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Thread: Matrix Generator

  1. #1
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    Default Matrix Generator

    Hi,

    Im having some problems with my code (In bold). Please can someone look into it.

    import java.util.Arrays;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.Random;
    import java.util.StringTokenizer;

    public class MatrixGenerator {
    private Map<String, String> lexicon;
    private Map<String, Integer> freq;
    private String corpus;
    private double[][] result;
    private String tagset;
    public MatrixGenerator(Map<String, String> lexicon, String corpus, String tagset) {
    this.corpus = corpus;
    this.lexicon = lexicon;
    this.tagset = tagset;
    countLexems();
    System.out.println("Tagset: " + tagset);
    System.out.println();
    System.out.println("Corpus: " + corpus);
    System.out.println();
    System.out.println("Frequencies:");
    System.out.println();
    printMap(freq);
    }
    public double[][] createMatrixB() {
    String[] t = tagset.split(" ");
    String[] l = lexicon.keySet().toArray(new String[0]);


    result = new double[l.length][t.length];
    for (int j = 0; j < result.length; j++) {
    Arrays.fill(result[j], 0.0);
    for (int k = 0; k < result[j].length; k++) {
    String categories = lexicon.get(l[j]);
    if (categories.contains(t[k])) {
    result[j][k] = 1.0 / categories.split(",").length;
    }
    }
    }


    for (int j = 0; j < result.length; j++) {
    for (int k = 0; k < result[j].length; k++) {
    double a = result[j][k] * freq.get(l[j]);
    double b = 0.0;
    for (int index = 0; index < result.length; index++) {
    b += result[index][k] * freq.get(l[index]);
    }
    result[j][k] = a / b;
    }
    }

    System.out.println();
    System.out
    .println("Matrix B (word-tag, lexicon and tags ordered as printed above, learned from corpus):");
    ViterbiMatrixTools.printMatrix(result);
    return result;
    }

    public double[][] createMatrixA(double diff) {
    String[] t = tagset.split(" ");
    double[][] res = new double[t.length][t.length];
    int cols = res[0].length;
    double average = 1.0 / cols;
    for (int i = 0; i < res.length; i++) {
    Arrays.fill(res[i], average);
    }
    Random r = new Random();
    for (int i = 0; i < res.length; i++) {
    double var = 1.0;
    while (var > diff)
    var = r.nextDouble();
    int pos = r.nextInt(res[i].length);
    boolean plus = true;
    for (int j = 0; j < res[i].length; j++) {
    // if not even, skip one random position

    if (res[i].length % 2 != 0 && j == pos)
    continue;
    if (plus && res[i][j] - var > 0) {
    res[i][j] += var;
    plus = false;
    } else if (res[i][j] - var > 0) {
    res[i][j] -= var;
    plus = true;
    }
    }
    }
    System.out.println();
    System.out.println("Matrix A (tag-tag, pseudo-random-generated):");
    ViterbiMatrixTools.printMatrix(res);
    System.out.println();
    return res;
    }


    private void printMap(Map<String, ?> map) {
    for (Map<String, ?> e : map.entrySet()) {
    System.out.println(e.getKey() + ": " + e.getValue());
    }
    }



    private void countLexems() {
    freq = new HashMap<String, Integer>();
    for (StringTokenizer tok = new StringTokenizer(corpus, " \t\n.,", true);
    tok.hasMoreTokens(); ) {
    String rec = tok.nextToken();
    if (lexicon.containsKey(rec)) {
    if (freq.containsKey(rec)) {
    freq.put(rec, freq.get(rec) + 1);
    } else {
    freq.put(rec, 1);
    }
    }
    }
    }

    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Matrix Generator

    Please post the full text of the error messages.
    Or explain what the problem is.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Matrix Generator

    I am trying to do POS tagger in Java( Part of speech). The program has 5 classes- Tagger, Abstract HMM, Matrix Generator, Viterbi HMM and Viterbi Matrix Tools. HMM is Hidden Markov Model and is implemented using the Viterbi algo. All the other classes are working fine except for the Matrix Generator. The code(in bold) shows error "incompatible types" and "cannot find symbol getKey() and getValue().

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Matrix Generator

    error "incompatible types" and "cannot find symbol getKey() and getValue().
    The compiler sees that the variables are incompatible types.
    It can not find the methods: getKey and getValue in the class: Map.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: Matrix Generator

    Quote Originally Posted by Norm View Post
    The compiler sees that the variables are incompatible types.
    It can not find the methods: getKey and getValue in the class: Map.

