Menu
What is mechanism below that makes equal different types?
import static org.testng.Assert.assertEquals; @Test public void whyThisIsEqual() { assertEquals(new HashSet<>(), new ArrayList<>()); } 
533
When you compare 2 lists with each other, the equals method will NOT compare the items that are in that list. It will just compare the List object with the other List object. these have their own 'identity'.
Meaning if both lists are empty the last condition is evaluated, which results in true. "Meaning if both lists are empty" Not just if they're empty: if they both contain all null elements (and are the same size), they're also equal.
Collections. emptyList() : method used to return an empty list. Collections. emptySet() : method used to return an empty set.
The assertEquals(Collection<?> actual, Collection<?> expected) documentation says:
Asserts that two collections contain the same elements in the same order. If they do not, an AssertionError is thrown.
Thus the content of the collections will be compared which, in case both the collections are empty, are equal.
183
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
