Pertemuan6 JavaApplets [Compatibility Mode]

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import java.awt.*;

import java.applet.*;

/**

* This class displays "Hello world!" on the applet window. */

public class HelloWorld extends Applet

{ public void paint(Graphics g)

{g.drawString("Hello world!", 10, 10); // writes starting 10 pixels over & down

}

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import java.awt.*;

import java.applet.*;

/**

* This class displays "Hello world!" on the applet window. */

public class HelloWorld extends Applet

{ public void paint(Graphics g)

{ g.drawString("Hello world!", 10, 10); // writes starting 10 pixels over & down

}

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import java.awt.*;

import java.applet.*;

/**

* This class displays "Hello world!" on the applet window. */

public class HelloWorld extends Applet

{

public void paint(Graphics g)

{ g.drawString("Hello world!", 10, 10); // writes starting 10 pixels over & down

}

/

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<html>

<!– COMP519 hello1.html 18.09.2005 -->

<head> <title>Hello World Page</title> </head>

<body>

<p>

You must use a Java-enabled browser to view this applet.

</applet>

</p>

(16)

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<html>

<!– COMP519 hello2.html 18.09.2005 -->

<head>

<title>Hello World Page</title>

</head>

<body>

<p>

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You must use a Java-enabled browser to view this applet.

</applet>

</td></tr>

</table>

</div>

</p>

(17)

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<html>

<!– COMP519 hello3.html 18.09.2005 -->

<head>

<title>Hello World Page</title>

</head>

<body>

<p>

<param name="

name

" value="Chris">

<param name="

age

" value=20>

You must use a Java-enabled browser to view this applet.

</applet>

</td></tr>

</table>

</div>

</p>

</body> </html>

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import java.awt.*;

import java.applet.*;

/**

* This class displays a message based on parameters. */

public class HelloWorld1 extends Applet

{ public void paint(Graphics g)

{ String userName =

getParameter("

name

");

int userAge =

Integer.parseInt(

getParameter("

age

")

)

;

String message1 = "Hello " + userName + ".";

String message2 = "On your next birthday, you will be " +

(userAge+1) + " years old.";

g.drawString(message1, 10, 10);

g.drawString(message2, 10, 30);

}

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System.out.print(“x was changed”);

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if ( myVal > 100 ) {

if ( remainderOn == true) {

myVal = mVal % 100;

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myVal = myVal / 100.0;

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if ( n == 1 ) {

// execute code block #1

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// execute code block #2

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else {

// if all previous tests have failed, execute code block

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if( i == j )

if ( j == k )

System.out.print(“i equals k”);

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System.out.print(“i is not equal to j”);

CORRECT!

if( i == j ) {

if ( j == k )

System.out.print(“i equals k”);

}

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(30)

/

switch ( n ) {

case 1:

// execute code block #1

break;

case 2:

// execute code block #2

break;

default:

// if all previous tests fail then

//execute

code block #4

break;

(31)

3 for ( i = 0; i < n; n++ )

{

// this code body will execute n times

// ifrom 0 to n-1

}

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for ( j = 0; j < 10; j++ ) {

for ( i = 0; i < 20; i++ ){

// this code body will execute 200 times

}

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while(response == 1) {

System.out.print( “ID =” + userID[n]);

n++;

response = readInt( “Enter “);

}

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do {

System.out.print( “ID =” + userID[n] );

n++;

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if ( userID[i] == targetID ) {

index = i;

break;

}

} // program jumps here after break

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if ( userID[i] != -1 ) continue;

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nums[i] = 0; }

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int length()

char charAt(index)

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boolean equals(Object)

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void setColor(Color color)

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(46)

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import java.awt.*;

import java.applet.*;

import java.util.Random;

/**

* This class displays lots of "Hello world!"s on the applet window.

*/

public class HelloWorld2 extends Applet

{

private static final int NUM_WORDS=100;

private static final Color[] colors =

{Color.black,Color.red,Color.blue,Color.green,

Color.yellow};

private static

Random

randy;

private int RandomInRange(int low, int high)

{

return (Math.abs(randy.nextInt()) %

(high-low+1)) + low;

}

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setColor

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}

public void init()

{

randy = new Random();

}

public void paint(Graphics g)

{

for (int i = 0; i < NUM_WORDS; i++) {

int x = RandomInRange(

1 ,

14 0);

int y = RandomInRange(

10 ,

200 );

g.setColor(colors[RandomInRange(0,4)]);

g.drawString("Hello world!", x, y);

}

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// stores applet dimensions

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import java.awt.*; import java.applet.*; import java.util.Random;

/**

* This class displays lots of "Hello world!"s on the applet window. */

public class HelloWorld3 extends Applet {

private static final Color[] colors =

{Color.black,Color.red,Color.blue,Color.green,Color.yellow}; private static Random randy;

private Dimension dim; private int numReps;

private int RandomInRange(int low, int high) {

return (Math.abs(randy.nextInt()) % (high-low+1)) + low; }

public void init()

getParameter

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public void init()

{

randy = new Random();

dim = getSize();

numReps = Integer.parseInt(getParameter("reps")); }

public void paint(Graphics g) {

for (int i = 0; i < numReps; i++) {

int x = RandomInRange(1, dim.width-60);

int y = RandomInRange(10, dim.height);

g.setColor(colors[RandomInRange(0,4)]); g.drawString("Hello world!", x, y);