    So how do I go about it??

  6. #6
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    Default Re: Matrix Generator

    I would suggest reading The Map Javadoc and find methods which do what you're looking for, or if none exist, figure out a way to use the available Map interface methods combined with logic to achieve that behavior.

  7. #7
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    Default Re: Matrix Generator

    hi...thank you so much...i finally managed to solve it. But now im having problem with my tagger.. could you please look into it. The output should say whether a word is noun, verb or verb noun. I can build it but i cant run and see the output. Btw i am using Netbeans

    import java.util.HashMap;
    import java.util.Map;
    import org.junit.Test;

    public class Tagger {
    String tagset;
    String corpus;
    Map<String, String> lexicon;
    String lexiconString;
    @Test
    public void testTagger() {

    System.out.println(tag("layers that fly that food . that fly sneaks ."));
    }

    private void initData() {
    lexicon = new HashMap<String, String>();
    lexicon.put("fly", "vn");
    lexicon.put("layers", "vn");
    lexicon.put("sneaks", "v");
    lexicon.put("food", "n");
    lexicon.put("that", "det,rp");
    lexicon.put(".", "period");
    StringBuilder lexBuf = new StringBuilder();
    for (String word : lexicon.keySet()) {
    StringBuilder append = lexBuf.append(word).append(" ");
    }
    lexiconString = lexBuf.toString();
    tagset = "det rp vn v n period";
    corpus = "that fly layers. that fly sneaks. that, that sneaks food" +
    "layers. that fly layers that food. layers.";
    }


    public String tag(String input) {
    initData();
    ViterbiHMM hmm = new ViterbiHMM(tagset, lexiconString, input, lexicon,
    corpus, true);
    String[] in = input.split(" ");
    String[] re = hmm.mostProbableSequence().split(" ");
    StringBuilder buf = new StringBuilder();
    for (int i = 0; i < in.length; i++) {
    StringBuilder append = buf.append(in[i]).append(":").append(re[i]).append(" ");
    }
    return buf.toString();
    }
    }

  8. #8
    Super Moderator Norm's Avatar
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    Default Re: Matrix Generator

    What happens when you try to execute the program? I don't see a main() method.
    If you don't understand my answer, don't ignore it, ask a question.

  9. #9
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    Default Re: Matrix Generator

    i cant execute the program...i can just build it.. The thing is whenever i try to put in a main method it shows error but when i don't there is none. What can i do?? I really don't know what is wrong..

  10. #10
    Super Moderator Norm's Avatar
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    Default Re: Matrix Generator

    To execute a class using the java command, the class must have a correct main() method.
    it shows error
    Please post the full text of the compiler error message.
    If you don't understand my answer, don't ignore it, ask a question.

  11. #11
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    Default Re: Matrix Generator

    ok...u see if i put in the
    public static void main(String[] args) {
    i have to remove the word "tag" from
    System.out.println(tag("layers that fly that food . that fly sneaks .")); as it says it is not a static method. So when i remove the word "tag" i can compile and run it and the output shows "layers that fly that food . that fly sneaks ." Beside that, i also have to remove the @Test and
    public void testTagger() { to make it work

    When i dont do all that...it is as this (print screen) Untitled.jpg

  12. #12
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    Default Re: Matrix Generator

    ok...u see if i put in the
    public static void main(String[] args) {
    i have to remove the word "tag" from
    System.out.println(tag("layers that fly that food . that fly sneaks .")); as it says it is not a static method. So when i remove the word "tag" i can compile and run it and the output shows "layers that fly that food . that fly sneaks ." Beside that, i also have to remove the @Test and
    public void testTagger() { to make it work

    When i dont do all that...it is as this (print screen) Untitled.jpg

  13. #13
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    Default Re: Matrix Generator

    run:
    Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - non-static method tag(java.lang.String) cannot be referenced from a static context
    at Tagger.main(Tagger.java:12)
    Java Result: 1
    BUILD SUCCESSFUL (total time: 3 seconds)

  14. #14
    Super Moderator Norm's Avatar
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    Default Re: Matrix Generator

    non-static method tag(java.lang.String) cannot be referenced from a static context
    You need to create an instance of the class to be able to call a non-static method in that class.

    Please Edit your post and wrap your code with[code=java]<YOUR CODE HERE>[/code] to get highlighting
    If you don't understand my answer, don't ignore it, ask a question.

