我的程序 现在是在不能在textarea1里调用 GetAnswer() 里面的result的值 ,可能是 GetAnswer() 这个函数错了 ,但是他是从mathematica里面直接粘的例子.能不能帮我把这里面的语句调能跟VJ适用.再三感谢啊
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import com.wolfram.jlink.*;
import com.*;
import java .math .*;
import java.text.*;
import java.awt.Graphics.*;
/**
* This class reads PARAM tags from its HTML host page and sets
* the color and label properties of the applet. Program execution
* begins with the init() method.
*/
public class Applet1 extends Applet implements ActionListener,ItemListener
{
/**
* The entry point for the applet.
*/
public void init()
{
initForm();
usePageParams();
// TODO: Add any constructor code after initForm call.
}
private final String labelParam = "label";
private final String backgroundParam = "background";
private final String foregroundParam = "foreground";
/**
* Reads parameters from the applet's HTML host and sets applet
* properties.
*/
private void usePageParams()
{
final String defaultLabel = "Default label";
final String defaultBackground = "C0C0C0";
final String defaultForeground = "000000";
String labelValue;
String backgroundValue;
String foregroundValue;
/**
* Read the <PARAM NAME="label" VALUE="some string">,
* <PARAM NAME="background" VALUE="rrggbb">,
* and <PARAM NAME="foreground" VALUE="rrggbb"> tags from
* the applet's HTML host.
*/
labelValue = getParameter(labelParam);
backgroundValue = getParameter(backgroundParam);
foregroundValue = getParameter(foregroundParam);
if ((labelValue == null) || (backgroundValue == null) ||
(foregroundValue == null))
{
/**
* There was something wrong with the HTML host tags.
* Generate default values.
*/
labelValue = defaultLabel;
backgroundValue = defaultBackground;
foregroundValue = defaultForeground;
}
/**
* Set the applet's string label, background color, and
* foreground colors.
*/
label1.setText(labelValue);
label1.setBackground(stringToColor(backgroundValue));
label1.setForeground(stringToColor(foregroundValue));
this.setBackground(stringToColor(backgroundValue));
this.setForeground(stringToColor(foregroundValue));
}
/**
* Converts a string formatted as "rrggbb" to an awt.Color object
*/
private Color stringToColor(String paramValue)
{
int red;
int green;
int blue;
red = (Integer.decode("0x" + paramValue.substring(0,2))).intValue();
green = (Integer.decode("0x" + paramValue.substring(2,4))).intValue();
blue = (Integer.decode("0x" + paramValue.substring(4,6))).intValue();
return new Color(red,green,blue);
}
/**
* External interface used by design tools to show properties of an applet.
*/
public String[][] getParameterInfo()
{
String[][] info =
{
{ labelParam, "String", "Label string to be displayed" },
{ backgroundParam, "String", "Background color, format \"rrggbb\"" },
{ foregroundParam, "String", "Foreground color, format \"rrggbb\"" },
};
return info;
}
String name;
Label label1 = new Label();
Label label2=new Label();
TextArea textarea=new TextArea(" ",5,10,TextArea.SCROLLBARS_HORIZONTAL_ONLY);
//TextField text2=new TextField(" ");
TextArea textarea1=new TextArea(" ",5,10,TextArea.SCROLLBARS_HORIZONTAL_ONLY);
Button button1=new Button("计算");
double result;
public void itemStateChanged(ItemEvent e)
{
name=(String)e.getItem();
}
public void actionPerformed(ActionEvent e)
{
if(e.getActionCommand()=="计算")
{textarea1.setText("result");//输出
//GetAnswer();
//text2.setText("rr=" + result);
//textarea1.setText("result");//输出
this.repaint();
}
}
/**
* Intializes values for the applet and its components
*/
void initForm()
{
this.setBackground(Color.lightGray);
this.setForeground(Color.black);
label1.setText("label1");
this.setLayout(new FlowLayout());
this.add(label2);
label2.setText("算式为");
this.add(textarea);
button1.addActionListener(this);//将小程序注册为button1的动作事件监听者
this.add(button1);
this.add(textarea1);
}
//private void GetAnswer(String[] argv)
private static void GetAnswer()
{
KernelLink ml = null;
try {
//ml = MathLinkFactory.createKernelLink(argv);
ml = MathLinkFactory.createKernelLink("-linkmode launch -linkname 'c:/program files/wolfram research/mathematica/5.0/mathkernel.exe'");
}
catch (MathLinkException e)
{
return;
}
try
{
// Get rid of the initial InputNamePacket the kernel will send
// when it is launched.
ml.discardAnswer();
ml.evaluate("<<MyPackage.m");
ml.discardAnswer();
ml.evaluate("2+2");
ml.waitForAnswer();
double result;
//result = 0.0;
result= ml.getInteger();
//System.out.println("2 + 2 = " + result);
/* ml.evaluate("NIntegrate[Sin[x],{x,0,1}]");
ml.waitForAnswer();
double result2=ml.getDouble();
//System.out.println("integrate sin(x) = " + result2);
// Here抯 how to send the same input, but not as a string:
ml.putFunction("EvaluatePacket", 1);
ml.putFunction("Plus", 2);
ml.put(3);
ml.put(3);
ml.endPacket();
ml.waitForAnswer();
result = ml.getInteger();
//System.out.println("3 + 3 = " + result);
// If you want the result back as a string, use evaluateToInputForm or
// evaluateToOutputForm. The second arg for either is the requested page
// width for formatting the string. Pass 0 for PageWidth->Infinity.
// These methods get the result in one step--no need to call waitForAnswer.
String strResult = ml.evaluateToOutputForm("4+4", 0);*/
//System.out.println("4 + 4 = " + strResult);
}
catch (MathLinkException e)
{
System.out.println("MathLinkException occurred: " + e.getMessage());
}
finally
{
ml.close();
}
}
} |
发表于 2008-4-27 09:37
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