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 Javaimport 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); }} |
Output
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 Javaimport 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); }} |
Output
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
