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FAQ

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Panel , Panel -, , . .

Window ( ), , . Frame. Frame , , .

Swing JPanel JFrame. Canvas, , , Component.

, . , Java, Internet, , HTML. , , " ", , , . HTML- appletviewer. . , . , , ( ). Applet . Applet java.applet AWT JApplet Swing.

Applet, Web-. main(), init(). init() . start() , , . stop() , Web-, . destroy() , . , paint() Component. paint() , , repaint(), .

, init(), paint(), setColor() drawString() .

/* # 1: : DateApplet.java */

package chapt11;

import java.awt.Color;

import java.awt.Graphics;

import java.util.Calendar;

import java.util.Formatter;

import javax.swing.JApplet;

 

public class DateApplet extends JApplet {

private Formatter dateFmt = new Formatter();

private Formatter timeFmt = new Formatter();

 

public void init() {

setSize(180, 100);

Calendar c = Calendar.getInstance();

String era = "";

if (c.get(Calendar.ERA) == 1)

era = "..";

dateFmt.format("%tA %td.%tm.%tY "

+ era, c, c, c, c);

timeFmt.format("%tT", c);

}

public void paint(Graphics g) {

g.setColor(Color.RED);

g.drawString(" " + timeFmt,

10, getHeight()/2);

g.setColor(new Color(0,87,127));

g.drawString(dateFmt.toString(), 13,

getHeight() - 10);

}

}

. 11.2.

java.util.Calendar. Color.

, - , <applet > </applet> HTML. :

<html>

<applet code = chapt11.DateApplet.class

width = 250 height = 250> </applet></html>

HTML- , .

, setColor(), drawString(), java.awt.Graphics. Graphics , . Graphics ( ) , , . update() paint().

Graphics:

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

drawRect(int x, int y, int width, int height) fillRect(int x, int y, int width, int height) ;

draw3DRect(int x, int y, int width, int height, boolean raised) ;

drawRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight) ;

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

drawPolygon(int[] xPoints, int[] yPoints, int nPoints) (), x y;

drawPolygon(Polygon p) , Polygon;

drawPolyline(int[] xPoints, int[] yPoints, int nPoints) , x y;

drawArc(int x, int y, int width, int height, int startAngle, int arcAngle) ;

drawImage(Image img, int x, int y, Color bgcolor, ImageObserver observer) ;

drawString(String str, int x, int y) ;

setColor(Color c), getColor() ;

getFont() ;

setFont(Font font) .

Graphics Applet, JApplet.

24, , Graphics .

/* # 2: : ThrRect.java */

package chapt11;

import java.awt.Color;

import java.awt.Graphics;

import javax.swing.JApplet;

 

public class ThrRect extends JApplet {

public void draw3D(Graphics g, int x, int y, int width, int height, boolean isRaised, boolean isFilled) {

g.draw3DRect(x, y, width - 1, height - 1,

isRaised);

g.draw3DRect(x + 1, y + 1, width - 3,

height - 3, isRaised);

g.draw3DRect(x + 2, y + 2, width - 5,

height - 5, isRaised);

if (isFilled)

g.fillRect(x + 3, y + 3, width - 6,

height - 6);

}

public void paint(Graphics g) {

g.setColor(Color.GRAY);

draw3D(g, 10, 5, 80, 40, true, false);

draw3D(g, 130, 5, 80, 40, false, false);

draw3D(g, 10, 55, 80, 40, true, true);

draw3D(g, 130, 55, 80, 40, false, true);

}

}

. 11.3.

java.awt , : Color, Font, Image, Shape, Canvas .. , java.awt.geom, java.awt.color, java.awt.image .

