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//: holding/Statistics.java

// Simple demonstration of HashMap.

import java.util.*;

public class Statistics {

public static void main(String[] args) {

Random rand = new Random(47);

Map<Integer,Integer> m =

new HashMap<Integer,Integer>();

for(int i = 0; i < 10000; i++) {

// Produce a number between 0 and 20:

int r = rand.nextInt(20);

Integer freq = m.get(r);

m.put(r, freq == null ? 1 : freq + 1);

}

System.out.println(m);

}

} /* Output:

{15=497, 4=481, 19=464, 8=468, 11=531, 16=533, 18=478, 3=508, 7=471, 12=521, 17=509, 2=489, 13=506, 9=549, 6=519, 1=502, 14=477, 10=513, 5=503, 0=481}

*///:~