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Topic: Internal compiler error: java.lang.ArrayIndexOutOfBoundsException: 0.

1.Internal compiler error: java.lang.ArrayIndexOutOfBoundsException: 0.

Posted by: xiaoshitou
Posted on: 2005-05-11 17:16

package src.classifiers.trees;

import src.classifiers.trees.m5.*;
import java.io.*;
import java.util.*;
import src.core.*;

/**
* M5P. Implements routines for generating M5 model trees.
*
* Valid options are:
*
* -U 
* Use unsmoothed predictions. 
*
* @author <a href="mailto:mhall@cs.waikato.ac.nz">Mark Hall</a>
* @version $Revision: 1.1 $
*/

public class M5P extends M5Base
implements Drawable {

/**
* Creates a new <code>M5P</code> instance.
*/
public M5P() {
super();
setGenerateRules(false);
}

/**
* Returns the type of graph this classifier
* represents.
* @return Drawable.TREE
*/
public int graphType() {
return Drawable.TREE;
}

/**
* Return a dot style String describing the tree.
*
* @return a <code>String</code> value
* @exception Exception if an error occurs
*/
public String graph() throws Exception {
StringBuffer text = new StringBuffer();

text.append("digraph M5Tree {\n");
Rule temp = (Rule)m_ruleSet.elementAt(0);
temp.topOfTree().graph(text);
text.append("}\n");
return text.toString();
}

/**
* Set whether to save instance data at each node in the
* tree for visualization purposes
*
* @param save a <code>boolean</code> value
*/
public void setSaveInstances(boolean save) {
m_saveInstances = save;
}

/**
* Get whether instance data is being save.
*
* @return a <code>boolean</code> value
*/
public boolean getSaveInstances() {
return m_saveInstances;
}

/**
* Returns an enumeration describing the available options
*
* @return an enumeration of all the available options
*/
public Enumeration listOptions() {
Enumeration superOpts = super.listOptions();

Vector newVector = new Vector();
while (superOpts.hasMoreElements()) {
newVector.addElement((Option)superOpts.nextElement());
}

newVector.addElement(new Option("\tSave instances at the nodes in\n"
 +"\tthe tree (for visualization purposes)\n",
 "L", 0, "-L"));
return newVector.elements();
}

/**
* Parses a given list of options. 
*
* Valid options are:
*
* -U 
* Use unsmoothed predictions. 
*
* -R 
* Build a regression tree rather than a model tree. 
*
* -L 
* Save instance data at each node (for visualization purposes). 
*
* @param options the list of options as an array of strings
* @exception Exception if an option is not supported
*/
public void setOptions(String[] options) throws Exception {
setSaveInstances(Utils.getFlag('L', options));
super.setOptions(options);
}

/**
* Gets the current settings of the classifier.
*
* @return an array of strings suitable for passing to setOptions
*/
public String [] getOptions() {
String[] superOpts = super.getOptions();
String [] options = new String [superOpts.length+1];
int current = superOpts.length;
for (int i = 0; i < current; i++) {
options[i] = superOpts[i];
}

if (getSaveInstances()) {
options[current++] = "-L";
}

while (current < options.length) {
options[current++] = "";
}

return options;
}

/**
* Main method by which this class can be tested
*
* @param args an array of options
*/
public static void main(String[] args) {
try {
System.out.println(src.classifiers.Evaluation.evaluateModel(
 new M5P(),
 args));
} catch (Exception e) {
System.err.println(e.getMessage());
e.printStackTrace();
}
}
}

大家帮忙看看，怎么会出现Internal compiler error: java.lang.ArrayIndexOutOfBoundsException: 0.
问题

2.Re:Internal compiler error: java.lang.ArrayIndexOutOfBoundsException: 0. [Re: xiaoshitou]	Copy to clipboard
Posted by: uniquejava Posted on: 2005-05-11 18:50 import src.classifiers.trees.m5.; import src.core.; 没有这两个包，大家怎么给你看啊你是不是在研究Weka？对这个我不太懂，你的错误是数组下标越界，我是看不出来的，呵呵

3.Re:Internal compiler error: java.lang.ArrayIndexOutOfBoundsException: 0. [Re: xiaoshitou]	Copy to clipboard
Posted by: xiaoshitou Posted on: 2005-05-11 19:11 这的确是weka的一个程序是不是导入的这些包里面有数组下标越界问题出现的话，也会导致出现这样的错误。我也觉得好像单单从这个程序里面发现不了什么数字下标越界啊谢谢你了，楼上的

4.Re:Internal compiler error: java.lang.ArrayIndexOutOfBoundsException: 0. [Re: xiaoshitou]

Copy to clipboard

Posted by: xiaoshitou
Posted on: 2005-05-11 20:14

能不能帮我看看这个程序，也是 “数组下标越界 ”错误。
该程序所导入的包我已经测试过了，都没有问题的
package src.gui.boundaryvisualizer;

import src.core.*;

public interface DataGenerator {

void buildGenerator(Instances inputInstances) throws Exception;

double [][] generateInstances(int [] indices) throws Exception;

double [] getWeights() throws Exception;

void setWeightingDimensions(boolean [] dimensions);

void setWeightingValues(double [] vals);

int getNumGeneratingModels();

void setSeed(int seed);
}