| 发表于：2007-07-11 02:16:26 楼主 |
源程序如下:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class comcountry extends jframe implements itemlistener
{
private string[] flagtitle = { "canada ", "china ", "denmark ",
"france ", "germany ", "india ", "norway ", "united kingdom ",
"united states of america "};
private imageicon flagimage[]= new imageicon[9];
private string flagdescription[]=new string[9];
private jcombobox countrynamecombobox=new jcombobox（);
private descriptionpanel descriptionpanel=new descriptionpanel（);
public comcountry（)
{
flagimage[0] = new imageicon（ "images/ca.gif ");
flagimage[1] = new imageicon（ "images/china.gif ");
flagimage[2] = new imageicon（ "images/denmark.gif ");
flagimage[3] = new imageicon（ "images/fr.gif ");
flagimage[4] = new imageicon（ "images/germany.gif ");
flagimage[5] = new imageicon（ "images/india.gif ");
flagimage[6] = new imageicon（ "images/norway.gif ");
flagimage[7] = new imageicon（ "images/uk.gif ");
flagimage[8] = new imageicon（ "images/us.gif ");
// set text description
flagdescription[0] = "the maple leaf flag \n\n " +
"the canadian national flag was adopted by the canadian " +
"parliament on october 22, 1964 and was proclaimed into law " +
"by her majesty queen elizabeth ii （the queen of canada) on " +
"february 15, 1965. the canadian flag （colloquially known " +
"as the maple leaf flag) is a red flag of the proportions " +
"two by length and one by width, containing in its centre a " +
"white square, with a single red stylized eleven-point " +
"mapleleaf centred in the white square. ";
flagdescription[1] = "description for china ... ";
flagdescription[2] = "description for denmark ... ";
flagdescription[3] = "description for france ... ";
flagdescription[4] = "description for germany ... ";
flagdescription[5] = "description for india ... ";
flagdescription[6] = "description for norway ... ";
flagdescription[7] = "description for uk ... ";
flagdescription[8] = "description for us ... ";
jlabel titlelabel=new jlabel（ "qzm 's first program ");
jpanel p1=new jpanel（);
p1.setlayout（new borderlayout（));
p1.add（titlelabel,borderlayout.center);
p1.add（countrynamecombobox,borderlayout.west);
getcontentpane（).setlayout（new borderlayout（));
getcontentpane（).add（p1,borderlayout.north);
getcontentpane（).add（descriptionpanel,borderlayout.center);
countrynamecombobox.additemlistener（this);
}
public static void main（string [] args)
{
// descriptionpanel frame1=new descriptionpanel（);
comcountry frame1=new comcountry（);
frame1.setvisible（true);
frame1.pack（);
frame1.setdefaultcloseoperation（jframe.exit_on_close);
}
public void itemstatechanged（itemevent e)
{
displaydescriptionpanel（countrynamecombobox.getselectedindex（));
}
public void displaydescriptionpanel（int index)
{
descriptionpanel.setimage（flagimage[index]);
descriptionpanel.settitle（flagtitle[index]);
descriptionpanel.settext（flagdescription[index]);
}
}
class descriptionpanel extends jframe
{
private jtextarea textarea1=new jtextarea（);
private jlabel countryimagelabel=new jlabel（);
private jlabel countrytitlelabel=new jlabel（);
public descriptionpanel（)
{
jpanel p1=new jpanel（);
p1.setlayout（new borderlayout（));
p1.add（countryimagelabel,borderlayout.center);
p1.add（countryimagelabel,borderlayout.south);
jscrollpane jscrollpane=new jscrollpane（);
jscrollpane.add（textarea1);
textarea1.setlinewrap（true);
textarea1.setwrapstyleword（true);
setlayout（new borderlayout（));
add（jscrollpane,borderlayout.east);
add（p1,borderlayout.center);
}
public void setimage（imageicon icon)
{
countryimagelabel.seticon（icon);
dimension dimension=new dimension（icon.geticonwidth（),icon.geticonheight（));
countryimagelabel.setpreferredsize（dimension);
}
public void settitle（string title)
{
countrytitlelabel.settext（title);
}
public void settext（string text)
{
textarea1.settext（text);
}
}
编译 ok
运行出现如下错误。
exception in thread "main " java.lang.illegalargumentexception: adding a window to a container
at java.awt.container.addimpl（container.java:1022)
at java.awt.container.add（container.java:903)
at comcountry. <init> （comcountry.java:55)
at comcountry.main（comcountry.java:62)
本人系java初学者，望高手指点。不甚感激。 |
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