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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