Question

How to convert List<Integer> to int[] in Java

Answer 1

import java.util.List;
import java.util.Arrays; 
 
public class MyClass 
{
    public static void main(String[] args) {
 
        List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6);

        int[] array = list.stream().mapToInt(i -> i).toArray();
        
        System.out.println(Arrays.toString(array));
    }
}
  

  
   
/*
run:
   
[1, 2, 3, 4, 5, 6]
   
*/

 

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Answer 2

import java.util.List;
import java.util.Arrays; 
 
public class MyClass 
{
    public static void main(String[] args) {
 
        List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6);

        int[] array = list.stream().mapToInt(Integer::intValue).toArray();
        
        System.out.println(Arrays.toString(array));
    }
}
  

  
   
/*
run:
   
[1, 2, 3, 4, 5, 6]
   
*/

 

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