The equals() method of StringUtils class is a null-safe version of the equals() method of String class , which also handles null values.
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It’s entirely possible for two distinct object instances to be “equal” according to their contract. And then there’s the minor detail that since equals is a method, if you try to invoke it on a null reference, you’ll get a NullPointerException .
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Consequently, if both arguments are null, it returns true and if exactly one argument is null, it returns false. Otherwise, it then simply calls the equals() method of the passed argument’s type’s class – which in our case is String’s class equals() method.
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7. == and != The comparison and not equal to operators are allowed with null in Java . This can made useful in checking of null with objects in java.3 Oca 2020
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If you think of it from a programming (i.e. pointer reference) point of view then, yes, two references of null have the same pointer value and, since most of the popular languages will fall back to pointer-equality if no custom equality is defined, null does equal null .
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null is one of JavaScript’s primitive values. It is neither equal to boolean true nor equal to boolean false because it’s value is undefined . The value of null is more inclined towards false even though it is not false .
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