Programming Java

Tasks studies - laboratory

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OBJECT-ORIENTED PROGRAMMING

GUI JAVA SWING LABORATORIUM

JTREE, JTABBEDPANE, JSPLITPANE, JEDITORPANE, JSCROLLBAR

JTREE

public class JTree extends JComponent implements Scrollable, Accessible

Commonly used Constructors:

Constructor	Description
`JTree()`	Creates a JTree with a sample model.
`JTree(Object[] value)`	Creates a JTree with every element of the specified array as the child of a new root node.
`JTree(TreeNode root)`	Creates a JTree with the specified TreeNode as its root, which displays the root node.

ĆWICZENIE 1. Zaimplantuj aplikacje zgodnie z poniższym widokiem.

lab4

Po wybraniu odpowiedniego kursu wyświetli się informacje o nazwie i cenie. Kliknięcie Opłać kurs powoduje pojawienie się okienka do wpisania danych, wyjście zamyka okno.

JTABBEDPANE

public class JTabbedPane extends JComponent implements Serializable, Accessible, SwingConstants

Commonly used Constructors:

Constructor	Description
`JTabbedPane()`	Creates an empty TabbedPane with a default tab placement of JTabbedPane.Top.
`JTabbedPane(int tabPlacement)`	Creates an empty TabbedPane with a specified tab placement.
`JTabbedPane(int tabPlacement, int tabLayoutPolicy)`	Creates an empty TabbedPane with a specified tab placement and tab layout policy.

JSPLITPANE

Commonly used Constructors:

Constructor	Description
`JSplitPane()`	It creates a new JSplitPane configured to arrange the child components side-by-side horizontally, using two buttons for the components.
`JSplitPane(int newOrientation)`	It creates a new JSplitPane configured with the specified orientation.
`JSplitPane(int newOrientation, boolean newContinuousLayout)`	It creates a new JSplitPane with the specified orientation and redrawing style.
`JSplitPane(int newOrientation, boolean newContinuousLayout, Component newLeftComponent, Component newRightComponent)`	It creates a new JSplitPane with the specified orientation and redrawing style, and with the specified components.
`JSplitPane(int newOrientation, Component newLeftComponent, Component newRightComponent)`	It creates a new JSplitPane with the specified orientation and the specified components.

JEDITORPANE

Commonly used Constructors:

Constructor	Description
`JEditorPane()`	It creates a new JEditorPane.
`JEditorPane(String url)`	It creates a JEditorPane based on a string containing a URL specification.
`JEditorPane(String type, String text)`	It creates a JEditorPane that has been initialized to the given text.
`JEditorPane(URL initialPage)`	It creates a JEditorPane based on a specified URL for input.

JSCROLLBAR

public class JScrollBar extends JComponent implements Adjustable, Accessible

Commonly used Constructors:

Constructor	Description
`JScrollBar()`	Creates a vertical scrollbar with the initial values.
`JScrollBar(int orientation)`	Creates a scrollbar with the specified orientation and the initial values.
`JScrollBar(int orientation, int value, int extent, int min, int max)`	Creates a scrollbar with the specified orientation, value, extent, minimum, and maximum.

PRZYKŁAD 1

lab4

package LAB04;
import javax.swing.*;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;

public class JScrollBar extends JFrame{
  private javax.swing.JPanel JPanel;
  private javax.swing.JScrollBar scrollBar1;
  private JLabel label;
  public static void main(String[] args) {
    JScrollBar example = new JScrollBar();
    example.setVisible(true);
  }
  public JScrollBar() {
    super("JScrollBar");
      this.setContentPane(this.JPanel);
      this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      this.setSize(400, 300);
    scrollBar1.addAdjustmentListener(new AdjustmentListener() {
    @Override
      public void adjustmentValueChanged(AdjustmentEvent e) {
        label.setText("Vertical Scrollbar value is:"+
        scrollBar1.getValue());
      }
    });
  }
}

Tasks to solve on your own

Task 1.

Create an application window containing basic GUI components in the layout shown in the diagram below:

lab4

Add the following event handler to the interface designed in this way:

Pressing one of the four buttons should generate the following actions:

• for the “>” button – the selected item is transferred from List 1 to List 2

• for the “»” button – all items are transferred from List 1 to List 2

• for the “<” button – the selected item is transferred from List 2 to List 1

• for the “«” button – all items are transferred from List 2 to List 1

Task 2.

Create an editor application window containing basic GUI components in the layout shown in the diagram provided.

lab4

Add the following event handler to the designed interface:

• selecting one of the six available colors from the drop-down list should allow you to modify the color of the editor text field

• the default color for the editor is gray, while for text - black

• pressing one of the four buttons should generate the following actions:

o for button B - the text in the editor is bolded

o for button I - the text in the editor is tilted

o for button Z - the font size is decreased by -1 each time this button is pressed

o for button P - the font size is increased by +1 each time this button is pressed