/* * * Append one array list onto the end of another * e.g. if the first array list contains 17 63 41 29 and the second contains 23 99 then * after the append the first array list should contain 17 63 41 29 23 99 * Difficulty: Easy */

import java.util.ArrayList;

public class AppendArrayLists { public static void main(String[] args) { ArrayList a = new ArrayList(); ArrayList b = new ArrayList(); int i;

for (i = 0; i < 5; i++) { /* Initialize array list a to some values */ a.add(i + 3); } System.out.print("a: "); for (i = 0; i < a.size(); i++) { System.out.print(a.get(i) + " "); } System.out.println(); for (i = 0; i < 3; i++) { /* Initialize array list b to some values */ b.add(i + 2); } System.out.print("b: "); for (i = 0; i < b.size(); i++) { System.out.print(b.get(i) + " "); } System.out.println(); // Append b to the end of a append(a, b);

System.out.println("Result of append of a and b is: ");

for (i = 0; i < a.size(); i++) { System.out.print(a.get(i) + " "); } System.out.println(); System.out.println("Expected: 3 4 5 6 7 2 3 4"); a.clear(); for (i = 0; i < 4; i++) { /* Initialize array list a to some values */ a.add(i + 7); } System.out.print("a: "); for (i = 0; i < a.size(); i++) { System.out.print(a.get(i) + " "); } System.out.println(); b.clear(); System.out.print("b: "); for (i = 0; i < b.size(); i++) { System.out.print(b.get(i) + " "); } System.out.println(); // Append b to the end of a append(a, b);

System.out.println("Result of append of a and b is: ");

for (i = 0; i < a.size(); i++) { System.out.print(a.get(i) + " "); } System.out.println(); System.out.println("Expected: 7 8 9 10"); }

/** Append the given ArrayList b to the end of the given ArrayList a @param integer ArrayList a @param integer ArrayList b */ public static void append(ArrayList a, ArrayList b) { //-----------Start below here. To do: approximate lines of code = 3 // append the integer elements in ArrayList b to the end of ArrayList a // Hint: use a for loop that goes through each element of ArrayList b // Hint: google "java ArrayList" to see all the methods you can use. Use the add() method // Hint: the size() method tells you how many elements are stored in the array list //-----------------End here. Please do not remove this comment. Reminder: no changes outside the todo regions. } }