/**
* Reads the <code>ObjectInputStream</code> and if it isn't <code>null</code> adds a listener to
* receive action events fired by the button. Unrecognized keys or values will be ignored.
*
* @param s the <code>ObjectInputStream</code> to read
* @exception HeadlessException if <code>GraphicsEnvironment.isHeadless</code> returns <code>true
* </code>
* @serial
* @see #removeActionListener(ActionListener)
* @see #addActionListener(ActionListener)
* @see java.awt.GraphicsEnvironment#isHeadless
* @see #writeObject(ObjectOutputStream)
*/
private void readObject(ObjectInputStream s)
throws ClassNotFoundException, IOException, HeadlessException {
GraphicsEnvironment.checkHeadless();
s.defaultReadObject();
Object keyOrNull;
while (null != (keyOrNull = s.readObject())) {
String key = ((String) keyOrNull).intern();
if (actionListenerK == key) addActionListener((ActionListener) (s.readObject()));
else // skip value for unrecognized key
s.readObject();
}
}
/**
* Constructs a button with the specified label.
*
* @param label a string label for the button, or <code>null</code> for no label
* @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
* @see java.awt.GraphicsEnvironment#isHeadless
*/
public Button(String label) throws HeadlessException {
GraphicsEnvironment.checkHeadless();
this.label = label;
}