Programming Java

Tasks studies - laboratory

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OBJECT-ORIENTED PROGRAMMING

GUI JAVA SWING LABORATORY

JCOMBOBOX, JTABLE, JLIST, JOPTIONPANE, JSCROLLBAR

JCOMBOBOX

public class JComboBox extends JComponent implements ItemSelectable, ListDataListener, ActionListener, Accessible

Commonly used Constructors:

Constructor	Description
`JComboBox()`	Creates a JComboBox with a default data model.
`JComboBox(Object[] items)`	Creates a JComboBox that contains the elements in the specified array.
`JComboBox(Vector<?> items)`	Creates a JComboBox that contains the elements in the specified Vector.

Commonly used methods:

Methods	Description
`void addItem(Object anObject)`	It is used to add an item to the item list.
`void removeItem(Object anObject)`	It is used to delete an item to the item list.
`void removeAllItems()`	It is used to remove all the items from the list.
`void setEditable(boolean b)`	It is used to determine whether the JComboBox is editable.
`void addActionListener(ActionListener a)`	It is used to add the ActionListener.

EXERCISE 1.

Implant the applications as per the view below.

lab3

After selecting the appropriate language from the drop-down list, the text will appear in the label, after pressing the Show button, a massage will appear with information about the selected language.

JTABLE

Commonly used Constructors:

Constructor	Description
`JTable()`	Creates a table with empty cells.
`JTable(Object[][] rows, Object[] columns)`	Creates a table with the specified data.

EXERCISE 2

Design an application based on the view provided below.

lab3

JLIST

```public class JList extends JComponent implements Scrollable, Accessible

```

Commonly used Constructors:

Constructor	Description
`JList()`	Creates a JList with an empty, read-only, model.
`JList(array[] listData)`	Creates a JList that displays the elements in the specified array.
`JList(ListModel<array> dataModel)`	Creates a JList that displays elements from the specified, non-null, model.

Commonly used methods:

Constructor	Description
`void addListSelectionListener(ListSelectionListener listener)`	It is used to add a listener to the list, to be notified each time a change to the selection occurs.
`int getSelectedIndex()`	It is used to return the smallest selected cell index.
`ListModel getModel()`	It is used to return the data model that holds a list of items displayed by the JList component.	`void setListData(Object[] listData)`	It is used to create a read-only ListModel from an array of objects.

EXERCISE 3.

Implement applications according to the view below.

lab3

Tasks to solve independently

Task 1.

You should propose a GUI application, which an example of the appearance is shown below, the application should have the following functionalities:

lab3

• After turning on the application, the Save Existing button is inactive

• After selecting a person from the list, the necessary information appears in the appropriate fields and instead of text 0 yers information about the age of the person appears.

• The user can enter new people by entering data according to requirements and clicking Save New.

• Save Existing allows you to save modified data of a given user.