刚好学java
测试applet出现了问题
问题如下以及相关信息描述如下：
源代码如下
-------- theApplet.html------------
<html>
<applet code ="AdditionApplet.class" width=300 height=50>
</applet>
</html>
---------AdditionApplet.java-------------
import javax.swing.*;
import java.awt.Graphics;
public class AdditionApplet
{
double sum;
public void init()
{
String firstNumber,
secondNumber;
double number1,
number2;
//input two numbers
firstNumber=
JOptionPane.showInputDialog(
"Enter the first floating-point value");
secondNumber=
JOptionPane.showInputDialog(
"Enter the second floating-point value");
number1=Double.parseDouble(firstNumber);
number2=Double.parseDouble(secondNumber);
//add the numbers
sum= number1+ number2;
}
public void paint (Graphics g )
{
//output the result
g.drawRect(15,10,270,20) ;
g.drawString("the sum is "+sum ,25,25);
}
}
以上两个文件在同一目录下面
进入dos命令行，并进入相应目录
> javac AdditionApplet.java
> appletviewer theApplet.html
出现如下的错误
java.lang.ClassCastException
at sun.applet.AppletPanel.createApplet(AppletPanel.java:617)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:546)
at sun.applet.AppletPanel.run(AppletPanel.java:298)
at java.lang.Thread.run(Thread.java:534)
使用的是win2k advance server 系统
jdk 用的是Java[TM] 2 Platform, Enterprise Edition 1.4 SDK 中的那个
环境变量
java_home D:\Sun\AppServer\jdk
classpath .\;%JAVA_HOME%\lib\tools.jar
path %JAVA_HOME%\bin(系统其他的就没写在这了)
请各位高手指点，感激不尽
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.text:''):(d.getSelection?d.getSelection():'');void(keyit=window.open('http://my.poco.cn/fav/storeIt.php?t='+escape(d.title)+'&u='+escape(d.location.href)+'&c='+escape(t)+'&img=http://www.h-strong.com/blog/logo.gif','keyit','scrollbars=no,width=475,height=575,status=no,resizable=yes'));keyit.focus();){kind=logo}
