Question

How to convert Set of Integers to Array of int in Java

Answer 1

import java.util.Set;
import java.util.Arrays;
import java.util.HashSet;
 
public class MyClass {
    public static int[] convertIntSetToArray(Set<Integer> set) {
        return set.stream()
                    .mapToInt(Integer::intValue)
                    .toArray();
    }
    public static void main(String args[]) {
        Set<Integer> set = new HashSet<>(Arrays.asList(6, 8, 1, 5, 9));
 
        int[] arr = convertIntSetToArray(set);
   
        System.out.println(Arrays.toString(arr));
    }
}
 
 
 
 
/*
run:
 
[1, 5, 6, 8, 9]
 
*/

 

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