Exercises, class 5

1. Here is a partially coded Chronometer class:

public class Chronometer {

private int hour;

private int minute;

private double second;

…

Code the rest of the class so it has:

• A constructor to initialize the hours, minutes and seconds to 0.
• A constructor to initialize the hours, minutes and seconds to the values passed to the constructor

upon creation of a new Chronometer object.

• 3 getters, one for each attribute
• 3 setters, one for each attribute

2.

a) Code a definition for a class named ChessPiece. Its (public) attributes are:

The name of the piece

Its position on the chess board

b) Code a definition for a class named ChessBoard that represents a chess board. Its attributes are:

the height of the board in number of tiles (m tiles) – private attribute

the width of the board in number of tiles (n tiles) – private attribute

a 2D array of type ChessPiece[][] of m rows by n columns – private attribute

public attributes of type ChessPiece, one for each type of piece on the chess board: the pawn, the king,

the queen, the bishop, the knight, the rook. The value of each piece is the name of the piece.

c) For the ChessBoard class, code a constructor that takes values to initialize these attributes.

d) For the ChessBoard class, code 3 getters, one for each attribute that is not a chess piece.

e) For the ChessBoard class, code 3 setters, one for each attribute that is not a chess piece.

f) How could encapsulation be improved in this program? No code needed here; just answer the

question.

g) How could coupling be reduced in this program? No code needed here; just answer the question.

Exercises, class 6

1. Write a program which:
• creates a new Array List
• adds 5 decimal numbers to it
• prints the list to the screen

2. In the same program, insert an element in the above ArrayList at index 2. The resulting Array List
must be one element larger. Print the resulting list to the screen.

3. In the same program, replace the element in the ArrayList at index 2 by null. Print the resulting list to
the screen.

4. In the same program, remove the element at the last index of the Array List. Print the resulting list to
the screen.

5. In the same program, use a ‘for’ loop to print each element of the Array List to the screen.

6. Create a class named ArrayListManager. Into this class, code a method which prints to the screen
every element of an Array List of strings placed at an odd index. Hint: use a modulus.