/* # 3: : BuildShape.java */

package chapt11;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Shape;

import java.awt.geom.*;

import javax.swing.JApplet;

 

public class BuildShape extends JApplet {

public void init() {

setSize(200, 205);

}

public void paint(Graphics g) {

Graphics2D g2 = (Graphics2D) g;

setBackground(Color.LIGHT_GRAY);

g2.rotate(Math.PI / 6);

drawChessBoard(g);

//

g2.rotate(-Math.PI / 6);

g.setXORMode(new Color(200, 255, 250));

Shape e = new Ellipse2D.Float(70, 75, 70, 50);

//

g2.fill(e);

}

//

public void drawChessBoard(Graphics g) {

int size = 16;

for (int y = 0; y < 8; y++) {

for (int x = 0; x < 8; x++) {

if ((x + y) % 2 == 0)

g.setColor(Color.BLUE);

Else

g.setColor(Color.WHITE);

g.fillRect(75 + x * size, y * size - 25, size, size);

}

g.setColor(Color.BLACK);

 

g.drawString(new Character(

(char) ('8' - y)).toString(), 66, y * size - 13);

g.drawString(new Character(

(char) (y + 'a')).toString(),

79 + y * size, 8 * size - 14);

}

}

}

. 11.4.

// # 4: GIF-: DrawImage.java

package chapt11;

import java.awt.Graphics;

import java.awt.Image;

import javax.swing.JApplet;

 

public class DrawImage extends JApplet {

private Image img;

 

public void init() {

//

img = getImage(getCodeBase(), "joli.gif");

}

public void paint(Graphics g){

g.drawImage(img, 0, 0, this);

}

}

<applet> HTML- . HTML- :

<html><head><title> </title></head>

<body>

<applet code=test.com.ReadParam.class

width=250 height=300>

<param name = bNumber value = 4>

<param name = state value = true>

</applet> </body> </html>

bNumber state :

/* # 5: : ReadParam.java */

package chapt11;

import java.awt.Color;

import java.awt.Graphics;

import java.applet.Applet;

public class ReadParam extends Applet {

private int bNum;

private boolean state;

 

public void start() { //

String param;

param = getParameter("state");

if (param!= null)

state = new Boolean(param);

try {

param = getParameter("bNumber");

if (param!= null)

bNum = Integer.parseInt(param);

} catch (NumberFormatException e) {

bNum = 0;

state = false;

}

}

public void paint(Graphics g) {

double d = 0;

if (state) d = Math.pow(bNum, 2);

else g.drawString("Error Parameter", 0, 11);

g.drawString("Statement: " + state, 0, 28);

g.drawString("Value b: " + bNum, 0, 45);

g.drawString("b power 2: " + d, 0, 62);

}

}

. 11.5.

, getParameter() null.

javax.swing, Java . - JButton, JCheckBox, JDialog, JMenu, JComboBox, JMenu, JTextField, JTextArea . , , ( Container), . getContentPane().

// # 6: : MyJApplet.java

package chapt11;

import java.awt.Container;

import javax.swing.JApplet;

import javax.swing.JLabel;

 

public class MyJApplet extends JApplet {

private JLabel lbl = new JLabel("Swing-applet!");

 

public void init() {

Container c = getContentPane();

c.add(lbl);

}

}

. 11.6.

JLabel . JLabel String . init() . add() Container, . add() , AWT. Swing , " " ContentPane, getContentPane() JApplet , add().

// # 7: : DemoLC.java

package chapt11;

import java.awt.Color;

import java.awt.Graphics;

import javax.swing.JApplet;

 

public class DemoLC extends JApplet {

private int starX[] =

{ 112, 87, 6, 71, 47, 112, 176, 151, 215, 136 };

 

private int starY[] =

{ 0, 76, 76, 124, 200, 152, 200, 124, 76, 76 };

 

private int i;

private Color c;

 

public void init() {

c = new Color(0, 0, 255);

setBackground(Color.LIGHT_GRAY);

i = 1;

}

public void start() {

int j = i * 25;

if (j < 255)

c = new Color(j, j, 255 - j);

else i = 1;

}

public void paint(Graphics g) {

g.setColor(c);

g.fillPolygon(starX, starY, starX.length);

g.setColor(Color.BLACK);

g.drawPolygon(starX, starY, starX.length);

}

public void stop() {

i++;

}

}

. 11.7.

, , . getAvailableFontFamilyNames() GraphicsEnvironment. , , .

