In Java, null is a reserved word for literal values . It seems like a keyword, but actually, it is a literal similar to true and false.
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Is null an Object in Java? No it’s not , and for those who wonder why such a question, there are languages where null is indeed an object like any, for example Ruby. In Scala, which is very meticulous about types, there is a type Null (a trait, actually) having a single instance null .
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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.
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There’s no null in Python; instead there’s None . As stated already, the most accurate way to test that something has been given None as a value is to use the is identity operator , which tests that two variables refer to the same object.
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No , null is not an object .It is a reference type and its value does not refer to any object and so there is no representation of null in memory.
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You can use the IsNullOrWhiteSpace method to test whether a string is null , its value is String. Empty, or it consists only of white-space characters.
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isEmpty(String str) – Checks if a String is empty (“”) or null. StringUtils. isBlank(String str) – Checks if a String is whitespace, empty (“”) or null. For non-Java users like myself; be sure to include import org.
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