Part 1: If you have not yet submitted the solutions to Lab 5, please include those in this week's submission. If you have already submitted Lab 5, no need to repeat the submission.
Part 2: ArrayLists- Here's a simple test program that creates an ArrayList of String objects and manipulates them. Try it out. Make modifications to the method calls and understand their operations.
No submission required for this exercise.
Warning: Cutting and pasting the code may cause syntax errors!
import java.util.ArrayList; public class ArrayListTest {
public static void main(String[] args) {
ArrayList list = new ArrayList(); // Create a list
// Add elements to the list list.add("America"); // Add it to the list System.out.println("(1) " + list);
list.add(0, "Canada"); // Add it to the beginning of the list System.out.println("(2) " + list);
list.add("Russia"); // Add it to the end of the list System.out.println("(3) " + list);
list.add("France"); // Add it to the end of the list System.out.println("(4) " + list);
list.add(2, "Germany"); // Add it to the list at index 2 System.out.println("(5) " + list);
list.add(5, "Norway"); // Add it to the list at index 5 System.out.println("(6) " + list);
// Remove elements from the list
list.remove("Canada"); // Same as list.remove(0) in this case System.out.println("(7) " + list);
list.remove(2); // Remove the element at index 2 System.out.println("(8) " + list);
list.remove(list.size() - 1); // Remove the last element System.out.println("(9) " + list);
if (list.contains("France"))
System.out.println("France found at index: " + list.indexOf("France"));
System.out.println("What is the element at index 1 ? : " + list.get(1));
}
}
Exercise 1: Write a program that reads words into two ArrayLists list1 and list2 and then creates a third ArrayList that contains words which are common to both list1 and list2. You may assume that the strings are entered as words separated by a space on a single line and the end is signaled by "-1" (String -1). You can use keyboard.next() to read each word.
A sample dialog is shown below:
Enter words on one line, end with -1 java c pascal ada java c++ -1
Enter words on one line, end with -1 c pascal java lisp lisp -1
[java, c, pascal, ada, java, c++] [c, pascal, java, lisp, lisp] Array List with common strings: [c, pascal, java]
Exercise 2: Write a program that reads words into an ArrayList list1 and creates another ArrayList
list2 that has the same words in list1 but no duplicates. A sample dialog is shown below:
Enter words on one line, end with -1 java c pascal ada java java ada c++ -1
Array List with no duplicates: [java, c, pascal, ada, c++]