// # 8: : Fonts.java

package chapt11;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.GraphicsEnvironment;

import javax.swing.JApplet;

 

public class Fonts extends JApplet {

private String[] fonts;

 

public void init() {

GraphicsEnvironment ge =

GraphicsEnvironment.getLocalGraphicsEnvironment();

 

fonts = ge.getAvailableFontFamilyNames();

setSize(700, 400);

}

public void paint(Graphics g) {

int xSize = getWidth() / 170;

for (int i = 0; i < fonts.length; i++) {

g.setFont(new Font(

fonts[i], Font.PLAIN, 12)); // , ,

g.drawString(fonts[i],

170 * (i % xSize), 13 * (i / xSize + 1));

}

}

}

. 11.8.

Java ( ) . , java.awt.Frame jawax.swing.JFrame, . Frame JFrame, GUI (Graphics User Interface). Frame Component, Container Window. JFrame Swing Frame.

main() Frame JFrame.

/* # 9: : FrameDemo.java */

package chapt11;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Graphics;

import javax.swing.JFrame;

public class FrameDemo extends JFrame {

private String msg = "My Windows-Application";

 

public void paint(Graphics g) {

int diam = 230;

drawSphere(g, diam);

g.drawString(msg, 59, diam + 52);

g.drawLine(59, diam + 56, 190, diam + 56);

}

public void drawSphere(Graphics g, int diam) {

int r = diam / 2;

int alpha = 0;

int k = 20;

for (int i = 0; i < 4; i++) {

int width = (int) (r * Math.cos(Math.PI / 180 * alpha));

int height = (int) (r * Math.sin(Math.PI / 180 * alpha));

g.setColor(Color.MAGENTA);

g.drawArc(10 + r - width, r + height + i * 10,

2 * width, 80 - i * 20, 0, 180);

g.drawArc(10 + r - width, r - height + i * 10,

2 * width, 80 - i * 20, 0, 180);

g.setColor(Color.BLACK);

g.drawArc(10 + r - width, r + height + i * 10,

2 * width, 80 - i * 20, 0, -180);

g.drawArc(10 + r - width, r - height + i * 10,

2 * width, 80 - i * 20, 0, -180);

alpha += k;

k -= 1;

}

for (int i = 0; i < 4; i++) {

k = (i * i * 17);

g.drawOval(10 + k / 2, 40, diam - k, diam);

}

}

public static void main(String[] args) {

FrameDemo fr = new FrameDemo();

fr.setBackground(Color.LIGHT_GRAY);

// . !

fr.setSize(new Dimension(250, 300));

//

fr.setTitle("Windows-Application");

// . !

fr.setVisible(true);

// - paint()

fr.repaint();

}

}

. 11.9.

main() repaint(). , .

11

.

1. Point Line. n Point. Line , Point . Line Point.

2. Point Line. n Point , .

3. Triangle Point. n Point, , , , .

4. Rectangle Point. n Point. , , , .

5. AnyFigure . , , .

6. Line , A(x1, y1) B(x2, y2). Line. , , , . .

7. Triangle NAngle. ,
m- n- :

.

8. ( ) . .

9. , . .

10. , .

11. , . .

12. () ,
. .

13. () ,
, .

14. , .

15. , .

16. , .

11

11.1.

:

<applet code=MyApplet.class width=200 height=200>

<param name=count value=5>

</applet>

count i?

1) int i = new
Integer(getParameter("count")).intValue();

2) int i = getIntParameter("count");

3) int i = getParameter("count");

4) int i = new Integer(

getIntParameter("count")).intValue();

5) int i = new Integer(getParameter("count"));.

11.2.

show() . , ?

1) setbgcolor();

2) draw();

3) start();

4) repaint();

5) setColor().

11.3.

Container?

1) Window;

2) List;

3) Choice;

4) Component;

5) Panel;

6) Applet;

7) MenuComponent.

11.4.

Container add()? ( )

1) Button;

2) CheckboxMenuItem;

3) Menu;

4) Canvas.

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