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static final class: JSONObject.Null [javadoc | source]
JSONObject.NULL is equivalent to the value that JavaScript calls null, whilst Java's null is equivalent to the value that JavaScript calls undefined.
Method from org.apache.tomcat.util.json.JSONObject$Null Summary:
clone,   equals,   toString
Methods from java.lang.Object:
clone,   equals,   finalize,   getClass,   hashCode,   notify,   notifyAll,   toString,   wait,   wait,   wait
Method from org.apache.tomcat.util.json.JSONObject$Null Detail:
 protected final Object clone() 
    There is only intended to be a single instance of the NULL object, so the clone method returns itself.
 public boolean equals(Object object) 
    A Null object is equal to the null value and to itself.
 public String toString() 
    Get the "null" string value.