Create traffic_lights.java

IntScription · IntScription · commit d7477d8176a3 · 2023-08-05T16:47:46.000+05:30
diff --git a/Traffic_Lights/traffic_lights.java b/Traffic_Lights/traffic_lights.java
@@ -0,0 +1,89 @@
+/*
+ * Create a programm to simulate Traffic Lights. The program lets the user
+ * select one of three lights: red, yellow or Green with radio buttons. On
+ * selecting radio button, an appropriate message with “stop” or “Ready” or “GO”
+ * should appear above the button in selected color. Initially, there is no
+ * message Shown.
+ */
+
+package Traffic_Lights;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+class Lights extends JFrame implements ItemListener {
+    public JLabel l1, l2;
+    public JRadioButton r1, r2, r3;
+    public ButtonGroup bg;
+    public JPanel p, p1;
+
+    public Lights() {
+        setLayout(new GridLayout(2, 1));
+        setSize(800, 400);
+
+        p = new JPanel(new FlowLayout());
+        p1 = new JPanel(new FlowLayout());
+
+        l1 = new JLabel();
+        Font f = new Font("Verdana", Font.BOLD, 80);
+        l1.setFont(f);
+        add(l1);
+        p.add(l1);
+
+        add(p);
+
+        l2 = new JLabel("Select Lights");
+        p1.add(l2);
+
+        JRadioButton r1 = new JRadioButton("Red Light");
+        r1.setBackground(Color.red);
+        p1.add(r1);
+        r1.addItemListener(this);
+
+        JRadioButton r2 = new JRadioButton("Yellow Light");
+        r2.setBackground(Color.YELLOW);
+        p1.add(r2);
+        r2.addItemListener(this);
+
+        JRadioButton r3 = new JRadioButton("Green Light");
+        r3.setBackground(Color.GREEN);
+        p1.add(r3);
+        r3.addItemListener(this);
+
+        add(p1);
+
+        bg = new ButtonGroup();
+        bg.add(r1);
+        bg.add(r2);
+        bg.add(r3);
+        setVisible(true);
+    }
+
+    public void itemStateChanged(ItemEvent i) {
+        JRadioButton jb = (JRadioButton) i.getSource();
+        switch (jb.getText()) {
+            case "Red Light": {
+                l1.setText("STOP");
+                l1.setForeground(Color.RED);
+            }
+                break;
+            case "Yellow Light": {
+                l1.setText("Ready");
+                l1.setForeground(Color.YELLOW);
+            }
+                break;
+            case "Green Light": {
+                l1.setText("GO");
+                l1.setForeground(Color.GREEN);
+            }
+                break;
+        }
+    }
+}
+
+public class traffic_lights {
+    public static void main(String[] args){
+        new Lights();
+    }
+}
