There is some method that accepts String value , which returns the following string, the meaning of which is not quite clear to me:

 return value == null || "null".equalsIgnoreCase(value);

As I understand it, this method returns null if value matches "null" ?

    1 answer 1

    This string returns a boolean value. Rewrite the words:

     value == null || "null".equalsIgnoreCase(value);

    value is null or the string "null" is equal to case-insensitive.

    So the method returns true if value is null , "null" or "Null" .

    To understand expressions, you can put brackets in them:

     (value==null) || ("null".equalsIgnoreCase(value))

    or split into separate steps and check what comes back at each step:

     boolean isNull = value==null; boolean isStringNull = "null".equalsIgnoreCase(value); return isNull || isStringNull;

    either run the code and experiment with different values ​​of value