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i m trying to make a jcombobox that has 3 colors red, yellow and green.........its a run time error.

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package Exp4;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.JComboBox;
import javax.swing.JFrame;
/**
*
* @author Gursimran
*/
public class combox extends JFrame implements ItemListener{
public combox()
{
JComboBox cb;
setLayout(new GridLayout(10,10));
cb= new JComboBox<>();
cb.addItem("Red");
cb.addItem("Green");
cb.addItem("Blue");
add(cb);
cb.addItemListener(this);
setVisible(true);
setSize(400,400);
}
public static void main(String[] args)
{
combox obj=new combox();
}
public void itemStateChanged(ItemEvent e)
{
if(e.getItemSelectable().equals(0))
{
this.getContentPane().setBackground(Color.red);
}
else if(e.getItemSelectable().equals(1))
{
this.getContentPane().setBackground(Color.green);
}
}
}
Answers
-
Please post the exact error message you get.