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Subject:
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Class Can't be instantiated
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Posted By:
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enderjs
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Post Date:
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9/29/2004 10:01:02 AM
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Hello I have been working on this program, that parses an XML document and then displays the information in an applet. It keeps giving me the error:
java.lang.InstantiationException: DOMApplet
at java.lang.Class.newInstance0(Class.java:293)
at java.lang.Class.newInstance(Class.java:261)
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)
load: DOMApplet.class can't be instantiated.
I looked it up and i think that it is because i have an abstract class. I have no idea how to fix it, if any one could help i would appreciate it. Here is the code that i have been working on. I have not finished the display part yet because i want to get it to parse the document first.
import javax.xml.parsers.*;
import org.w3c.dom.*;
import java.io.*;
import java.applet.Applet;
import java.awt.Graphics;
public class DOMApplet extends java.applet.Applet {
StringBuffer buffer;
/** Initialization method that will be called after the applet is loaded
* into the browser.
*/
public void init() {
}
public void start() {
try {
//tells the program to create an new parser and parse the document
DOMApplet da = new DOMApplet("C:\\Documents and Settings\\jason.silvers\\My Documents\\DOMTest3\\Newproductlist2.xml");
}
catch (Exception ex) {
System.out.println (ex.getMessage());
}
}
public DOMApplet(String uri) {
try {
//builds the factory to parse the file
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setValidating(false);
DocumentBuilder builder = factory.newDocumentBuilder();
//the file is parsed and saved to memory
Document doc = builder.parse(uri);
//retrives the document and gets it ready to be displayed
displayTree(doc.getDocumentElement());
// System.out.println(doc.getDocumentElement());
}
catch (Exception ex) {
System.out.println (ex.getMessage());
}
}
public void displayTree(Node node) {
short nodeType = node.getNodeType();
switch (nodeType) {
case Node.ELEMENT_NODE:
printElement((Element)node);
break;
case Node.ATTRIBUTE_NODE:
printElement((Element)node);
break;
case Node.TEXT_NODE:
printText((Text)node);
default:
}
}
protected void printElement(Element node) {
//code to format elements for display
}
protected void printText(CharacterData node) {
//code to display XML
}
}
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