Question

how do i make a jcombobox affect two cell in a row of jtable in a java program

Answer 1

Answer on Question#49033 - Programming – Java

Question: “how do i make a jcombobox affect two cell in a row of jtable in a java program”.

Answer:

You may do it like this:

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTable;
class JCBaffect2cellOfJTable extends JFrame implements ActionListener{
    public static void main(String[] args) {
        new JCBaffect2cellOfJTable();//create the object of the class
        //JCBaffect2cellOfJTable
    }
    JTable table;//declare the table
    JComboBox<String> jcb;//declare the JComboBox object
    JCBaffect2cellOfJTable(){//create the constructor
        String[] callHeads = {"Column 1", "Column 2", "Column 3"};//initialize the column header
        Object data[][] = {{"Cell 1", "Cell 2", "Cell 3"}};//initialize the data
        table = new JTable(data, callHeads);//create the JTable object
        JScrollPane jsp = new JScrollPane(table);//create the JScrollPane object and add the
        //table
        add(jsp);//add the JScrollPane to the frame
        jcb = new JComboBox<>();//create the JComboBox object
        jcb.addItem("Make a choice"); //add the choice item to the ComboBox
        jcb.addItem("Affect"); //add the item to affect two cells of the row
        jcb.addItem("Don't affect"); //add the item to do nothing
        jcb.addActionListener(this); //registration for the ActionListener
        add(jcb); //add the JComboBox to the frame
        setLayout(new FlowLayout()); //set the layout manager for our frame
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //terminate the application when
        //the window closes
        pack(); //set the size of our frame
        this.setVisible(true); //make visible our object JCBaffect2cellOfJTable
    }
    @Override
    public void actionPerformed(ActionEvent e) {//method of ActionListener interface
    //which we should to override
        String s = (String)jcb.getSelectedItem(); //find out which item was chosen, cast
        //the return value to the type of String and stored in the variable "s"
        if (s.equals("Affect")){ //it was chosen item "Affect"
            table.setValueAt("Changed", 0, 0); //set value "Changed" to the first cell
            table.setValueAt("Changed", 0, 1); //set value "Changed" to the second
            //cell
        }
    }
}

That is, you should to use setValueAt () method for setting of changes in any of the cells.

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