Help Java

you will be writing an ArrayList implementation of a Set data structure. Recall from math that sets are collections of objects where:

order does not matter

elements cannot repeat

For example, a set may look as follows: A = {3, 5, a, d}. In this case:

The set name is A

The set has 4 elements (3, 5, a, and d)

The order does not matter - for example, A could have been represented as: {a, 5, d, 3}

The starter code for this data structure is:

public class Set { private ArrayList elements;

public Set () { elements = new ArrayList(); }

public String toString () {

//Will display the set in the format {e1, e2, e3,...,en} where e1 through en are the elements in the set

boolean printComma = false;

StringBuilder sb = new StringBuilder();

sb.append("{");

for (int i = 0; i < elements.size(); i++) {

if (i != 0) {

sb.append(", ");

}

sb.append(elements.get(i));

}

sb.append("}");

return sb.toString();

}

}