Convert LinkedList to String in Java

28 Mar, 2022
A LinkedList is a linear data structure, in which the elements are not stored at contiguous memory locations.
For converting a linked list to a string we need to traverse the linked list and after that, we need to append the element of the linked list to the string variable.
We can use String class, StringBuilder, or StringBuffer for converting a LinkedList to string.
For appending string we can use the “+” operator for the String class and append method for StringBuffer and StringBuilder.
Example 1:
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);    }}
100 200 300 400 
100 200 300 400 
100 200 300 400 
Example 2:In this example, we will use a user-defined class
Java
// 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);    }}
Using String Class

name='Ridhi', nickName='Goda', ID=202199
name='Ananya', nickName='Natki', ID=202195
name='Ankit', nickName='Chota Don', ID=202192
name='Suraj', nickName='Bhindi', ID=202147
name='Sarthak', nickName='Nagin', ID=202178
name='Sonika', nickName='Chipkali', ID=202167
name='Shishya', nickName='Gorilla', ID=202157


Using String Buffer

name='Ridhi', nickName='Goda', ID=202199
name='Ananya', nickName='Natki', ID=202195
name='Ankit', nickName='Chota Don', ID=202192
name='Suraj', nickName='Bhindi', ID=202147
name='Sarthak', nickName='Nagin', ID=202178
name='Sonika', nickName='Chipkali', ID=202167
name='Shishya', nickName='Gorilla', ID=202157


Using String Builder

name='Ridhi', nickName='Goda', ID=202199
name='Ananya', nickName='Natki', ID=202195
name='Ankit', nickName='Chota Don', ID=202192
name='Suraj', nickName='Bhindi', ID=202147
name='Sarthak', nickName='Nagin', ID=202178
name='Sonika', nickName='Chipkali', ID=202167
name='Shishya', nickName='Gorilla', ID=202157
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