[黑马程序员]集合_HashSet的equals方法

同ArrayList一样,如果要判断对象,需要自己覆写.

原code: 

    public boolean equals(Object o) {if (o == this)    return true;if (!(o instanceof Set))    return false;Collection c = (Collection) o;if (c.size() != size())    return false;        try {            return containsAll(c);        } catch (ClassCastException unused)   {            return false;        } catch (NullPointerException unused) {            return false;        }    }