JAVA

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namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
int a, d = 0;
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{

}

private void button2_Click(object sender, EventArgs e)
{


}

private void button3_Click(object sender, EventArgs e)
{


}

private void Form1_Load(object sender, EventArgs e)
{

}

private void timer1_Tick(object sender, EventArgs e)
{
d = d + 1;
a = d % 3;
if (a == 1)
{
button1.BackColor = Color.Green;

button2.BackColor = Color.Transparent;

button3.BackColor = Color.Transparent;
}
if (a == 2)
{
button2.BackColor = Color.Yellow;

button1.BackColor = Color.Transparent;

button3.BackColor = Color.Transparent;
}
if (a == 0)
{
button3.BackColor = Color.Red;

button1.BackColor = Color.Transparent;

button2.BackColor = Color.Transparent;
}
}
}
}