import java.util.ArrayList;
import java.util.Arrays;
import java.util.StringJoiner;

/**
 * Created by NIK on 27.11.15.
 */
public class Main2 {
    public static void main(String[] args) {

        // income data
        String[] test = new String[] {"to", "be", "or", "not", "to", "be", "hamlet"};
        ArrayList<String> pairsTestList = new ArrayList<>();
        pairsTestList.addAll(Arrays.asList(test));

        System.out.println(pairsTestList.toString());
        System.out.println();

        // Exercise 2 doSwapPairs();



        ArrayList<String> result = new ArrayList<>();

        for (int i = 0; i<pairsTestList.size()-1; i=i+2){
            result.add(pairsTestList.get(i+1));
            result.add(pairsTestList.get(i));
        }

        // last element add if ODD
        if (pairsTestList.size()%2==1) result.add(pairsTestList.get(pairsTestList.size()-1));

        System.out.println(result.toString());
    }
}