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 
public class org.json.JSONStringer extends org.json.JSONWriter
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.json.JSONStringer
  super_class: org.json.JSONWriter
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.json.JSONStringer this
         0: .line 64
            aload 0 /* this */
            new java.io.StringWriter
            dup
            invokespecial java.io.StringWriter.<init>:()V
            invokespecial org.json.JSONWriter.<init>:(Ljava/lang/Appendable;)V
         1: .line 65
            return
        end local 0 // org.json.JSONStringer this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/json/JSONStringer;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.json.JSONStringer this
         0: .line 77
            aload 0 /* this */
            getfield org.json.JSONStringer.mode:C
            bipush 100
            if_icmpne 1
            aload 0 /* this */
            getfield org.json.JSONStringer.writer:Ljava/lang/Appendable;
            invokevirtual java.lang.Object.toString:()Ljava/lang/String;
            goto 2
      StackMap locals:
      StackMap stack:
         1: aconst_null
      StackMap locals:
      StackMap stack: java.lang.String
         2: areturn
        end local 0 // org.json.JSONStringer this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/json/JSONStringer;
}
SourceFile: "JSONStringer.java"