???? Applet?????

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???? Applet?????

• ??? Java Applet??

2
??

• Date?
• SimpleDateFormat?
• Math??????
• AWT?
• Frame
• Panel
• Button

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GUI????
?AWT????,?????????????????GUI??(Component)????
???????????? 1?????,?????????????,???????????????
???????????????????? 2???????????????,??????(conta
iner)????????????????,??????????????,?????????????
? 3?AWT????????Frame??Dia1og??Panel????AWT??????
,Applet???????,??Panel???????
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AWT ??????
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?????????

• ????????,AWT????????
• ??????Object???,?????Component
• ????????Component??,??????Container
• ????Container??,???????????
• ?????????,??????????????????(???????)
• ????????????????Container?????(JavaAPI)
• add()??
• remove()??
• setLayout()??

6
??

• Applet????????
• ??????????
• Applet??????????
• Html??
• ????

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Applet????????

• Java????
• ????????main??,??JVM????
• ?????
• ????????????????,??????main???
• ??????????????
• import java.applet.
• public class MyApplet extends Applet
• ???????????????,??public,???Applet????
• ????????
• ?????????????????
• ??html??,??ltappletgt ????????????
• ??????html?????appletviewer???????

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????
import java.applet.Applet import
java.awt. public class Test extends
Applet public void paint(Graphics
g) g.drawOval(10,10,100,100)
lt!-- test.html??--gt ltapplet codeTest.class
height120 width400gtlt/appletgt
???????Graphics,????Java????????Graphics????,????
??paint()????g???????????
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Applet??????????
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import java.applet. import java.awt. public
class MyApple extends Applet Button b1,b2 int
sum public void init() b1new
Button("??") b2new Button("??") add(b1)add
(b2) public void start() sum0 for
(int i 1 ilt100 i) sumi public
void paint(Graphics g) g.setColor(Color.blue)
g.drawString("??????",20,60) g.setColor(
Color.red) g.drawString("sum"sum,20,100)

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???9.1
1???????sum 2?????fillOval()?drawOval() 3????
?????new Color(r,g,b) 4???????Math.radom()
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Html??

• ????
• ltapplet codeTest height120 width400gtlt/appletgt
• ltApplet ??gt
• Code????????,?????,?????html?????????
• Height?width??applet???????

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????
lt!-- test.html??????--gt ltapplet codeTest2.class
height400 width500 gt ltparam name"gao"
value"400"gt ltparam name"kuan"
value"500"gt lt/appletgt
//???? int width0,height0 String
para paragetParameter("gao") if(para!null)
height Integer.parseInt(para) paragetParam
eter("kuan") if(para!null) widthInteger.parseI
nt(para)
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????
import java.applet. import java.awt. public
class MyApple extends Applet public void
paint(Graphics g) int r,gr,b,h300,w400 i
nt x,y,x1,y1 for (int i 0 ilt100
i) r(int)(Math.random()255) gr(int
)(Math.random()255) b(int)(Math.random()255
) g.setColor(new Color(r,gr,b)) x(int)(Ma
th.random()w) y(int)(Math.random()h) x1
(int)(Math.random()105) y1x1 g.fillOva
l(x,y,x1,y1)
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??????

• ??
• ??AWT???????
• ???????
• ??Applet??????????
• ??Applet????????
• ?????
• 1?????GUI????,???(Frame??,?????)???????(Panel??,??
  ???),?????????(button1?button2),??????400,?300?
• 2?????Applet???,?????????????
• 3???????????,???????????