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import java.awt.Graphics;
import java.awt.List;
// This class is a special version of a scrollable list that
// associates an object with each element in the list.
public class ObjectList extends List
{
Vector objects; // the objects that correspond to list entries
public ObjectList()
{
objects = new Vector();
}
public ObjectList(int items, boolean multiSelect)
{
super(items, multiSelect);
objects = new Vector();
}
public synchronized void addObject(Object ob)
{
// add a string version of the object to the list
super.addItem(ob.toString());
// add the object itself to the object vector
objects.addElement(ob);
}
public synchronized void addObject(Object ob, int position)
{
// add a string version of the object to the list
super.addItem(ob.toString(), position);
// add the object itself to the object vector
if (position >= objects.size()) {
objects.addElement(ob);
} else {
objects.insertElementAt(ob.toString(),
position);
}
}
public synchronized void addObject(String label, Object ob)
{
// Allow the object to be assigned a label independently of the object
super.addItem(label);
objects.addElement(ob);
}
public synchronized void addObject(String label, Object ob,
int position)
{
// Allow the object to be assigned a label independently of the object
super.addItem(label, position);
if (position >= objects.size()) {
objects.addElement(ob);
} else {
objects.insertElementAt(ob.toString(),
position);
}
}
public synchronized void delObject(Object ob)
{
// See if the object is in the vector
int index = objects.indexOf(ob);
// If not, just return
if (index < 0) return;
// Remove the object from the vector
objects.removeElementAt(index);
// Remove the list entry
super.delItem(index);
}
public synchronized Object getSelectedObject()
{
// Get the index of the current selection
int i = getSelectedIndex();
if (i == -1) return null;
// Return the object currently selected
return objects.elementAt(i);
}
public synchronized Object[] getSelectedObjects()
{
// Get the indices of all the selected objects
int[] selectedItems = getSelectedIndexes();
// Create an array of all the selected objects
Object[] whichObjects = new Object[
selectedItems.length];
for (int i=0; i < selectedItems.length; i++) {
whichObjects[i] = objects.elementAt(i);
}
return whichObjects;
}
public int indexOf(Object ob)
{
// Locate a particular object
return objects.indexOf(ob);
}
public Object objectAt(int index)
{
// Return the object at a particular index
return objects.elementAt(index);
}
public void replaceObject(Object ob, int index)
{
// Change a specific entry in the vector
replaceItem(ob.toString(), index);
// Change a specific entry in the list
objects.setElementAt(ob, index);
}
public void replaceObject(String label, Object ob, int index)
{
// Change a specific entry in the vector
replaceItem(label, index);
// Change a specific entry in the list
objects.setElementAt(ob, index);
}
}
C:\jdk1.5.0\mycart>javac ObjectList.java
ObjectList.java:9: cannot find symbol
symbol : class Vector
location: class ObjectList
Vector objects; // the objects that correspond to list entries
^
ObjectList.java:13: cannot find symbol
symbol : class Vector
location: class ObjectList
objects = new Vector();
^
ObjectList.java:19: cannot find symbol
symbol : class Vector
location: class ObjectList
objects = new Vector();
^
Note: ObjectList.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
3 errors
C:\jdk1.5.0\mycart>
