AP Computer Science: Designing Classes – The Menu Class

A menu object keeps track of a title, menu items and a prompt. See the example below.

Number Types

1. Integer

2. Decimal

3. Fraction

4. Percentage

Enter the number of your choice (1-4):

The handling of this data will be done by the Menu class, as described below.

Data Members

private String title; // title to be displayed above menu

private String prompt; // the prompt to be displayed below the menu

private ArrayList items; // list of items to be shown in menu

private int numItems; // number of items in menu

private int choice; // number entered by user in response to menu

Constructor

public Menu()

// Creates an empty menu

Accessor Methods

public String getTitle()

// Returns the title of the menu.

public String getPrompt()

// Returns the prompt of the menu.

public int getNumItems()

// Returns the number of items in the menu.

public int getChoice()

// Returns the number of the user’s choice.

Modifier Methods

public void setTitle(String t)

// Sets the title to the value in String t

public void setPrompt(String p)

// Sets the prompt to the value in String p

public void addItem(String item)

// Adds the String item to the end of the ArrayList items

public void setChoice(int c)

// Sets the choice number to the int c

Additional Method

public void display()

// Displays the entire contents of the menu: title, items and prompt. The items

// are preceded by an integer from 1 to numItems as shown in the example below.

1. Integer
2. Decimal
3. Fraction
4. Percentage

Use the file MenuTest.java to test out your class. The file is located in the Working with Classes folder.