I have a table filled with comboboxes,
What I want to do is the folowing: If an element in a combobox is selected, then automatically change the selection on another combo (the reciprocal).
I can't figureout a way to do it. Here I post an image describing what I want to do.
![Matrix automatic JComboboxUpdate](https://i.stack.imgur.com/quU3W.png)

The code of my table is the following:

```
public void createCriteriaMatrix(){

    jTableCriteria = new JTable();

    // COLUMNS
    String[] column = new String[problem.getCriteria()+1];        
    for(int i=0; i<problem.getCriteria()+1; i++){
          column [i] = " "+i;
          if(i==0){
              column [i] = " ";
          }
     }
    // DATA CELLS
   String [][] data = new String[problem.getCriteria()][problem.getCriteria()+1];
    for(int j=0; j<problem.getCriteria()+1; j++){
        for(int i=0; i<problem.getCriteria(); i++){
            data [i][j]=" ";
            if(j==0){
                data [i][j] = " "+(i+1);
            }
        }
    }
    //SOME TABLE FORMAT
    DefaultTableModel model = new DefaultTableModel(data , column ){
        @Override
        public boolean isCellEditable(int row, int column) {
            return column != 0;
        }                
    };

    //Calling to RenderCells() to format cell colors
    jTableCriteria.setDefaultRenderer (Object.class, new RenderCells());    
    jTableCriteria.setModel(model);
    jTableCriteria.getTableHeader().setReorderingAllowed(false);

    this.placeCombosTable();
}

public void placeCombosTable(){
    for(int i=0; i<=problem.getCriteria(); i++){
        for(int j=0; j<=problem.getCriteria(); j++){
            TableColumn weighting= jTableCriteria.getColumnModel().getColumn(i);
            JComboBox comboBox = new JComboBox();
            comboBox.addItem("1");
            comboBox.addItem("2");
            comboBox.addItem("3");
            comboBox.addItem("4");
            comboBox.addItem("5");
            comboBox.addItem("6");
            comboBox.addItem("7");
            comboBox.addItem("1/2");
            comboBox.addItem("1/3");
            comboBox.addItem("1/4");
            comboBox.addItem("1/5");
            comboBox.addItem("1/6");
            comboBox.addItem("1/7");
            if(i==j){
               comboBox.setSelectedIndex(0);
            }
            weighting.setCellEditor(new DefaultCellEditor(comboBox));
        }

    }             
}

```