  15. #15
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    Default Re: Matrix Generator

    how do i go about creating an instance of the class??

  16. #16
    Super Moderator Norm's Avatar
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    Default Re: Matrix Generator

    ClassWithMethod cwm = new ClassWithMethod(); // create instance of class
    If you don't understand my answer, don't ignore it, ask a question.

  17. #17
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    Default Re: Matrix Generator

    Hi, thank you so much for replaying soon. The code is not having any errors now, but there is no output.

     
    import java.util.HashMap;
    import java.util.Map;
    import org.junit.Test;
     
     
    class Tag{
       String tag;
    }
    class InstanceOf { 
        public static void main(String args[]) { 
            Tag tag = new Tag();
        }
    }
     
     public class Tagger {
     	String tagset;
     	String corpus;
     	Map<String, String> lexicon;
     	String lexiconString;
     	@Test
     	public void testTagger() {
     
     		System.out.println(tag("layers that fly that food . that fly sneaks ."));
     	}
     
     	private void initData() {
     	    lexicon = new HashMap<String, String>();
     	    lexicon.put("fly", "vn");
     	    lexicon.put("layers", "vn");
     	    lexicon.put("sneaks", "v");
     	    lexicon.put("food", "n");
     	    lexicon.put("that", "det,rp");
     	    lexicon.put(".", "period");
     	    StringBuilder lexBuf = new StringBuilder();
     	    for (String word : lexicon.keySet()) {
                StringBuilder append = lexBuf.append(word).append(" ");
     	    }
     	    lexiconString = lexBuf.toString();
     	    tagset = "det rp vn v n period";
     	    corpus = "that fly layers. that fly sneaks. that, that sneaks food" +
     	    		"layers. that fly layers that food. layers.";
     	}
     
     
     	public String tag(String input) {
     	    initData();
     	    ViterbiHMM hmm = new ViterbiHMM(tagset, lexiconString, input, lexicon,
     	            corpus, true);
     	    String[] in = input.split(" ");
     	    String[] re = hmm.mostProbableSequence().split(" ");
     	    StringBuilder buf = new StringBuilder();
     	    for (int i = 0; i < in.length; i++) {
                StringBuilder append = buf.append(in[i]).append(":").append(re[i]).append(" ");
     	    }
     	    return buf.toString();
     	}
    }

  18. #18
    Super Moderator Norm's Avatar
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    Default Re: Matrix Generator

    Where is the execution flow going in the program? Add some println statements to all the methods to print to a message when they are executed. Check that the code is calling the methods that you want it to. If you do not call a method it will not be executed.
    If you don't understand my answer, don't ignore it, ask a question.

  19. #19
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    Default Re: Matrix Generator

    hi..i am still not able to get an output. So im sending all five classes that i have created with the hope u can go thru it and check for any mistakes that i have done. Thank you very much and sorry for all the trouble.

    Tagger.java
    import java.util.HashMap;
    import java.util.Map;
    import org.junit.Test;
     
     
    class Tag{
       String tag;
    }
    class InstanceOf { 
        public static void main(String args[]) { 
            Tag tag = new Tag();
            System.out.print(tag);
        }
    }
     
     public class Tagger {
     	String tagset;
     	String corpus;
     	Map<String, String> lexicon;
     	String lexiconString;
     	@Test
     	public void testTagger() {
     
     		System.out.println(tag("layers that fly that food . that fly sneaks ."));
     	}
     
     	private void initData() {
     	    lexicon = new HashMap<String, String>();
     	    lexicon.put("fly", "vn");
     	    lexicon.put("layers", "vn");
     	    lexicon.put("sneaks", "v");
     	    lexicon.put("food", "n");
     	    lexicon.put("that", "det,rp");
     	    lexicon.put(".", "period");
     	    StringBuilder lexBuf = new StringBuilder();
     	    for (String word : lexicon.keySet()) {
                StringBuilder append = lexBuf.append(word).append(" ");
     	    }
     	    lexiconString = lexBuf.toString();
     	    tagset = "det rp vn v n period";
     	    corpus = "that fly layers. that fly sneaks. that, that sneaks food" +
     	    		"layers. that fly layers that food. layers.";
     	}
     
     
     	public String tag(String input) {
     	    initData();
     	    ViterbiHMM hmm = new ViterbiHMM(tagset, lexiconString, input, lexicon,
     	            corpus, true);
     	    String[] in = input.split(" ");
     	    String[] re = hmm.mostProbableSequence().split(" ");
     	    StringBuilder buf = new StringBuilder();
     	    for (int i = 0; i < in.length; i++) {
                StringBuilder append = buf.append(in[i]).append(":").append(re[i]).append(" ");
     	    }
     	    return buf.toString();
     	}
    }


