Question

How to convert Set<Integer> (LinkedHashSet) to int[] (array) in Java

Answer 1

package javaapplication1;

import java.util.LinkedHashSet;
import java.util.Set;

public class Example {
    
    public static void main(String[] args) {
               
        int arr[];
        
        Set<Integer> hashset = new LinkedHashSet<>();
        
        for(int i = 0; i < 5; i++)
            hashset.add(i);
        
        arr = toInt(hashset);
        
        for (int i = 0; i < arr.length; i++)
             System.out.format("%3d", arr[i]);
    }
    public static int[] toInt(Set<Integer> hashset) {
        int[] arr = new int[hashset.size()];
        int i = 0;
        for (Integer val : hashset) arr[i++] = val;
        
        return arr;
    }
}
   
   
/*
run:

0  1  2  3  4
    
*/

 

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