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 LinkedHashSetÂ
import java.util.LinkedHashSet;import java.util.Random;Â
class GFG {Â Â Â Â public static void main(String[] args)Â Â Â Â {Â Â Â Â Â Â Â Â LinkedHashSet<String> cset = new LinkedHashSet<>();Â
        // 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");Â
        // This will generate a random number        // between 0 and LinkedHashSet size()        Random random = new Random();        int randomNumber = random.nextInt(cset.size());Â
        // 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 LinkedHashSetÂ
import java.util.LinkedHashSet;import java.util.Random;Â
class GFG {Â Â Â Â public static void main(String[] args)Â Â Â Â {Â Â Â Â Â Â Â Â LinkedHashSet<String> cset = new LinkedHashSet<>();Â
        // 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");Â
        Random random = new Random();        int randomNumber = random.nextInt(cset.size());Â
        // 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 LinkedHashSetÂ
import java.util.ArrayList;import java.util.LinkedHashSet;import java.util.Random;Â
class GFG {Â Â Â Â public static void main(String[] args)Â Â Â Â {Â Â Â Â Â Â Â Â LinkedHashSet<String> cset = new LinkedHashSet<>();Â
        // 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");Â
        Random random = new Random();        int randomNumber = random.nextInt(cset.size());Â
        // 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
