Package net.sf.json
Class JSONNull
- java.lang.Object
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- net.sf.json.JSONNull
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- All Implemented Interfaces:
java.io.Serializable
,JSON
public final class JSONNull extends java.lang.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
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
equals(java.lang.Object object)
A Null object is equal to the null value and to itself.static JSONNull
getInstance()
Returns the singleton instance of JSONNullint
hashCode()
boolean
isArray()
Returns true if this object is a JSONArray, false otherwise.boolean
isEmpty()
Returns true if this object has no elements or keys.int
size()
Returns the number of properties in an object or the size of the array.java.lang.String
toString()
Get the "null" string value.java.lang.String
toString(int indentFactor)
Make a prettyprinted JSON text.java.lang.String
toString(int indentFactor, int indent)
Make a prettyprinted JSON text.java.io.Writer
write(java.io.Writer writer)
Write the contents as JSON text to a writer.java.io.Writer
writeCanonical(java.io.Writer w)
Writes the canonicalized form of this JSON object.
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Method Detail
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getInstance
public static JSONNull getInstance()
Returns the singleton instance of JSONNull
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equals
public boolean equals(java.lang.Object object)
A Null object is equal to the null value and to itself.- Overrides:
equals
in classjava.lang.Object
- Parameters:
object
- An object to test for nullness.- Returns:
- true if the object parameter is the JSONObject.NULL object or null.
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hashCode
public int hashCode()
- Overrides:
hashCode
in classjava.lang.Object
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isArray
public boolean isArray()
Description copied from interface:JSON
Returns true if this object is a JSONArray, false otherwise.
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isEmpty
public boolean isEmpty()
Description copied from interface:JSON
Returns true if this object has no elements or keys.
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size
public int size()
Description copied from interface:JSON
Returns the number of properties in an object or the size of the array.
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toString
public java.lang.String toString()
Get the "null" string value.- Overrides:
toString
in classjava.lang.Object
- Returns:
- The string "null".
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toString
public java.lang.String toString(int indentFactor)
Description copied from interface:JSON
Make a prettyprinted JSON text.Warning: This method assumes that the data structure is acyclical.
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toString
public java.lang.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 interfaceJSON
- 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).
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write
public java.io.Writer write(java.io.Writer writer) throws java.io.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.
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writeCanonical
public java.io.Writer writeCanonical(java.io.Writer w) throws java.io.IOException
Description copied from interface:JSON
Writes the canonicalized form of this JSON object.- Specified by:
writeCanonical
in interfaceJSON
- Throws:
java.io.IOException
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