HashSet illustration

import java.util.HashSet;

public class testCollections {

    /*
     * testObj is just a wrapper for an int and will be used in an experiment to test hashing and so on
     */
    private class testObj {

        private int value = 0;

        public testObj(int newValue) {
            value = newValue;
        }

        public int getValue() {
            return value;
        }

        public boolean equals(Object o) {

            if(!(o instanceof testObj)) {
                return false;
            }

            if(o == this) {
                return true;
            }
            testObj newO = (testObj) o;

            if(newO.getValue() == value) {
                return true;
            }

            return false;
        }

        public int hashCode() {
            return value;
        }

    }

    public static void main(String[] args) {
        HashSet<testObj> mySet = new HashSet<testObj>();
        testObj temp = new testCollections().new testObj(5);
        mySet.add(temp);
        System.out.print("The set now ");
        System.out.print( (mySet.contains(temp)) ?  "contains " : "does not contain ");
        System.out.println("object with value " + temp.getValue() + " and reference " + temp.toString());
        System.out.println("Adding another of the same object.");
        if(mySet.add(temp)) {
            System.out.println("Add successful.");
        }
        else {
            System.out.println("Add unsuccessful.");
        }
        System.out.println("Are there two of the same object now? Will try to remove one and then see if one is still in there.");
        if(mySet.remove(temp)) {
            System.out.println("Removed it.");
        }
        else {
             System.out.println("Couldn't remove it because it wasn't there.");
        }
        System.out.print("The set now ");
        System.out.print( (mySet.contains(temp)) ? "still contains " : " does not contain ");
        System.out.println("object with value " + temp.getValue() + " and reference " + temp.toString());
        if(mySet.remove(temp)) {
            System.out.println("Removed it.");
        }
        else {
             System.out.println("Couldn't remove it because it wasn't there.");
        }

        System.out.println();
        System.out.println("------------------");
        System.out.println();
        testObj temp2 = new testCollections().new testObj(5);
        System.out.println("The HashSet is currently empty? " + mySet.isEmpty());
        System.out.println("Have created a second object with the same hashcode.");
        System.out.println("The two objects are equal? " + temp.equals(temp2));
        System.out.println("temp.hashCode is " + temp.hashCode() + " and temp2.hashCode is " + temp2.hashCode());
        System.out.println("Adding temp to the HashSet.");
        mySet.add(temp);
        System.out.println("The HashSet contains temp? " + mySet.contains(temp));
        System.out.println("The HashSet contains temp2? " + mySet.contains(temp2));
        System.out.println("That is true because their hashCode and .equals values return the same thing.");
        System.out.println("Now attempting to add temp2 to the HashSet.");
        if(mySet.add(temp2)) {
            System.out.println("Successfully added temp2");
        }
        else {
            System.out.println("Could not add temp2 because value already exists.");
        }

    }

}