Answer the Questions(Multiple Choice):

Question 21

Which statement will return the number of rows in a two dimensional array a?

	a.	int a = a.rows
	b.	int a = a.length
	c.	int a = a[i].length
	d.	int a = a.size

2.5 points

Question 22

What statement(s) could you use to declare and instantiate an ArrayList object reference of Book objects named library with a default capacity of 10 elements?

	a.	ArrayList library = new ArrayList();
	b.	ArrayList library; library = new ArrayList();
	c.	both a and b
	d.	neither a or b

2.5 points

Question 23

What method of an arraylist class object returns the number of elements in an ArrayList object?

	a.	size()
	b.	capacity
	c.	length
	d.	length( )

2.5 points

Question 24

After the following code sequence is executed, what are the contents at ArrayList index 1 in a?

ArrayList a = new ArrayList( ); a.add( 7 ); a.add( 10 ); a.add( 21 ); a.set( 1, 4 ); a.remove( 0 );

	a.	10
	b.	7
	c.	4
	d.	21

2.5 points

Question 25

Which of the following is inherited by a subclass

	a.	all instance variables and methods
	b.	public instance variables and methods only
	c.	protected instance variables and methods only
	d.	protected and public instance variables and methods