Package org.apache.commons does not exist

Question

I would like to use EnumeratedIntegerDistribution()out org.apache.commons.math3.distributionto get a discrete probability distribution

int[] nums_to_generate          = new int[]    { -1,   1,    0  };
double[] discrete_probabilities = new double[] { 0.4, 0.4, 0.2  };

I work with jdk7, on windows Xp, working from the command line

I do:

• add to source file

  import org.apache.commons.math3; 
  

• download commons-math3-3.2 and unzip it into my current folder

• Compile my source using classpath: (either)

  javac -cp ./commons-math3-3.2/commons-math3-3.2.jar:. ConflictsAnimation.java
  javac -cp   commons-math3-3.2/commons-math3-3.2.jar   ConflictsAnimation.java
  

However, I have a mysterious

    "error: package org.apache.commons does not exist"

Who knows what is going on? I really need some help.

Note:

compilation (and start) in order without a class path and without importing "apache" and calling for numberatedIntegerDistribution ().

using classpath and without "appache" are meaningless errors.

Thank you very much for your excellent skills, programmers!

---

Here is a short demo:

import java.lang.Math.*;
import org.apache.commons.math3;

public class CheckMe {

    public CheckMe() {

        System.out.println("let us check it out"); 
        System.out.println(generate_rand_distribution (10));
    }

    private static int[] generate_rand_distribution (int count){
    int[] nums_to_generate          = new int[]    { -1,   1,    0  };
        double[] discrete_probabilities = new double[] { 0.4, 0.4, 0.2  };
    int[] samples = null;

        EnumeratedIntegerDistribution distribution = 
        new EnumeratedIntegerDistribution(nums_to_generate, discrete_probabilities);

        samples = distribution.sample (count);

    return (samples);
    }   

    public static void main (String args[]) { 
        System.out.println("Main: ");
        CheckMe  animation = new CheckMe();  
    } 
}

Answer 1

:

import org.apache.commons.math3;

- . :

import org.apache.commons.math3.*;

:

import org.apache.commons.math3.SomeTypeHere;

, :

import org.apache.commons.math3.distribution.EnumeratedIntegerDistribution;

jar, Apache, .