LinkedHashSet is used to maintain the insertion order and for generating random elements from LinkedHashSet we will use Random Class to generate a random number between 0 and the LinkedHashSet size. That random number will act as the index of LinkedHashSet.
We can get a random element in three ways:
- By traversing through the LinkedHashSet using for loop and getting the random element.
- By storing the LinkedHashSet in array and getting the element present at random number index.
- By storing the LinkedHashSet in ArrayList and getting the element at a random number position.
Example 1:
- We will generate the random element from 0 to size of LinkedHashSet size.
- Then we will traverse the LinkedHashSet using for loop and check if the ith index is equal to the random number then print that element.
Java
// Java program to get the random element// from LinkedHashSetimport java.util.LinkedHashSet;import java.util.Random;class GFG { public static void main(String[] args) { LinkedHashSet<String> cset = new LinkedHashSet<>(); // Adding elements to LinkedHashSet cset.add("Paneer Butter Masala"); cset.add("Paneer Lababdar"); cset.add("Kadai Paneer Gravy"); cset.add("Malai Kofta Curry"); cset.add("Palak Paneer"); cset.add("Mughlai Shahi Paneer"); cset.add("Restaurant Style Chilli Paneer"); cset.add("Restaurant Style Matar Paneer"); cset.add("Paneer Tikka Masala"); cset.add("Paneer Makhani"); cset.add("Achari Paneer Gravy"); // This will generate a random number // between 0 and LinkedHashSet size() Random random = new Random(); int randomNumber = random.nextInt(cset.size()); // maintaining the index int count = 0; for (String s : cset) { // when ever our index counter variable "count" // will be equal to the random number it will // print the element at that position in the // LinkedHashSet and after printing we will break // the loop if (count == randomNumber) { System.out.println(s); break; } count++; } }} |
Output
Paneer Butter Masala
Example 2:
- In this approach, we would store the LinkedHashSet in the array and return the element present at random element index.
Java
// Java program to get the random element// from LinkedHashSetimport java.util.LinkedHashSet;import java.util.Random;class GFG { public static void main(String[] args) { LinkedHashSet<String> cset = new LinkedHashSet<>(); // Adding elements to the LinkedHashSet cset.add("Paneer Butter Masala"); cset.add("Paneer Lababdar"); cset.add("Kadai Paneer Gravy"); cset.add("Malai Kofta Curry"); cset.add("Palak Paneer"); cset.add("Mughlai Shahi Paneer"); cset.add("Restaurant Style Chilli Paneer"); cset.add("Restaurant Style Matar Paneer"); cset.add("Paneer Tikka Masala"); cset.add("Paneer Makhani"); cset.add("Achari Paneer Gravy"); Random random = new Random(); int randomNumber = random.nextInt(cset.size()); // creating an array so that we can store // the content of LinkedHashSet String[] csetArray = new String[cset.size()]; csetArray = cset.toArray(csetArray); // printing the element present at position // randoNumber in array csetArray System.out.println(csetArray[randomNumber]); }} |
Output
Achari Paneer Gravy
Example 3:
- In this approach, we would store the LinkedHashSet in the ArrayList and return the element present at a random element position.
Java
// Java program to get the random element// from LinkedHashSetimport java.util.ArrayList;import java.util.LinkedHashSet;import java.util.Random;class GFG { public static void main(String[] args) { LinkedHashSet<String> cset = new LinkedHashSet<>(); // Adding elements to the ArrayList cset.add("Paneer Butter Masala"); cset.add("Paneer Lababdar"); cset.add("Kadai Paneer Gravy"); cset.add("Malai Kofta Curry"); cset.add("Palak Paneer"); cset.add("Mughlai Shahi Paneer"); cset.add("Restaurant Style Chilli Paneer"); cset.add("Restaurant Style Matar Paneer"); cset.add("Paneer Tikka Masala"); cset.add("Paneer Makhani"); cset.add("Achari Paneer Gravy"); Random random = new Random(); int randomNumber = random.nextInt(cset.size()); // Creating an ArrayList and storing all // element of LinkedHashSet into ArrayList ArrayList clist = new ArrayList<>(cset); // Printing the content of arraylist which is // present at index random number System.out.println(clist.get(randomNumber)); }} |
Output
Malai Kofta Curry
