Chapter: Holding Your Objects

Create and populate a List. Create a second List of the same size as the first, and use ListIterators to read elements from the first List and insert them into the second in reverse order.

In Java:

package chapter.holdingYourObjects;

import java.util.*;

public class Exercise12 {
    public static void main(String[] args) {
        List<Integer> x = new ArrayList<Integer>(Arrays.asList(1, 2, 3, 4, 5));
        List<Integer> y = new ArrayList<Integer>(x);
        
        ListIterator<Integer> it = x.listIterator();
        while(it.hasNext()) {
            y.set(x.size() - it.nextIndex() - 1, it.next());
        }
        
        System.out.println("x = " + x);
        System.out.println("y = " + y);
    }
}

/* Output:
* x = [1, 2, 3, 4, 5]
* y = [5, 4, 3, 2, 1]
*/

In Python:

x = [1, 2, 3, 4, 5]
y = x[:]
y.reverse()

print "x = " + str(x)
print "y = " + str(y)

In Lisp:

(defparameter *x* '(1 2 3 4 5))
(defparameter *y* (reverse *x*))

(format t "x = ~s~%" *x*)
(format t "y = ~s"  *y*)