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CHAPTER 12 Graphical User Interface
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Reading Radio Buttons and Check Boxes
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Radio buttons and check boxes are read using the ItemListener, which you ll need to implement in the class that reacts to these GUI elements An ItemListener is very similar to an ActionListener in that a radio button and a check box button have an addItemListener() method that is called to associate the button with the ItemListener Also, as with the addActionListener() method, you must pass the ItemListener() method the this keyword The ItemListener calls the itemStateChanged() method each time the status of the radio button or check box changes Therefore, you need to define an itemStateChanged() method into your program in order to react to these changes The itemStateChanged() method must have one argument an ItemEvent object The following example shows how to react to a check box, which is the same technique used to react to a radio button, only a reference is made to the radio button inside of the check box You change a check box by either selecting the check box or deselecting the check box This is referred to as a state change You can determine what changed by calling the getStateChange() method The getStateChange() method returns an integer that is compared to two ItemEvent constants These are ItemEventSELECTED and ItemEventDESELECTED Let s take a look inside the itemStateChanged() method to see how the getStateChange() method is used The first statement calls the getStateChange() method and assigns the return value to the state integer The value of the state integer is compared to both ItemEvent constants using an if statement Each if statement has a nested if that is used to determine which check box generated the event The getItem() method is called to retrieve a reference to the check box, which is then compared to references of check boxes that we created in the program When there is a match, an appropriate message is displayed in the text area through a call to the setText() method Figure 12-13 shows the window created by this example
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import javaxswing*; import javaawt*; import javaawtevent*; public class Demo { public static void main(String[] args) { Window win = new Window(); }
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} class Window extends JFrame implements ItemListener { JTextArea ta = new JTextArea(2, 25); JCheckBox cb1 = new JCheckBox("Test 1"); JCheckBox cb2 = new JCheckBox("Test 2"); public Window () { super ("Hello world!"); setSize(400,200); setDefaultCloseOperation(JFrameEXIT_ON_CLOSE); setVisible(true); Container ca = getContentPane(); casetBackground(ColorlightGray); FlowLayout flm = new FlowLayout(); casetLayout(flm); cb1addItemListener(this); cb2addItemListener(this); caadd(cb1); caadd(cb2); caadd(ta); setContentPane(ca); } public void itemStateChanged(ItemEvent event) { int state = eventgetStateChange(); if (state == ItemEventSELECTED) { if(eventgetItem() == cb1) tasetText("Test 1 Selected"); if(eventgetItem() == cb2) tasetText("Test 2 Selected"); } if (state == ItemEventDESELECTED) { if(eventgetItem() == cb1) tasetText("Test 1 Deselected"); if(eventgetItem() == cb2) tasetText("Test 2 Deselected"); } } }
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CHAPTER 12 Graphical User Interface
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Figure 12-13
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The status of the check box is read through a call to the getStateChange() method, which is then used to determine the appropriate message to display in the text area
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Reading a Combo Box
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A combo box also uses the ItemListener; therefore, you use the same technique for associating a combo box with the ItemListener as you use to associate a check box with the ItemListener You ll also need to define an itemStateChanged() method Within the itemStateChanged() method, you need to call the getItem() method in order to retrieve the text displayed in the combo box You ll need to convert the return value to a string by using the following statement (note that the getItem() method is prefaced by a reference to the ItemEvent):
String pick = eventgetItem()toString();
The following example shows how to read the contents of a combo box This example displays a combo box and a text area Whenever someone selects a different item from the drop-down list, the ItemListener calls the itemStateChanged() method, where the text appearing in the combo box is retrieved through a call to the getItem() method and then displayed in the text area Figure 12-14 shows what you ll see when you run this example
import javaxswing*; import javaawt*; import javaawtevent*; public class Demo { public static void main(String[] args)
{ Window win = new Window(); }
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