https://github.com/douglascrockford/JSON-java: JSON is a light-weight, language independent, data interchange format. See http://www.JSON.org/ The files in this package implement JSON encoders/decoders in Java. It also includes the capability to convert between JSON and XML, HTTP headers, Cookies, and CDL. This is a reference implementation. There is a large number of JSON packages in Java. Perhaps someday the Java community will standardize on one. Until then, choose carefully. The license includes this restriction: "The software shall be used for good, not evil." If your conscience cannot live with that, then choose a different package.
  • Douglas Crockford 
final class org.json.JSONObject$Null
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: org.json.JSONObject$Null
  super_class: java.lang.Object
{
  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.json.JSONObject$Null this
         0: .line 109
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.json.JSONObject$Null this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/json/JSONObject$Null;

  protected final java.lang.Object clone();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.json.JSONObject$Null this
         0: .line 119
            aload 0 /* this */
            areturn
        end local 0 // org.json.JSONObject$Null this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/json/JSONObject$Null;

  public boolean equals(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.json.JSONObject$Null this
        start local 1 // java.lang.Object object
         0: .line 132
            aload 1 /* object */
            ifnull 1
            aload 1 /* object */
            aload 0 /* this */
            if_acmpeq 1
            iconst_0
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_1
            ireturn
        end local 1 // java.lang.Object object
        end local 0 // org.json.JSONObject$Null this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/json/JSONObject$Null;
            0    2     1  object  Ljava/lang/Object;
    MethodParameters:
        Name  Flags
      object  

  public int hashCode();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.json.JSONObject$Null this
         0: .line 141
            iconst_0
            ireturn
        end local 0 // org.json.JSONObject$Null this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/json/JSONObject$Null;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.json.JSONObject$Null this
         0: .line 151
            ldc "null"
            areturn
        end local 0 // org.json.JSONObject$Null this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/json/JSONObject$Null;
}
SourceFile: "JSONObject.java"
NestHost: org.json.JSONObject
InnerClasses:
  private final Null = org.json.JSONObject$Null of org.json.JSONObject