CS 245 Lecture 2 – GUIs, Clickture
Agenda
- what ?s
- who you are
- program this
- writing a slideshow application
TODO
- Optional: review CS 145 stuff in chapters 3 and 4 in Core Java.
- Read Core Java 6.3 through 6.4.2 and 7 through 7.2.
- What Swing widget creates a box for editing text?
- 1/4 sheet.
Program This
- Write method
isValidthat reports whether or not anIPAddressis valid. - Write some assert statements for testing
IPAddress.isValid.
Code
IPAddress.java
package lecture01;
import java.util.Random;
public class IPAddress {
private String ip;
public IPAddress(String ip) {
this.ip = ip;
}
public String toString() {
return ip;
}
public boolean isValid() {
String[] quadrants = ip.split("\\.", -1);
if (quadrants.length != 4) {
return false;
}
for (int i = 0; i < 4; ++i) {
try {
int quadrant = Integer.parseInt(quadrants[i]);
if (quadrant < 0 || quadrant > 255) {
return false;
}
} catch (NumberFormatException e) {
return false;
}
}
return true;
}
public boolean isLocal() {
return ip.startsWith("192.168.");
}
}
TestIPAddress.java
package lecture01;
import org.junit.Assert;
import org.junit.Test;
public class TestIPAddress {
@Test
public void testConstructor() {
IPAddress addy = new IPAddress("1.1.1.1");
Assert.assertEquals("toString gave incorrect ip address", "1.1.1.1", addy.toString());
}
@Test
public void testIsLocal() {
IPAddress addy = new IPAddress("1.1.1.1");
Assert.assertFalse(addy.isLocal());
addy = new IPAddress("192.168.0.1");
Assert.assertTrue(addy.isLocal());
}
@Test
public void testIsValid() {
Assert.assertTrue(new IPAddress("1.2.3.4").isValid());
Assert.assertTrue(new IPAddress("10.255.19.4").isValid());
Assert.assertTrue(new IPAddress("0.0.0.0").isValid());
Assert.assertTrue(new IPAddress("0.255.0.255").isValid());
Assert.assertFalse(new IPAddress("0.255.0").isValid());
Assert.assertFalse(new IPAddress("0.-255.0.10").isValid());
Assert.assertFalse(new IPAddress("0.256.0.10").isValid());
Assert.assertFalse(new IPAddress("0.1.0.10.30").isValid());
Assert.assertFalse(new IPAddress("0.25/6.0.10").isValid());
Assert.assertFalse(new IPAddress("foobag").isValid());
Assert.assertFalse(new IPAddress("0..0.10").isValid());
Assert.assertFalse(new IPAddress("0101030").isValid());
Assert.assertFalse(new IPAddress("0.255.0^7.10").isValid());
Assert.assertFalse(new IPAddress("fo.o.ba.g").isValid());
Assert.assertFalse(new IPAddress("").isValid());
}
}
AnnotationExample.java
package lecture02;
public class AnnotationExample {
// @Override
public String toString(int i) {
return "ASdfasdfdsfas";
}
public static void main(String[] args) {
AnnotationExample eg = new AnnotationExample();
System.out.println(eg);
}
}
Clickture.java
package lecture02;
import java.awt.BorderLayout;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class Clickture {
public static void main(String[] args) throws IOException {
JFrame frame = new JFrame("Clickture");
JButton leftButton = new JButton("<");
frame.add(leftButton, BorderLayout.WEST);
JButton rightButton = new JButton(">");
frame.add(rightButton, BorderLayout.EAST);
BufferedImage image = ImageIO.read(new File("/Users/johnch/Desktop/imgs/a.jpg"));
JLabel imageLabel = new JLabel(new ImageIcon(image));
frame.add(imageLabel, BorderLayout.CENTER);
frame.setSize(1000, 700);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
ImageDirectoryCursor.java
package lecture02;
public class ImageDirectoryCursor {
public ImageDirectoryCursor() {
}
}
Haiku
An ideal marriage
One who never makes mistakes
One who fixes them
One who never makes mistakes
One who fixes them