Question

3.) Analyze the Java Program LinkRotator

1. RUN the code and add the screenshot of the window and output.
2. Describe what code change you would make if you wanted each link to be displayed for 2.5 seconds.

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Below is the "LinkRotator" java program:

1: package com.java24hours;
2:
3: import java.awt.*;
4: import java.awt.event.*;
5: import java.io.*;
6: import javax.swing.*;
7: import java.net.*;
8:   
9: public class LinkRotator extends JFrame
10: implements Runnable, ActionListener {
11:
12: String[] pageTitle = new String[6];
13: URI[] pageLink = new URI[6];
14: int current = 0;
15: Thread runner;
16: JLabel siteLabel = new JLabel();
17:
18: public LinkRotator() {
19: setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
20: setSize(300, 100);
21: FlowLayout flo = new FlowLayout();
22: setLayout(flo);
23: add(siteLabel);
24: pageTitle = new String[] {
25: "Oracle's Java site",
26: "Server Side",
27: "JavaWorld",
28: "Java in 24 Hours",
29: "Sams Publishing",
30: "Workbench"
31: };
32: pageLink[0] = getURI("http://www.oracle.com/technetwork/java");
33: pageLink[1] = getURI("http://www.theserverside.com");
34: pageLink[2] = getURI("http://www.javaworld.com");
35: pageLink[3] = getURI("http://www.java24hours.com");
36: pageLink[4] = getURI("http://www.samspublishing.com");
37: pageLink[5] = getURI("http://workbench.cadenhead.org");
38: Button visitButton = new Button("Visit Site");
39: visitButton.addActionListener(this);
40: add(visitButton);
41: setVisible(true);
42: start();
43: }
44:
45: private URI getURI(String urlText) {
46: URI pageURI = null;
47: try {
48: pageURI = new URI(urlText);
49: } catch (URISyntaxException ex) {
50: // do nothing
51: }
52: return pageURI;
54:
55: public void start() {
56: if (runner == null) {
57: runner = new Thread(this);
58: runner.start();
59: }
60: }
61:
62: public void run() {
63: Thread thisThread = Thread.currentThread();
64: while (runner == thisThread) {
65: current++;
66: if (current > 5) {
67: current = 0;
68: }
69: siteLabel.setText(pageTitle[current]);
70: repaint();
71: try {
72: Thread.sleep(2000);
73: } catch (InterruptedException exc) {
74: // do nothing
75: }
76: }
77: }
78:
79: public void actionPerformed(ActionEvent event) {
80: Desktop desktop = Desktop.getDesktop();
81: if (pageLink[current] != null) {
82: try {
83: desktop.browse(pageLink[current]);
84: runner = null;
85: System.exit(0);
86: } catch (IOException exc) {
87: // do nothing
88: }
89: }
90: }
91:   
92: public static void main(String[] arguments) {
93: new LinkRotator();
94: }
95: }

Answer 1

PLEASE GIVE IT A THUMBS UP, I SERIOUSLY NEED ONE, IF YOU NEED ANY MODIFICATION THEN LET ME KNOW, I WILL DO IT FOR YOU

RUN the code and add the screenshot of the window and output.

Output:

​​​​​​​Describe what code change you would make if you wanted each link to be displayed for 2.5 seconds.

To display for 2.5 seconds set Thread.sleep in run() method to 2500

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Code:

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import javax.swing.*;

class LinkRotator extends JFrame implements Runnable, ActionListener {
  String[] pageTitle = new String[6];
  URI[] pageLink = new URI[6];
  int current = 0;
  Thread runner;
  JLabel siteLabel = new JLabel();

  public LinkRotator() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(300, 100);
    FlowLayout flo = new FlowLayout();
    setLayout(flo);
    add(siteLabel);
    pageTitle =
      new String[] {
        "Oracle's Java site",
        "Server Side",
        "JavaWorld",
        "Java in 24 Hours",
        "Sams Publishing",
        "Workbench",
      };
    pageLink[0] = getURI("http://www.oracle.com/technetwork/java");
    pageLink[1] = getURI("http://www.theserverside.com");
    pageLink[2] = getURI("http://www.javaworld.com");
    pageLink[3] = getURI("http://www.java24hours.com");
    pageLink[4] = getURI("http://www.samspublishing.com");
    pageLink[5] = getURI("http://workbench.cadenhead.org");
    Button visitButton = new Button("Visit Site");
    visitButton.addActionListener(this);
    add(visitButton);
    setVisible(true);
    start();
  }

  private URI getURI(String urlText) {
    URI pageURI = null;
    try {
      pageURI = new URI(urlText);
    } catch (URISyntaxException ex) {
      // do nothing
    }
    return pageURI;
  }

  public void start() {
    if (runner == null) {
      runner = new Thread(this);
      runner.start();
    }
  }

  public void run() {
    Thread thisThread = Thread.currentThread();
    while (runner == thisThread) {
      current++;
      if (current > 5) {
        current = 0;
      }
      siteLabel.setText(pageTitle[current]);
      repaint();
      try {
        Thread.sleep(2500);
      } catch (InterruptedException exc) {
        // do nothing
      }
    }
  }

  public void actionPerformed(ActionEvent event) {
    Desktop desktop = Desktop.getDesktop();
    if (pageLink[current] != null) {
      try {
        desktop.browse(pageLink[current]);
        runner = null;
        System.exit(0);
      } catch (IOException exc) {
        // do nothing
      }
    }
  }

  public static void main(String[] arguments) {
    new LinkRotator();
  }
}