/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
        int count = 10_000;  // 1_000 100_000
 
        Integer[] integers = new Integer[ count ];
        for ( int i = 0 ; i < count ; i++ ) {
            integers[ i ] = Integer.valueOf( i );
//            System.out.println( integers[ i ] );
        }
//         System.out.println( Arrays.asList( integers ) );
 
        // First, convert using the old-fashioned way.
        long oldStart = System.nanoTime();
        int[] ints = new int[ count ];
        for ( int i = 0 ; i < integers.length ; i++ ) {
            ints[ i ] = ( null == integers[ i ] ) ? 0 : integers[ i ];  // Auto-boxing converts  the object `Integer` to primitive `int`.
//            System.out.println( ints[ i ] );
        }
        long oldElapsed = ( System.nanoTime() - oldStart );
 
        // Second, convert using modern Streams.
        long newStart = System.nanoTime();
        int[] intsStreamed = Arrays.stream( integers ).mapToInt( i -> i != null ? i : 0 ).toArray();
        long newElapsed = ( System.nanoTime() - newStart );
//        System.out.println( intsStreamed[ 0 ] );         // Check first.
//        System.out.println( intsStreamed[ count - 1 ] ); // Check last.
 
        System.out.println( "oldElapsed: " + oldElapsed );
        System.out.println( "newElapsed: " + newElapsed );
 
	}
}

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