How to get a Random Item in a Set in Java - Step by Step Examples

How to get a Random Item in a Set in Java ?

Answer

To get a random item from a set in Java, you can use the `java.util.Random` class along with the `toArray` method of the Set interface.

✐ Examples

1 Get Random Item from Set

In this example,

We import the necessary classes: java.util.Random and java.util.Set.
We create a set named mySet containing elements.
We convert the set to an array using the toArray method.
We generate a random index within the range of the array's length using the nextInt method of the Random class.
We retrieve the random item from the array using the random index.
Finally, we print the random item to standard output.

Java Program

import java.util.Random;
import java.util.Set;
import java.util.HashSet;

public class RandomSetItem {
    public static void main(String[] args) {
        Set<String> mySet = new HashSet<>();
        mySet.add("Apple");
        mySet.add("Banana");
        mySet.add("Orange");
        mySet.add("Mango");

        String[] myArray = mySet.toArray(new String[0]);

        Random random = new Random();
        int randomIndex = random.nextInt(myArray.length);
        String randomItem = myArray[randomIndex];

        System.out.println("Random item from set: " + randomItem);
    }
}

Output

Random item from set: Mango

Summary

In this tutorial, we learned How to get a Random Item in a Set in Java language with well detailed examples.

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