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1 13 Java 13.9 Applet AppletContext 13.11

2 Applet java.lang.object java.awt.component java.awt.container java.awt.panel java.applet.applet

3 Applet (1/2) Component GUI etc Container

4 Applet (2/2) Panel Component Applet Panel init(),start(),stop(),destroy(),

5 Component

6 Applet

7 Applet import java.applet.*; import java.awt.*; /*<applet code= BackgroundFore ground width=200 height=200> </applet>*/ public class BackgroundForeground extends Applet { public void paint(graphics g) { } setbackground(color.yello w); setforegroung(color.blue); g.drawline(0,0,200,200); g.fillrect(100,40,50,50); }

8 yellow blue

9 HTML (1/2) /*<applet code= AppletParameters width=300 height=300> <param name= background value= 0xffffff > <param name= foreground balue= 0x000000> <param name= message value= Testing Applet Prameters > </applet>*/

10 HTML (2/2) public class AppletParameters extends Applet{ public void paint(graphics g){ String background = getparameter( background ); String foreground = getparameter( foreground ); String message = getparameter( message ); setbackground(color.decode(background)); setforeground(color.decode(foreground)); Font font = getfont(); FontMetrics fm = getfontmetrics(font); Dimension d = getsize(); int x = (d.width fm.stringwidth(message)) / 2; int y = d.height / 2; g.drawstring(message, x, y);}}

11 AppletContext (1/2) java.applet.appletcontext Web

12 AppletContext (2/2)

13 showdocument showdocument(url url, String target) url: Web target: Web target _self _parent _top _blank

14 URL <frameset> Web 2 <frameset cols= 25%,75% > <frame name= left src= left.html > <frame name= right src= right.html > </frameset>

15 showdocument (1/4) Web showdocument() URL Web ShowDocument.html 4

16 showdocument (2/4) ShowDocument.html <frameset rows= 50%,50%> <frame name= frame1 src= frame1.html > <frame name= frame2 src= frame2.html > </frameset>

17 showdocument (3/4) frame1.html <applet code= ShowDocument width=200 height=50> </applet> frame2.html <B>This is frame2.html</b>

18 showdocument (4/4) import java.applet.*; import java.awt.*; import java.net.*; /*<applet code= ShowDocument widt h=200 height=50> </applet>*/ public class ShowDocument extends Applet{ public void init(){ AppletContext ac = getappletcontext(); } try{ URL url = new URL( ac.showdocument(url, frame2 ); } catch(exception e){ showstatus( Exception: +e); } public void paint(graphics g){ g.drawstring( ShowDocument Applet, 10,25); }}

19 getimage Image getimage(url url) Image getimage(url base, String filename) url: URL base: URL filename:

20 drawimage abstract boolean drawimage (Image img, int x, int y, ImageObserver io) img:getimage() Image x y: io:imageobserver

21 import java.applet.*; import java.awt.*; /*<applet code= DrawImage width=280 height=280> <param name= file value= kids2.jpg > </applet> public class DrawImage extends Applet{ Image image; public void init(){ image = getimage(getdocumentbas e(),getparameter( file )); } public void paint (Graphics g){ } g.drawimage(image, 0, 0, this); }

22 1 (cyan) (red) 2 html

23 2 Web 2

Microsoft PowerPoint ppt

Microsoft PowerPoint ppt 独習 Java 第 3 版 13.9 Applet クラス 13.10 AppletContext インターフェイス 13.11 イメージの使用 Applet クラス右の図は Applet クラスのスーパークラスの継承関係を示す上の 4 つのクラスから Applet クラスに状態と動作が継承される java.lang.object Java.awt.Component java.awt.container