Question

error correct

Page 11 of 1 // -- // Find 4 or 5 errors on this page. // Source code file Test.java import java.util.ArrayList; import java.util.Iterator; import it313. finalexam. Book; import it313. finalexam. LibraryItem; public class Test3 | private static void main(String[] args) Library Item iteml = new Library Item("A1234"); Book item2 = new Book ("B5678", "Dickens", "Oliver Twist"); ArrayList<Library Item> col = new ArrayList[LibraryItem) ( ); col.append(iteml); col.append(item2); System.out.println(col.size()); for (LibraryItem item in col) ( System.out.print (item + " "); System.out.println(); Iterator<LibraryItem> itr - col.iterator(); while (itr.hasNext()) { System.out.println(itr.next() + " "); System.out.println(col.get(0).isCheckedout()); col.get(0).checkOut(); System.out.println(col[0].isCheckedOut());

Answer 1

Page 1 :

1) private static void main(String args[]) : Main method cannot be private. It should always be declared public.Correct line should be public static void main(String args[])

2)ArrayList<LibraryItem> col = new ArrayList[LibraryItem](): In the second part of this statement, the subscript notation is used [] instead of the generic notation <>. The subscript is used to denote the arrays, here we are using a Collection where we use generic notation. So <> should be used instead of [] in the second part.

3) col.append(item1) and col.append(item2): ArrayList does not have an append method. It should be add instead of append.

4)System.out.println(col[0].isCheckedOut()): This is the last line on the page. Here we are again using the [] subscript notation which should be used with array instead. So this will not work. Correct way should be col.get(0).isCheckedOut();

Page 2 :

1) item1 = LibraryItem("A1234"): Here new keyword is missing which is used when we are creating a new object. Should be new LibraryIem("A1234);

2) assertEquals(item1.toString(), A1234 true): The A1234 should be inside double quotes like this "A1234 true".

3)assertEquals(item2.getAuthor(), "Oliver Twist");); : Here there are 2 paranthesis and semi colons. This is wrong.

Should be just "Oliver Twist");

4)assertEquals(item1.isCheckedOut(), false) : The second line in the testLibraryItem, here it should be true instead of false, as in the next line we are checking out the item, so the value before that must be true, hence here it should be true as well to pass the test case.