra · Accepted Answer · 2017-05-05 19:06:16Z

0

Using scanner, you can get input from any source. To read from console use

Scanner sc = new Scanner(System.in);
while(!sc.hasNextInt()) sc.next();
int number = sc.nextInt();

for(i=0; i< number; i++)
    myList.add(sc.next());

answered May 5, 2017 at 19:06

Tezra

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Comments

2 revs · Accepted Answer · 2017-05-05 19:11:26Z

0

I think you don't understand from the comments here is a simple example ;

public static void main(String[] args) {
    LinkedList<String> list = new LinkedList<>();//declare your list
    Scanner scan = new Scanner(System.in);//create a scanner
    System.out.print("Enter the Nbr of element : ");
    int nbr = scan.nextInt();//read the number of element
    scan.nextLine();
    do {
        list.add(scan.nextLine());//read and insert into your list in one shot
        nbr--;//decrement the index
    } while (nbr > 0);//repeat until the index will be 0

    scan.close();//close your scanner
    System.out.println(list);//print your list

}

edited May 5, 2017 at 19:11

community wiki

2 revs
YCF_L

1 Comment

Leenali Li Over a year ago

Thanks. I guess I didn't at first. I'm a beginner. Sorry for trouble.

Raushan Imam · Accepted Answer · 2022-08-22 05:51:56Z

0

import java.util.*;
class LinkedList{
public static void main(String[] args) {
    Scanner sc= new Scanner (System.in );
    LinkedList<Integer>list=new 
LinkedList<>();
    System.out.println("Enter how many 
elements you want");
    int num=sc.nextInt();
for(int i=0;i<num;i++){
       System.out.println("Enter element 
at index "+i);
list.add(sc.nextInt());
   }
   
 System.out.print(list+" ");

}
}

answered Aug 22, 2022 at 5:51

Raushan Imam

1

1 Comment

Raushan Imam Over a year ago

It's very simple code to understand as beginners

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