import java.util.*;
import java.lang.*;
 
class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
        // array1 having three null elements
		String[] array1 = new String[]{ "hello", "world", "from", "array1", null, null, null };
        // array2 having no null elements
        String[] array2 = new String[]{ "hi", "this", "is", "array2" };
 
        // print array1
        for (String value : array1)
        {
            System.out.println(value);
        }
 
        // swap values
        array1 = array2;
 
        // print array1 again
        for (String value : array1)
        {
            System.out.println(value);
        }
	}
}

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