Convert LinkedList to String in Java

// Java program to Convert LinkedList to String in Java

import java.util.Iterator;
import java.util.LinkedList;
import java.util.ListIterator;

class GFG {
    public static void main(String[] args)
    {

        // creating a linkedlist
        LinkedList<Integer> list = new LinkedList<>();

        // adding elements to linkedlist
        list.add(100);
        list.add(200);
        list.add(300);
        list.add(400);

        // By using String Class
        String s = "";

        // using iterator for traversing a linkedlist
        Iterator<Integer> iterator = list.iterator();

        while (iterator.hasNext()) {
            // appending using "+" operator
            s = s + iterator.next() + " ";
        }

        // Displaying output
        System.out.println(s);

        // By using String Buffer
        StringBuffer stringBuffer = new StringBuffer();

        // using enhanced for loop for traversing a
        // linkedlist
        for (Integer integer : list) {
          
            // using append method for appending string
            stringBuffer.append(integer).append(" ");
        }

        // displaying output
        System.out.println(stringBuffer);

        // By using String Builder
        StringBuilder stringBuilder = new StringBuilder();

        // using ListIterator for traversing a linked list
        ListIterator<Integer> listIterator
            = list.listIterator();

        while (listIterator.hasNext()) {
          
            // using append method for appending string
            stringBuilder.append(listIterator.next())
                .append(" ");
        }

        // displaying output
        System.out.println(stringBuilder);
    }
}

// Java program to Convert LinkedList to String in Java

import java.util.Iterator;
import java.util.LinkedList;
import java.util.ListIterator;

class friendsDetail {

    // class field
    private String name;
    private String nickName;
    private int id;

    // parameterised constructor
    public friendsDetail(String name, String nickName,
                         int id)
    {
        this.name = name;
        this.nickName = nickName;
        this.id = id;
    }

    // getter for name
    public String getName() { return name; }

    // setter for name
    public void setName(String name) { this.name = name; }

    // getter for marks
    public int getID() { return id; }

    // setter for marks
    public void setID(int id) { this.id = id; }

    // getter for nickname
    public String getNickName() { return nickName; }

    // setter for nickname
    public void setNickName(String nickName)
    {
        this.nickName = nickName;
    }

    //@Override toString method
    public String toString()
    {
        return "name='" + name + '\'' + ", nickName='"
            + nickName + '\'' + ", ID=" + id;
    }
}

class Main {
    public static void main(String[] args)
    {

        LinkedList<friendsDetail> list = new LinkedList<>();

        // adding elements to linked list
        list.add(
            new friendsDetail("Ridhi", "Goda", 202199));
        list.add(
            new friendsDetail("Ananya", "Natki", 202195));
        list.add(new friendsDetail("Ankit", "Chota Don",
                                   202192));
        list.add(
            new friendsDetail("Suraj", "Bhindi", 202147));
        list.add(
            new friendsDetail("Sarthak", "Nagin", 202178));
        list.add(new friendsDetail("Sonika", "Chipkali",
                                   202167));
        list.add(new friendsDetail("Shishya", "Gorilla",
                                   202157));

        System.out.println("Using String Class\n");

        // using string class
        String s = "";

        // using iterator for traversing a linked list
        Iterator<friendsDetail> itr = list.iterator();

        while (itr.hasNext()) {
            // appending string using "+" operator
            s = s + itr.next() + "\n";
        }

        // Displaying output
        System.out.println(s);

        System.out.println("\nUsing String Buffer\n");

        // using string buffer
        StringBuffer stringBuffer = new StringBuffer();

        // using enhanced for loop for linked list traversal
        for (friendsDetail friendmarks : list) {
            // using append method for appending
            stringBuffer.append(friendmarks).append("\n");
        }

        // displaying output
        System.out.println(stringBuffer);

        // using string builder
        System.out.println("\nUsing String Builder\n");

        // using list iterator for traversing a linked list
        ListIterator<friendsDetail> itr2
            = list.listIterator();

        StringBuilder stringBuilder = new StringBuilder();

        while (itr2.hasNext()) {
            // using append method for appending
            stringBuilder.append(itr2.next()).append("\n");
        }

        // displaying output
        System.out.println(stringBuilder);
    }
}