我认为这就是罗宾在您帖子中提到的答案中解释的内容。您将原始组合框模型包装到2个单独的组合框模型中，这些模型依赖于原始组合框的数据元素，但实现了自己的选择模型。
import java.awt.BorderLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.ComboBoxModel;import javax.swing.DefaultComboBoxModel;import javax.swing.JButton;import javax.swing.JComboBox;import javax.swing.Jframe;import javax.swing.JPanel;import javax.swing.SwingUtilities;import javax.swing.event.ListDataEvent;import javax.swing.event.ListDataListener;public class SharedDataBetweenComboBoxSample { public static class MyComboBoxModel extends DefaultComboBoxModel implements ComboBoxModel, ListDataListener { private DefaultComboBoxModel original; public MyComboBoxModel(DefaultComboBoxModel original) { super(); this.original = original; } @Override public int getSize() { return original.getSize(); } @Override public Object getElementAt(int index) { return original.getElementAt(index); } @Override public void addListDataListener(ListDataListener l) { if (getListDataListeners().length == 0) { original.addListDataListener(this); } super.addListDataListener(l); } @Override public void removeListDataListener(ListDataListener l) { super.removeListDataListener(l); if (getListDataListeners().length == 0) { original.removeListDataListener(this); } } @Override public void addElement(Object anObject) { original.addElement(anObject); } @Override public void removeElement(Object anObject) { original.removeElement(anObject); } @Override public int getIndexOf(Object anObject) { return original.getIndexOf(anObject); } @Override public void insertElementAt(Object anObject, int index) { original.insertElementAt(anObject, index); } @Override public void removeAllElements() { original.removeAllElements(); } @Override public void removeElementAt(int index) { original.removeElementAt(index); } @Override public void intervalAdded(ListDataEvent e) { fireIntervalAdded(this, e.getIndex0(), e.getIndex1()); } @Override public void intervalRemoved(ListDataEvent e) { fireIntervalRemoved(this, e.getIndex0(), e.getIndex1()); } @Override public void contentsChanged(ListDataEvent e) { fireContentsChanged(this, e.getIndex0(), e.getIndex1()); } } public static void main(String args[]) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { final String labels[] = { "A", "B", "C", "D", "E", "F", "G" }; final DefaultComboBoxModel model = new DefaultComboBoxModel(labels); Jframe frame = new Jframe("Shared Data"); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); JPanel panel = new JPanel(); JComboBox comboBox1 = new JComboBox(new MyComboBoxModel(model)); comboBox1.setEditable(true); JComboBox comboBox2 = new JComboBox(new MyComboBoxModel(model)); comboBox2.setEditable(true); panel.add(comboBox1); panel.add(comboBox2); frame.add(panel, BorderLayout.NORTH); JButton button = new JButton("Add"); frame.add(button, BorderLayout.SOUTH); ActionListener actionListener = new ActionListener() { @Override public void actionPerformed(ActionEvent actionEvent) { model.addElement("New Added"); } }; button.addActionListener(actionListener); frame.pack(); frame.setVisible(true); } }); }}
