89
90 /**
91 * The index of the current choice for this <code>Choice</code>
92 * or -1 if nothing is selected.
93 * @serial
94 * @see #getSelectedItem()
95 * @see #select(int)
96 */
97 int selectedIndex = -1;
98
99 transient ItemListener itemListener;
100
101 private static final String base = "choice";
102 private static int nameCounter = 0;
103
104 /*
105 * JDK 1.1 serialVersionUID
106 */
107 private static final long serialVersionUID = -4075310674757313071L;
108
109 /**
110 * Creates a new choice menu. The menu initially has no items in it.
111 * <p>
112 * By default, the first item added to the choice menu becomes the
113 * selected item, until a different selection is made by the user
114 * by calling one of the <code>select</code> methods.
115 * @exception HeadlessException if GraphicsEnvironment.isHeadless()
116 * returns true
117 * @see java.awt.GraphicsEnvironment#isHeadless
118 * @see #select(int)
119 * @see #select(java.lang.String)
120 */
121 public Choice() throws HeadlessException {
122 GraphicsEnvironment.checkHeadless();
123 pItems = new Vector();
124 }
125
126 /**
127 * Constructs a name for this component. Called by
128 * <code>getName</code> when the name is <code>null</code>.
694 * @see #writeObject(ObjectOutputStream)
695 */
696 private void readObject(ObjectInputStream s)
697 throws ClassNotFoundException, IOException, HeadlessException
698 {
699 GraphicsEnvironment.checkHeadless();
700 s.defaultReadObject();
701
702 Object keyOrNull;
703 while(null != (keyOrNull = s.readObject())) {
704 String key = ((String)keyOrNull).intern();
705
706 if (itemListenerK == key)
707 addItemListener((ItemListener)(s.readObject()));
708
709 else // skip value for unrecognized key
710 s.readObject();
711 }
712 }
713
714
715 /////////////////
716 // Accessibility support
717 ////////////////
718
719
720 /**
721 * Gets the <code>AccessibleContext</code> associated with this
722 * <code>Choice</code>. For <code>Choice</code> components,
723 * the <code>AccessibleContext</code> takes the form of an
724 * <code>AccessibleAWTChoice</code>. A new <code>AccessibleAWTChoice</code>
725 * instance is created if necessary.
726 *
727 * @return an <code>AccessibleAWTChoice</code> that serves as the
728 * <code>AccessibleContext</code> of this <code>Choice</code>
729 * @since 1.3
730 */
731 public AccessibleContext getAccessibleContext() {
732 if (accessibleContext == null) {
733 accessibleContext = new AccessibleAWTChoice();
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89
90 /**
91 * The index of the current choice for this <code>Choice</code>
92 * or -1 if nothing is selected.
93 * @serial
94 * @see #getSelectedItem()
95 * @see #select(int)
96 */
97 int selectedIndex = -1;
98
99 transient ItemListener itemListener;
100
101 private static final String base = "choice";
102 private static int nameCounter = 0;
103
104 /*
105 * JDK 1.1 serialVersionUID
106 */
107 private static final long serialVersionUID = -4075310674757313071L;
108
109 static {
110 /* ensure that the necessary native libraries are loaded */
111 Toolkit.loadLibraries();
112 /* initialize JNI field and method ids */
113 if (!GraphicsEnvironment.isHeadless()) {
114 initIDs();
115 }
116 }
117
118 /**
119 * Creates a new choice menu. The menu initially has no items in it.
120 * <p>
121 * By default, the first item added to the choice menu becomes the
122 * selected item, until a different selection is made by the user
123 * by calling one of the <code>select</code> methods.
124 * @exception HeadlessException if GraphicsEnvironment.isHeadless()
125 * returns true
126 * @see java.awt.GraphicsEnvironment#isHeadless
127 * @see #select(int)
128 * @see #select(java.lang.String)
129 */
130 public Choice() throws HeadlessException {
131 GraphicsEnvironment.checkHeadless();
132 pItems = new Vector();
133 }
134
135 /**
136 * Constructs a name for this component. Called by
137 * <code>getName</code> when the name is <code>null</code>.
703 * @see #writeObject(ObjectOutputStream)
704 */
705 private void readObject(ObjectInputStream s)
706 throws ClassNotFoundException, IOException, HeadlessException
707 {
708 GraphicsEnvironment.checkHeadless();
709 s.defaultReadObject();
710
711 Object keyOrNull;
712 while(null != (keyOrNull = s.readObject())) {
713 String key = ((String)keyOrNull).intern();
714
715 if (itemListenerK == key)
716 addItemListener((ItemListener)(s.readObject()));
717
718 else // skip value for unrecognized key
719 s.readObject();
720 }
721 }
722
723 /**
724 * Initialize JNI field and method IDs
725 */
726 private static native void initIDs();
727
728 /////////////////
729 // Accessibility support
730 ////////////////
731
732
733 /**
734 * Gets the <code>AccessibleContext</code> associated with this
735 * <code>Choice</code>. For <code>Choice</code> components,
736 * the <code>AccessibleContext</code> takes the form of an
737 * <code>AccessibleAWTChoice</code>. A new <code>AccessibleAWTChoice</code>
738 * instance is created if necessary.
739 *
740 * @return an <code>AccessibleAWTChoice</code> that serves as the
741 * <code>AccessibleContext</code> of this <code>Choice</code>
742 * @since 1.3
743 */
744 public AccessibleContext getAccessibleContext() {
745 if (accessibleContext == null) {
746 accessibleContext = new AccessibleAWTChoice();
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