     AbstractHMM.java 
    import java.util.Map;
     
     abstract class AbstractHMM {
         protected String a;
         protected int n;
         protected String obsA;
         protected String obs;
         protected double[][] A;
         protected double[][] B;
         protected String mostProbableSequence;
         public AbstractHMM(String a, String obsA, String obs,
                 Map<String, String> lexicon, String corpus) {
             MatrixGenerator gen = new MatrixGenerator(lexicon, corpus, a);
             this.a = a;
             this.n = obs.length();
             this.obsA = obsA;
             this.obs = obs;
             this.A = gen.createMatrixA(0.01);
             this.B = gen.createMatrixB();
         }
     
         public abstract String mostProbableSequence();
     }

    MatrixGenerator .java  
    import java.util.Arrays;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.Random;
    import java.util.StringTokenizer;
     
     
      public class MatrixGenerator {
      	private Map<String, String> lexicon;
      	private Map<String, Integer> freq;
      	private String corpus;
      	private double[][] result;
     	private String tagset;
      	public MatrixGenerator(Map<String, String> lexicon, String corpus, String tagset) {
      		this.corpus = corpus;
      		this.lexicon = lexicon;
      		this.tagset = tagset;
      		countLexems();
      		System.out.println("Tagset: " + tagset);
      		System.out.println();
      		System.out.println("Corpus: " + corpus);
      		System.out.println();
      		System.out.println("Frequencies:");
      		System.out.println();
      		printMap(freq);
      	}
      	public double[][] createMatrixB() {
      		String[] t = tagset.split(" ");
      		String[] l = lexicon.keySet().toArray(new String[0]);
     
     
      		result = new double[l.length][t.length];
      		for (int j = 0; j < result.length; j++) {
      		    Arrays.fill(result[j], 0.0);
      		    for (int k = 0; k < result[j].length; k++) {
      		        String categories = lexicon.get(l[j]);
      		        if (categories.contains(t[k])) {
      		            result[j][k] = 1.0 / categories.split(",").length;
      		        }
      		    }
      		}
     
     
      		for (int j = 0; j < result.length; j++) {
      		    for (int k = 0; k < result[j].length; k++) {
      		        double a = result[j][k] * freq.get(l[j]);
      		        double b = 0.0;
      		        for (int index = 0; index < result.length; index++) {
      		            b += result[index][k] * freq.get(l[index]);
      		        }
      		        result[j][k] = a / b;
      		    }
      		}
     
      		System.out.println();
      		System.out
      		        .println("Matrix B (word-tag, lexicon and tags ordered as printed above, learned from corpus):");
      		ViterbiMatrixTools.printMatrix(result);
      		return result;
      	}
     
      	public double[][] createMatrixA(double diff) {
      	    String[] t = tagset.split(" ");
      	    double[][] res = new double[t.length][t.length];
      	    int cols = res[0].length;
      	    double average = 1.0 / cols;
      	    for (int i = 0; i < res.length; i++) {
      	        Arrays.fill(res[i], average);
      	    }
      	    Random r = new Random();
      	    for (int i = 0; i < res.length; i++) {
      	        double var = 1.0;
      	        while (var > diff)
     	            var = r.nextDouble();
     	        int pos = r.nextInt(res[i].length);
     	        boolean plus = true;
     	        for (int j = 0; j < res[i].length; j++) {
     	            // if not even, skip one random position
     
     	            if (res[i].length % 2 != 0 && j == pos)
     	                continue;
     	            if (plus && res[i][j] - var > 0) {
     	                res[i][j] += var;
     	                plus = false;
     	            } else if (res[i][j] - var > 0) {
     	                res[i][j] -= var;
     	                plus = true;
     	            }
     	        }
     	    }
     
