public super class {
  version 52.0;
  name ThisClass; 
  extends Object;

   //Constants

  const classref ThisClass ThisClass_name;
  const utf8 ThisClass_name "org/jasm/examples/CalculateSum";

  const classref Object Object_name;
  const utf8 Object_name "java/lang/Object";

  const classref System System_name;
  const utf8 System_name "java/lang/System";

  const utf8 out_name "out";
  const utf8 out_desc "Ljava/io/PrintStream;";
  const nameandtype System.out_nat out_name,out_desc;
  const fieldref System.out System,System.out_nat;

  const classref PrintStream PrintStream_name;
  const utf8 PrintStream_name "java/io/PrintStream";

  const utf8 println_name "println";
  const utf8 println_desc "(Ljava/lang/Object;)V";
  const nameandtype PrintStream.println_nat println_name,println_desc;
  const methodref PrintStream.println PrintStream,PrintStream.println_nat;

  const utf8 init0_name "<init>";
  const utf8 init0_desc "()V";
  const methodref Object.init0 Object, Object.init0_nat; 
  const nameandtype Object.init0_nat init0_name, init0_desc;

  const classref StringBuffer StringBuffer_name;
  const utf8 StringBuffer_name "java/lang/StringBuffer";

  const methodref StringBuffer.init0 StringBuffer, StringBuffer.init0_nat;
  const nameandtype StringBuffer.init0_nat init0_name, init0_desc;

  const utf8 append_name "append";
  const utf8 appendObject_desc "(Ljava/lang/Object;)Ljava/lang/StringBuffer;";
  const nameandtype StringBuffer.appendObject_nat append_name,appendObject_desc;
  const methodref StringBuffer.appendObject StringBuffer,StringBuffer.appendObject_nat;
  const utf8 appendInt_desc "(I)Ljava/lang/StringBuffer;";
  const nameandtype StringBuffer.appendInt_nat append_name,appendInt_desc;
  const methodref StringBuffer.appendInt StringBuffer,StringBuffer.appendInt_nat;

  //This has to be declared if you have code
  const utf8 Code_utf8 "Code";

  const utf8 main_name "main";
  const utf8 main_desc "([Ljava/lang/String;)V";

  const utf8 result_content "Result: ";
  const string resultStr result_content;

  const utf8 eol_content "\n";
  const string eol result_content;

  const int toSum 1000;


  //Methods

  //Constructor
  public method {
    name init0_name; 
    descriptor init0_desc;

    //Variables

    var object this;

    //Instructions

    aload this;
    invokespecial Object.init0;
    return;
  }

  //Main Method
  public static method {
    name main_name;
    descriptor main_desc;

    stackmap;

    //Variables

    var object args; //This is the method parameter

    //Instructions

    getstatic System.out;
    new StringBuffer;
    dup;
    invokespecial StringBuffer.init0;
    ldc resultStr;
    invokevirtual StringBuffer.appendObject;

    bipush 0;
    ldc toSum;

    loop:
    dup;
    bipush 0;
    if_icmpeq end;
    dup_x1;
    iadd;
    swap;
    bipush -1;
    iadd;
    goto loop;

    end:
    pop;
    invokevirtual StringBuffer.appendInt;

    invokevirtual PrintStream.println;

    return;
  }
}