import java.io.*;

import java.util.*;

public class MyHashSet

{

private int numBuckets;

private Node[] buckets; // YOU MUST DESIGN THIS CLASS FOR PROJECT

private int[] bucketSizes;

private int idealBucketSize;

private int size; // # keys stored in set

public MyHashSet( int numBuckets, int idealBucketSize )

{ size=0;

this.numBuckets = numBuckets;

this.idealBucketSize = idealBucketSize;

bucketSizes = new int[numBuckets]; // OF KEYS IN EACH [i] BUCKET

}

public MyHashSet(int numBuckets)

{

size=0;

this.numBuckets = numBuckets;

buckets = new Node[numBuckets];

}

// KEYS ARE -NOT- REALLY BEING ADDED IN THIS LAB. JUST HASHED, AND BUCKET COUNTER INCREMENTED

public boolean add( String key )

{

int h = hashOf( key, numBuckets ); // h MUST BE IN [0..numBuckets-1]

++bucketSizes[h];

++size;

return true;

}

// RETURNS INT IN RANGE [0..numBuckets-1]

private int hashOf( String key, int numBuckets ) // h MUST BE IN [0..numBuckets-1]

{

return Math.abs(key.hashCode()) % numBuckets; // REPLACE WITH YOUR ALGORITHM

}

public void printStats()

{

System.out.format("#OfBucket: %d idealBucketSize: %d #OfKeysHashed: %d ", bucketSizes.length, idealBucketSize, size() );

if (bucketSizes.length

if (bucketSizes.length

int minBucketSize=bucketSizes[0], maxBucketSize=bucketSizes[0];

for (int i=0 ; i

{

if (bucketSizes.length

if ( bucketSizes[i] > maxBucketSize )

maxBucketSize=bucketSizes[i];

else if ( bucketSizes[i]

minBucketSize=bucketSizes[i];

}

if (bucketSizes.length

System.out.format("minBucketSize %dmaxBucketSize %d ",minBucketSize,maxBucketSize);

System.out.format("stdDev %4.2fvar %4.2f ",stdDev(bucketSizes),variance(bucketSizes) );

}

// Function for calculating variance

double variance(int a[])

{

int sum = 0;

for (int i = 0; i

sum += a[i];

double mean = (double)sum / (double)a.length;

double sqDiff = 0.0;

for (int i = 0; i

sqDiff += (a[i] - mean) * (a[i] - mean);

return sqDiff / a.length;

}

double stdDev(int a[])

{

return Math.sqrt(variance(a));

}

public int size()

{

return size;

}

} //END MYGRAPH CLASS

I need help. is giving me this error

MyHashSet.java:7: error: cannot find symbol

private Node[] buckets; // YOU MUST DESIGN THIS CLASS FOR PROJECT

^

symbol:class Node

location: class MyHashSet

MyHashSet.java:22: error: cannot find symbol

buckets = new Node[numBuckets];

^

symbol:class Node

location: class MyHashSet

2 errors

I'm try to get this output

\f