1.The java.uti.ArrayList a.Create two instances of ArrayList. One instance must

Question

1.The java.uti.ArrayList

a.Create two instances of ArrayList. One instance must contain only String objects, one instance must contain Book objects.

b. Add a number of String and Book objects to each ArrayList instance.

c.Use each of the following ArrayList methods:

1)isEmpty

2)remove

3)size

4)add

5)iterator

6)listIterator

2. The java.util.LinkedList

a.create two instances of LinkedList. One instance must contain only String objects, one instance must contain only Book objects.

b.Add a number of String and Book objects to each LinkedList instance.

c.use each of the following LinkedList methods:

1)add

2)listIterator

3)iterator

Can anyone help me out please ?

Explanation / Answer

I am only providing anwer to ArrayList part, as the LinkedList one is exactly the same: public static void main(String[] args) { ArrayList books = new ArrayList(); ArrayList strings = new ArrayList(); Book b1 = new Book(100, false, "Lord of the Rings", 120); Book b2 = new Book(200, false, "Book 2", 34); Book b3 = new Book(300, true, "Title 3", 55); String s1= "Hello"; String s2 = "World"; String s3 = "ByeBye!"; System.out.println("Testing begins!"); // empty method System.out.println("Is books empty? " + books.isEmpty()); //add books.add(b1); books.add(b2); books.add(b3); strings.add(s1); strings.add(s2); strings.add(s3); System.out.println("Is strings empty? " + strings.isEmpty()); //size method - as a bonus System.out.println("Books size is now: " + books.size()); //remove strings.remove(0); System.out.println("Strings size is now: " + books.size()); Iterator it = books.iterator(); while(it.hasNext()){ System.out.println(it.next()); } ListIterator it2 = strings.listIterator(); String tmp1 = it2.next(); String tmp2 = it2.previous(); System.out.println("Next equals previous string? " + tmp1.equals(tmp2)); }

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