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Код

package com.hp.test;

import javax.swing.*;
import java.io.Serializable;
import java.util.Vector;

public class Main {
    public static void main(String[] args) throws Exception {
        MyComboBoxModel<String> comboBoxModel = new MyComboBoxModel<>(new String[]{"1", "2", "3"});
        JComboBox<String> tableCB = new JComboBox<>(new String[]{"1", "2", "3"});
        comboBoxModel.setElementAt("B", 1);
    }

    public static class MyComboBoxModel<T> extends AbstractListModel<T> implements MutableComboBoxModel<T>, Serializable {
        protected Vector<T> objects;
        protected Object    selectedObject;

        public MyComboBoxModel() {
            objects = new Vector<T>();
        }

        public MyComboBoxModel(T[] items) {
            objects = new Vector<T>(items.length);

            int i, c;
            for (i = 0, c = items.length; i < c; i++) {
                objects.addElement(items[i]);
            }

            if (getSize() > 0) {
                selectedObject = getElementAt(0);
            }
        }

        public MyComboBoxModel(Vector<T> v) {
            objects = v;

            if (getSize() > 0) {
                selectedObject = getElementAt(0);
            }
        }

        public void setSelectedItem(Object anObject) {
            if ((selectedObject != null && !selectedObject.equals(anObject)) ||
                selectedObject == null && anObject != null) {
                selectedObject = anObject;
                fireContentsChanged(this, -1, -1);
            }
        }

        public Object getSelectedItem() {
            return selectedObject;
        }

        public int getSize() {
            return objects.size();
        }

        public T getElementAt(int index) {
            if (index >= 0 && index < objects.size()) {
                return objects.elementAt(index);
            } else {
                return null;
            }
        }

        public int getIndexOf(Object anObject) {
            return objects.indexOf(anObject);
        }

        public void addElement(T anObject) {
            objects.addElement(anObject);
            fireIntervalAdded(this, objects.size() - 1, objects.size() - 1);
            if (objects.size() == 1 && selectedObject == null && anObject != null) {
                setSelectedItem(anObject);
            }
        }

        public void insertElementAt(T anObject, int index) {
            objects.insertElementAt(anObject, index);
            fireIntervalAdded(this, index, index);
        }

        public void setElementAt(T newValue, int index) {
            objects.insertElementAt(newValue, index);
            fireContentsChanged(this, index, index);
        }

        public void removeElementAt(int index) {
            if (getElementAt(index) == selectedObject) {
                if (index == 0) {
                    setSelectedItem(getSize() == 1 ? null : getElementAt(index + 1));
                } else {
                    setSelectedItem(getElementAt(index - 1));
                }
            }

            objects.removeElementAt(index);

            fireIntervalRemoved(this, index, index);
        }

        public void removeElement(Object anObject) {
            int index = objects.indexOf(anObject);
            if (index != -1) {
                removeElementAt(index);
            }
        }

        public void removeAllElements() {
            if (objects.size() > 0) {
                int firstIndex = 0;
                int lastIndex = objects.size() - 1;
                objects.removeAllElements();
                selectedObject = null;
                fireIntervalRemoved(this, firstIndex, lastIndex);
            } else {
                selectedObject = null;
            }
        }
    }
}