Generate Beeps in Your Application

Generate Beeps in Your Application

Many applications use an audible “beep” sound to signal that an error has occurred or to get the user’s attention for some reason. For example, a user interface that allows the user to enter only a certain number or type of characters into a field (i.e., a field that can only contain numeric values) may “beep” whenever a user presses a key representing an invalid character or when the field is already “full.” To generate beeps in Java, you must first get a reference to an instance of java.awt.Toolkit, at which time you can call its beep() method. For example, the code shown here will generate a beep whenever the displayed Button is pressed:

 import java.awt.*;import java.awt.event.*;public class BeepTest extends Frame implements ActionListener {	public static void main(String[] args) {		BeepTest bt = new BeepTest();		bt.setSize(400, 300);		bt.setVisible(true);	}  //  public static void main(String[] args)	public BeepTest() {		setLayout(new FlowLayout());		Button b = new Button("Click To Beep");		b.addActionListener(this);		add(b);	}  //  public BeepTest()	public void actionPerformed(ActionEvent event) {		Toolkit tk = Toolkit.getDefaultToolkit();		tk.beep();	}  //  public void actionPerformed()}  //  public class BeepTest extends Frame()

In the actionPerformed() method, a reference is obtained to the default Toolkit instance, and its beep() method is called. You can use this technique to enhance your user interface with beep sounds where appropriate.

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