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trafficlight.java
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trafficlight.java
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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class trafficlight {
trafficlight(){
JFrame f = new JFrame();
JButton b1 = new JButton();
b1.setBackground(Color.WHITE);
JButton b2 = new JButton();
b2.setBackground(Color.WHITE);
JButton b3 = new JButton();
b3.setBackground(Color.WHITE);
f.setBackground(Color.WHITE);
f.setLayout(new GridLayout(1,3));
f.add(b1);f.add(b2);f.add(b3);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
f.setSize(500, 200);
b1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
b1.setBackground(Color.RED);
b2.setBackground(Color.WHITE);
b3.setBackground(Color.WHITE);
}
});
b2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
b1.setBackground(Color.WHITE);
b2.setBackground(Color.ORANGE);
b3.setBackground(Color.WHITE);
}
});
b3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
b1.setBackground(Color.WHITE);
b2.setBackground(Color.WHITE);
b3.setBackground(Color.GREEN);
}
});
}
public static void main(String[]args){
new trafficlight();
}
}