ADT Set (array set) in java, removing items and intersection and union of sets

ADT Set (array set) in java, removing items and intersection and union of
sets

Note: This is for an assignment
I can't figure out how to write the intersecting & union methods-- this is
one of my first CS classes that I've taken and I'm having a difficult
time. Can anyone offer any assistance?
public class ArraySet<T> implements SetInterface<T>
{
private final T[] set;
private static final int defaultCapacity = 10;
private int count;
public ArraySet(int aCapacity)
{
count = 0;
T[] tempSet = (T[]) new Object [aCapacity];
set = tempSet;
}
public ArraySet()
{
this (defaultCapacity);
}
public void insert(T anElement)
{
if (set.equals(anElement))
{
return;
} else {
set[count] = anElement;
count ++;
}
}
public T remove()
{
T result = remove (count - 1);
return result;
}
public int getCurrentSize()
{
return count;
}
public boolean isEmpty()
{
return count == 0;
}
public String toString()
{
String temp = new String ();
}
public boolean in(T anElement)
{
boolean result = true;
if (a.equals(anElement))
{
result = false;
} else {
}
public SetInterface<T> intersect(SetInterface<T> rhsSet)
{
/**
* Perform union operation between this set and the rhsSet.
* @param rhsSet the set to be unioned with.
* @return a new set which is the result of this set unions with
* rhsSet.
*/
}
public SetInterface<T> union(SetInterface<T> rhsSet)
{
/**
* Perform diff operation between this set and the rhsSet.
* @param rhsSet the set to be diffed with.
* @return a new set which is the result of this set diffs with
* rhsSet.
*/
}
public SetInterface<T> diff(SetInterface<T> rhsSet)
{
/**
* See whether this set is a subset of rhsSet.
* @param rhsSet an input set.
* @return true if this set is a subset of rhsSet, false otherwise.
*/
}
public boolean subsetOf(SetInterface<T> rhsSet)
{
/**
* See whether this set is equal to the set otherObject.
* Note that this method overrides the method equals of the class
* Object.
* @param otherObject an input set.
* @return true if this set is equal the set otherObject.
*/
}
public boolean equals(Object otherObject)
{
/**
* Creates an array of all elements that are in this set.
* @return a newly allocated array of all the entries in this set.
*/
}
public T[] toArray()
{
T[] result = (T[]) new Object [count];
for (int index = 0; index < count; index++)
{
result [index] = set [index];
}
return result;
}
}