} }

}

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(49)

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void drawLine(int x1, int y1, int x2, int y2)

void drawRect(int x, int y, int width, int height)

void fillRect(int x, int y, int width, int height)

void drawOval(int x, int y, int width, int height)

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void drawOval(int x, int y, int width, int height)

void fillOval(int x, int y, int width, int height)

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public class Monte1 extends Applet {

private static Random randy; private int NUM_POINTS; private int SIZE;

private int RandomInRange(int low, int high) { CODE OMITTED }

private double distance(int x1, int y1, int x2, int y2) { CODE OMITTED }

public void init() {

NUM_POINTS = Integer.parseInt(getParameter("points")); Dimension dim = getSize();

SIZE = Math.min(dim.width, dim.height); }

init

+

paint

/

g.setColor(Color.red);

g.fillOval(0, 0, SIZE, SIZE);

for (int i = 0; i < NUM_POINTS; i++) { int x = RandomInRange(0, SIZE); int y = RandomInRange(0, SIZE);

if (distance(x, y, SIZE/2, SIZE/2) < SIZE/2) {

g.setColor(Color.white);

} else {

g.setColor(Color.black);

}

g.drawLine(x, y, x, y);

}

You must use a Java-enabled browser... </applet>

(51)

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. . .

private Image offScreenImage;

private Graphics offScreenGraphics; . . .

SIZE = Math.min(dim.width, dim.height);

offScreenImage = createImage(SIZE, SIZE);

offScreenGraphics = offScreenImage.getGraphics();

offScreenGraphics.setColor(Color.red);

offScreenGraphics.fillOval(0, 0, SIZE, SIZE);

init

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# '

@

paint

init

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for (int i = 0; i < NUM_POINTS; i++) { int x = RandomInRange(0, SIZE); int y = RandomInRange(0, SIZE);

if (distance(x, y, SIZE/2, SIZE/2) < SIZE/2) { offScreenGraphics.setColor(Color.white); }

else {

offScreenGraphics.setColor(Color.black); }

offScreenGraphics.drawLine(x, y, x, y); }

}

g.drawImage(offScreenImage, 0, 0, null);

You must use a Java-enabled browser... </applet>

/

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(53)

-;

. . .

public void init() { randy = new Random();

SIZE = Math.min(dim.width, dim.height); }

if (offScreenImage == null) {

offScreenImage = createImage(SIZE, SIZE);

offScreenGraphics = offScreenImage.getGraphics(); offScreenGraphics.setColor(Color.red);

g.setColor(Color.red);

offScreenGraphics.fillOval(0, 0, SIZE, SIZE); g.fillOval(0, 0, SIZE, SIZE);

for (int i = 0; i < NUM_POINTS; i++) { int x = randomInRange(0, SIZE); int y = randomInRange(0, SIZE);

/

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paint

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int y = randomInRange(0, SIZE);

if (distance(x, y, SIZE/2, SIZE/2) < SIZE/2) { offScreenGraphics.setColor(Color.white);

offScreenGraphics.drawLine(x, y, x, y); g.drawLine(x, y, x, y);

}

} else {

g.drawImage(offScreenImage, 0, 0, null); }

} }

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3 nameLabel = new Label("User's name");

add(nameLabel);

nameField = new TextField(20);

nameField.setValue("Dave");

add(nameField);

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FlowLayout

BorderLayout

(55)

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. . .

private Label insideLabel; private TextField insideField; private Label outsideLabel; private TextField outsideField;

randy = new Random(); NUM_POINTS =

Integer.parseInt(getParameter("points")); Dimension dim = getSize();

SIZE = Math.min(dim.width, dim.height);

. . .

insideField.setText("0"); outsideField.setText("0");

. . .

if (distance(x, y, SIZE/2, SIZE/2) < SIZE/2) { g.setColor(Color.white);

setLayout(new BorderLayout());

Panel p = new Panel();

insideLabel = new Label("Inside:"); p.add(insideLabel);

insideField = new TextField(5); p.add(insideField);

outsideLabel = new Label("Outside:"); p.add(outsideLabel);

outsideField = new TextField(5); p.add(outsideField);

add(p, BorderLayout.SOUTH); }

(56)

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ActionListener

public class Monte5 extends Applet implements ActionListener

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dotButton = new Button("Click to generate dots");

dotButton.addActionListener();

6 actionPerformed

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public void actionPerformed(ActionEvent e)

{

if (e.getSource() == dotButton) {

drawDots();

(57)

,

import java.awt.*; import java.applet.*; import java.awt.event.*; import java.util.Random;

public class Monte5 extends Applet

implements ActionListener {

. . .

private Button dotButton;

randy = new Random(); NUM_POINTS =

public void drawCircle() {

CODE FOR DRAWING CIRCLE }

public void drawDots() {

drawCircle();

Graphics g = getGraphics();

for (int i = 0; i < NUM_POINTS; i++) { CODE FOR DRAWING DOTS

} }

Integer.parseInt(getParameter("points")); Dimension dim = getSize();

SIZE = dim.width;

setLayout(new BorderLayout()); dotButton =

new Button("Click to generate dots"); dotButton.addActionListener(this); add(dotButton, BorderLayout.SOUTH);

drawCircle(); }

g.drawImage(offScreenImage, 0, 0, null); }

public void actionPerformed(ActionEvent e) {

if (e.getSource() == dotButton) { drawDots();

} }

}