Quine.java

package com.publicobject.quine;

import com.squareup.javapoet.FieldSpec;
import com.squareup.javapoet.JavaFile;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeSpec;
import javax.lang.model.element.Modifier;

class Quine {
  static String PACKAGE = "com.publicobject.quine";

  public static void main(String[] args) {
    String string = "$S";
    String body = "String string = $S;\n"
        + "String body = $S;\n"
        + "System.out.println($T.builder(PACKAGE, $T.classBuilder(\"Quine\")\n"
        + "    .addField($T.builder(String.class, \"PACKAGE\", Modifier.STATIC)\n"
        + "        .initializer($S, PACKAGE)\n"
        + "        .build())\n"
        + "    .addMethod($T.methodBuilder(\"main\")\n"
        + "        .addModifiers($T.PUBLIC, $T.STATIC)\n"
        + "        .addParameter(String[].class, \"args\")\n"
        + "        .addCode(body, string, body, JavaFile.class, TypeSpec.class, FieldSpec.class, string, MethodSpec.class, Modifier.class, Modifier.class)\n"
        + "        .build())\n"
        + "    .build())\n"
        + "    .skipJavaLangImports(true)\n"
        + "    .build());\n";
    System.out.println(JavaFile.builder(PACKAGE, TypeSpec.classBuilder("Quine")
        .addField(FieldSpec.builder(String.class, "PACKAGE", Modifier.STATIC)
            .initializer("$S", PACKAGE)
            .build())
        .addMethod(MethodSpec.methodBuilder("main")
            .addModifiers(Modifier.PUBLIC, Modifier.STATIC)
            .addParameter(String[].class, "args")
            .addCode(body, string, body, JavaFile.class, TypeSpec.class, FieldSpec.class, string, MethodSpec.class, Modifier.class, Modifier.class)
            .build())
        .build())
        .skipJavaLangImports(true)
        .build());
  }
}