For all built-in Python objects (like strings, lists, dicts, functions, etc.), if x is y, then x==y is also True. Not always. NaN is a counterexample. But usually, identity (is) implies equality (==). The converse is not true: Two distinct objects can have the same value. Also, is it generally considered better to just use … Read more
array1.equals(array2) is the same as array1 == array2, i.e. is it the same array. As @alf points out it’s not what most people expect. Arrays.equals(array1, array2) compares the contents of the arrays. Similarly array.toString() may not be very useful and you need to use Arrays.toString(array).
In Python 2.x this is not guaranteed as it is possible for True and False to be reassigned. However, even if this happens, boolean True and boolean False are still properly returned for comparisons. In Python 3.x True and False are keywords and will always be equal to 1 and 0. Under normal circumstances in … Read more
is is identity testing, == is equality testing. what happens in your code would be emulated in the interpreter like this: >>> a=”pub” >>> b = ”.join([‘p’, ‘u’, ‘b’]) >>> a == b True >>> a is b False so, no wonder they’re not the same, right? In other words: a is b is the … Read more
is will return True if two variables point to the same object (in memory), == if the objects referred to by the variables are equal. >>> a = [1, 2, 3] >>> b = a >>> b is a True >>> b == a True # Make a new copy of list `a` via the … Read more
In general, the answer to your question is “yes”, but… .equals(…) will only compare what it is written to compare, no more, no less. If a class does not override the equals method, then it defaults to the equals(Object o) method of the closest parent class that has overridden this method. If no parent classes … Read more
== tests for reference equality (whether they are the same object). .equals() tests for value equality (whether they are logically “equal”). Objects.equals() checks for null before calling .equals() so you don’t have to (available as of JDK7, also available in Guava). Consequently, if you want to test whether two strings have the same value you … Read more
Which equals operator (== vs ===) should be used in JavaScript comparisons?