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CHAPTER 12 Graphical User Interface
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lected In contrast, check boxes are not grouped together, enabling a user to select none, all, or a combination of check boxes You create a radio button by declaring an instance of the JRadioButton class Each radio button is uniquely identified within the group by a label You create the label by passing text to the JRadioButton constructor, as shown here:
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JRadioButton rb1 = new JRadioButton("Pass");
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You must also create a radio button group You do this by declaring an instance of the ButtonGroup class, as shown here:
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ButtonGroup passFail = new ButtonGroup();
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You add a radio button to the button group by calling the add() method of the instance of the ButtonGroup class This is shown in the following statement, where the radio button rb1 is added to the button group passFail:
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passFailadd(rb1);
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You then add the button group to the content pane by calling the add() method, as shown in previous examples You create a check box by declaring an instance of the JCheckBox class and passing its constructor the text that will be used as the label for the check box This is shown here:
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JCheckBox cb1 = new JCheckBox("Completed");
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A reference to the check box is passed to the add() method of the content pane in order for the check box to appear in the content pane This is basically the same step used to pass a reference to the button group to the add() method of the content pane Once all the GUI elements are added to the content pane, the setContentPane() method is called and is passed a reference to the content pane
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Figure 12-8
Radio buttons must appear in a button group Check boxes do not have to appear in a button group
The following example shows how to display radio buttons and a check box in the content pane of a window Figure 12-8 shows the window that is displayed when you run the following example:
import javaawt*; import javaxswing*;
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public class Demo { public static void main(String[] args) { Window win = new Window(); } } class Window extends JFrame { public Window () { super ("Window Title"); setSize(400,100); setDefaultCloseOperation(JFrameEXIT_ON_CLOSE); setVisible(true); Container ca = getContentPane(); casetBackground(ColorlightGray); FlowLayout flm = new FlowLayout(); casetLayout(flm); JCheckBox cb1 = new JCheckBox("Completed"); ButtonGroup passFail = new ButtonGroup(); JRadioButton rb1 = new JRadioButton("Pass"); JRadioButton rb2 = new JRadioButton("Fail"); passFailadd(rb1); passFailadd(rb2); caadd(cb1); caadd(rb1); caadd(rb2); setContentPane(ca); } }
Combo Boxes
A combo box is a GUI element that enables the user of your program to select an item from a list of items contained in a drop-down menu You create a combo box by declaring an instance of the JComboBox class, as shown here:
JComboBox combo1 = new JComboBox();
Once the instance is declared, you insert items into the drop-down list by calling the addItem() method defined in JComboBox The addItem() method requires one argument: the text of the item you want added to the combo box The following statement inserts the text One into the instance of the JComboBox called combo1
combo1addItem("One");
CHAPTER 12 Graphical User Interface
Two additional steps are necessary to place the combo box in the container of the window First, you ll need to place the combo box in the content pane by calling the add() method of the content pane Second, you ll place the content pane in the container by calling the setContentPane() method
Figure 12-9
A combo box GUI element contains a drop-down list from which the user of your program selects an item
The following example shows how to create a combo box in a Java program Figure 12-9 shows the window displayed when you run this example
import javaawt*; import javaxswing*; public class Demo { public static void main(String[] args) { Window win = new Window(); } } class Window extends JFrame { public Window () { super ("Window Title"); setSize(400,100); setDefaultCloseOperation(JFrameEXIT_ON_CLOSE); setVisible(true); Container ca = getContentPane(); FlowLayout flm = new FlowLayout(); casetLayout(flm); casetBackground(ColorlightGray); JComboBox combo1 = new JComboBox(); combo1addItem("One"); combo1addItem("Two"); combo1addItem("Three"); caadd(combo1); setContentPane(ca); } }
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