     	    System.out.println();
     	    System.out.println("Matrix A (tag-tag, pseudo-random-generated):");
     	    ViterbiMatrixTools.printMatrix(res);
     	    System.out.println();
     	    return res;
     	}
     
     
     	private void printMap(Map<String, ?> map) {
     	    for (Map.Entry<String, ?> e : map.entrySet()) {
            System.out.println(e.getKey() + ": " + e.getValue());
        }
    }
     
     
    	private void countLexems() {
    	    freq = new HashMap<String, Integer>();
    	    for (StringTokenizer tok = new StringTokenizer(corpus, " \t\n.,", true);
    	         tok.hasMoreTokens(); ) {
    	        String rec = tok.nextToken();
    	        if (lexicon.containsKey(rec)) {
    	            if (freq.containsKey(rec)) {
    	                freq.put(rec, freq.get(rec) + 1);
    	            } else {
    	                freq.put(rec, 1);
    	            }
    	        }
    	    }
    	}
     
    }


    ViterbiHMM.java
     
    import java.util.Arrays;
    import java.util.Map;
     
      public class ViterbiHMM extends AbstractHMM {
          private double[][] delta;
          private int[][] psi;
          private String[] hiddenAlphabet;
          private String[] observableAlphabet;
          private String[] observation;
          private boolean absoluteValues;
          public ViterbiHMM(String a, String obsA, String obs,
                  Map<String, String> lexicon, String corpus, boolean absoluteValues) {
              super(a, obsA, ". " + obs, lexicon, corpus);
              this.absoluteValues = absoluteValues;
          }
        @Override
          public String mostProbableSequence() {
     
      	init();
      	induct();
     
              System.out.println("Delta:");
              ViterbiMatrixTools.printMatrix(delta);
              System.out.println();
              System.out.println("Psi:");
              ViterbiMatrixTools.printMatrix(psi);
              System.out.println();
              return getResult();
         }
     
          private void init() {
              hiddenAlphabet = a.split("\\s");
              observableAlphabet = obsA.split("\\s");
              observation = obs.split("\\s");
              delta = new double[hiddenAlphabet.length][observation.length];
              delta[delta.length - 1][0] = 1.0;
              psi = new int[hiddenAlphabet.length][observation.length - 1];
              for (int i = 0; i < psi.length; i++) {
                  Arrays.fill(psi[i], -1);
              }
          }
     
     
          private void induct() {
              // (1)
              for (int i = 1; i < observation.length; i++) {
                  // (2)
                 for (int j = 0; j < hiddenAlphabet.length; j++) {
                     double prevTagMax = ViterbiMatrixTools.maximimumForCol(
                             i - 1, delta);
                     // (3)
                      int lexIndex = getIndex(observation[i], observableAlphabet);
                      // (4)
     
                      double prob = probForWordToTag(lexIndex + 1, j, B, A);
                      double res = prevTagMax * prob;
                      delta[j][i] = res;
                      if (res > 0.0)
                          psi[j][i - 1] = ViterbiMatrixTools.indexOfMaximimumForCol(
                                  i - 1, delta);
                  }
     
              }
         }
     
     
          private double probForWordToTag(int i, int j, double[][] b, double[][] a) {
              // delta has the leading period, therefore - 1 for previous:
     
              int prevIndex = ViterbiMatrixTools.indexOfMaximimumForCol(i - 1, delta);
              // b doesn't have the leading p, therefore -1 for recent:
     
              if (absoluteValues)
                  return (b[i - 1][j] / ViterbiMatrixTools.sumForCol(j, B))
                          * (A[prevIndex][j] / ViterbiMatrixTools.sumForRow(
                                  prevIndex, A));
              else {
                 return b[i - 1][j] * A[prevIndex][j];
             }
         }
     
     
         private String getResult() {
             String[] resultArray = new String[psi[0].length];
             int lastIndexInPsi = ViterbiMatrixTools.indexOfMaximimumForCol(
                     delta[0].length - 1, delta);
             if (lastIndexInPsi == -1) {
                 System.out.println("no tag-sequence found for input, exit.");
                 System.exit(0);
             }
             int lastValueInPsi = psi[lastIndexInPsi][psi[0].length - 1];
             String lastTag = hiddenAlphabet[lastIndexInPsi];
             resultArray[resultArray.length - 1] = lastTag;
             // retrieve other tags:
     
            for (int i = psi[0].length - 2; i >= 0; i--) {
                resultArray[i] = hiddenAlphabet[lastValueInPsi];
                lastValueInPsi = psi[lastValueInPsi][i];
         }
            StringBuilder resultString = new StringBuilder();
            for (int i = 0; i < resultArray.length; i++) {
                resultString.append(resultArray[i]);
                if (i < resultArray.length - 1)
                    resultString.append(" ");
            }
            return resultString.toString();
        }
     
     
        int getIndex(String string, String[] lexicon) {
            for (int i = 0; i < lexicon.length; i++) {
                if (string.equals(lexicon[i]))
                    return i;
            }
     
