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Is empty string the same as null?
An empty string is a string instance of zero length, whereas a null string has no value at all. It is a character sequence of zero characters. A null string is represented by null . It can be described as the absence of a string instance.
Is string null by default?
Because string is a reference type and the default value for all reference types is null .
What is default String value?
Default Values
| Data Type | Default Value (for fields) |
|---|---|
| float | 0.0f |
| double | 0.0d |
| char | ” |
| String (or any object) | null |
Which is true, an empty string or a null?
null is an object, empty is a string, undefined is undefined. It is true that null==undefined, but false when it comes to null===undefined. We can safely use xxx==null to check both null and undefined. Interestingly, an empty string is totally not equals to null and undefined.
What’s the difference between NULL, empty, and undefined?
null is used to explicitly define “nothing”. undefined refers to a value that has not been assigned. empty refers to an empty string. null is an object, empty is a string, undefined is undefined. It is true that null==undefined, but false when it comes to null===undefined.
What’s the difference between null and default values?
NULL value does not have the data type, therefore can be inserted to any data structure and any database column. Default values, on the other hand, need to have their data type specified and a default value in one column might look the same in another column, but it might be of a different type.
What’s the difference between an empty string in Java?
An empty string, however, is a value – it is a string of no characters. Null is essentially ‘nothing’ – it’s the default ‘value’ (to use the term loosely) that Java assigns to any Object variable that was not initialized.