How to set up the loop?

Question

I am trying to create a Frame, using BorderLayout and every time we click the center button, it will change the color in one of the region. But I dont know how to set up the loop to make it change one at a time. Below is my draft......Thanks for helping.......
Test.java
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Test extends Applet implements ActionListener
          Color []color={Color.red,Color.blue,Color.black,Color.green};
          private Button nb=new Button("North Button");
          private Button sb=new Button("South Button");
          private Button eb=new Button("East Button");
          private Button wb=new Button("West Button");
          private Button cb=new Button("Center Button");
          int buttonCount=0;
          public void init()
               setLayout(new BorderLayout());
               add(nb,"North");
               add(sb,"South");
               add(eb,"East");
               add(wb,"West");
               add(cb,"Center");
               cb.addActionListener(this);
               buttonCount=0;
          public void actionPerformed(ActionEvent e)
               for (int i=0;i<color.length;i++)
                    buttonCount++;
                    if (buttonCount%2==0)
                         nb.setBackground(color);
                    if (buttonCount%2==1)
                         sb.setBackground(color[i]);

Answer 1

declare a public variable count;
int count=0;
public void actionPerformed(ActionEvent e)
buttonCount++;
count++;
if(count==color.length)
count=0;
if (buttonCount%2==0)
nb.setBackground(color[count]);
if (buttonCount%2==1)
sb.setBackground(color[count]);
hope you got it.