            System.out.println("Word '" + string + "' not found in lexicon, exit.");
            System.exit(0);
            return -1;
        }
     
    }

    ViterbiMatrixTools.java
     
    import java.text.NumberFormat;
     
     
      public class ViterbiMatrixTools {
     
      	static double sumForCol(int i, double[][] matrix) {
      	    double sum = 0;
      	    for (int j = 0; j < matrix.length; j++) {
      	        sum += matrix[j][i];
      	    }
      	    return sum;
      	}
     
     
      	static double sumForRow(int i, double[][] matrix) {
      	    double sum = 0;
      	    for (int j = 0; j < matrix[i].length; j++) {
      	        sum += matrix[i][j];
      	    }
      	    return sum;
      	}
     
     
      	static double maximimumForCol(int i, double[][] matrix) {
      	    double maxValue = 0.0;
      	    for (int j = 0; j < matrix.length; j++) {
      	        maxValue = Math.max(maxValue, matrix[j][i]);
      	    }
      	    return maxValue;
      	}
     
     
      	static int indexOfMaximimumForCol(int i, double[][] matrix) {
      	    int maxIndex = -1;
      	    double maxValue = -1.0;
      	    for (int j = 0; j < matrix.length; j++) {
      	        if (matrix[j][i] > maxValue) {
      	            maxIndex = j;
      	            maxValue = matrix[j][i];
      	        }
      	    }
      	    return maxIndex;
      	}
     
     
      	static int indexOfMaximimumForCol(int i, int[][] matrix) {
      	    int maxIndex = -1;
      	    int maxValue = -1;
      	    for (int j = 0; j < matrix.length; j++) {
      	        if (matrix[j][i] > maxValue) {
      	            maxIndex = j;
      	            maxValue = matrix[j][i];
      	        }
      	    }
      	    return maxIndex;
      	}
     
     
      	static void printMatrix(double[][] matrix) {
      	    for (int i = 0; i < matrix.length; i++) {
      	        for (int j = 0; j < matrix[i].length; j++) {
      	            String myString = NumberFormat.getInstance().format(
      	                    matrix[i][j]);
      	            if (myString.length() < 5) {
      	                for (int k = myString.length(); k < 5; k++) {
      	                    myString += " ";
      	                }
      	            }
      	            System.out.print(myString + "   ");
      	        }
      	        System.out.println();
      	    }
      	}
     
     
     	static void printMatrix(int[][] matrix) {
     	    for (int i = 0; i < matrix.length; i++) {
     	        for (int j = 0; j < matrix[i].length; j++) {
     	            if (matrix[i][j] >= 0)
     	                System.out.print(" ");
     	            System.out.print(matrix[i][j] + "   ");
     	        }
     	        System.out.println();
     	    }
     	}
     
    }

  20. #20
    Super Moderator Norm's Avatar
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    Default Re: Matrix Generator

    .i am still not able to get an output
    Did you add printlns to all the methods and constructors?
    Did any of them print out a message?
    They won't print anything if they are not executed. Check the code to see why none of the constructors or methods are being called.
    For example I do NOT see a println at the beginning of the main() method.
    Also there is no println in the Tag class constructor.
    If you don't understand my answer, don't ignore it, ask a question.

  21. #21
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    Default Re: Matrix Generator

    none of the classes are giving an output...

  22. #22
    Super Moderator Norm's Avatar
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    Default Re: Matrix Generator

    What about the main() method?
    How are you executing the code? If you try to execute a class without a main method the java command will give an error message. So if you have a println in the main() method it should print something.
    If you don't understand my answer, don't ignore it, ask a question.

  23. #23
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    Default Re: Matrix Generator

    Do i need to use the try and catch method to invoke the methods??

  24. #24
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    Default Re: Matrix Generator

    It depends on the methods. If they are defined to throw an exception, then you would need to be ready to handle that exception by putting the calls to the methods in a try/catch block.
    If you don't understand my answer, don't ignore it, ask a question.

  25. #25
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    Default Re: Matrix Generator

    how about get method?

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