Package net.sf.json

Class JSONNull

  • All Implemented Interfaces:
    Serializable, JSON
    public final class JSONNull
extends Object
implements JSON
    JSONNull is equivalent to the value that JavaScript calls null, whilst Java's null is equivalent to the value that JavaScript calls undefined.
    Author:
    JSON.org
    See Also:
    Serialized Form

    • Method Detail

      • getInstance

        public static JSONNull getInstance()
        Returns the singleton instance of JSONNull

      • equals

        public boolean equals​(Object object)
        A Null object is equal to the null value and to itself.
        Overrides:
        equals in class Object
        Parameters:
        object - An object to test for nullness.
        Returns:
        true if the object parameter is the JSONObject.NULL object or null.

      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class Object

      • isArray

        public boolean isArray()
        Description copied from interface: JSON
        Returns true if this object is a JSONArray, false otherwise.
        Specified by:
        isArray in interface JSON

      • isEmpty

        public boolean isEmpty()
        Description copied from interface: JSON
        Returns true if this object has no elements or keys.
        Specified by:
        isEmpty in interface JSON

      • size

        public int size()
        Description copied from interface: JSON
        Returns the number of properties in an object or the size of the array.
        Specified by:
        size in interface JSON
        Returns:
        the size of an json object or array

      • toString

        public String toString()
        Get the "null" string value.
        Overrides:
        toString in class Object
        Returns:
        The string "null".

      • toString

        public String toString​(int indentFactor)
        Description copied from interface: JSON
        Make a prettyprinted JSON text.

        Warning: This method assumes that the data structure is acyclical.

        Specified by:
        toString in interface JSON
        Parameters:
        indentFactor - The number of spaces to add to each level of indentation.
        Returns:
        a printable, displayable, portable, transmittable representation of the object, beginning with { (left brace) and ending with } (right brace).

      • toString

        public String toString​(int indentFactor,
                       int indent)
        Description copied from interface: JSON
        Make a prettyprinted JSON text.

        Warning: This method assumes that the data structure is acyclical.

        Specified by:
        toString in interface JSON
        Parameters:
        indentFactor - The number of spaces to add to each level of indentation.
        indent - The indentation of the top level.
        Returns:
        a printable, displayable, transmittable representation of the object, beginning with { (left brace) and ending with } (right brace).

      • write

        public Writer write​(Writer writer)
             throws IOException
        Description copied from interface: JSON
        Write the contents as JSON text to a writer. For compactness, no whitespace is added.

        Warning: This method assumes that the data structure is acyclical.

        Specified by:
        write in interface JSON
        Returns:
        The writer.
        Throws:
        IOException