$ javap -c -p -v demo.Generated     (the class GenerateDemo wrote; 25.0.5+8-LTS)
public class demo.Generated
  minor version: 0
  major version: 69
  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: #2                          // demo/Generated
  super_class: #6                         // java/lang/Object
  interfaces: 0, fields: 0, methods: 5, attributes: 0
Constant pool:
   #1 = Utf8               demo/Generated
   #2 = Class              #1             // demo/Generated
   #3 = Utf8               <init>
   #4 = Utf8               ()V
   #5 = Utf8               java/lang/Object
   #6 = Class              #5             // java/lang/Object
   #7 = NameAndType        #3:#4          // "<init>":()V
   #8 = Methodref          #6.#7          // java/lang/Object."<init>":()V
   #9 = Utf8               add
  #10 = Utf8               (II)I
  #11 = Utf8               hello
  #12 = Utf8               ()Ljava/lang/String;
  #13 = Utf8               Hello from generated bytecode
  #14 = String             #13            // Hello from generated bytecode
  #15 = Utf8               sumTo
  #16 = Utf8               (I)J
  #17 = Utf8               classify
  #18 = Utf8               (I)Ljava/lang/String;
  #19 = Utf8               negative
  #20 = String             #19            // negative
  #21 = Utf8               non-negative
  #22 = String             #21            // non-negative
  #23 = Utf8               Code
  #24 = Utf8               StackMapTable
  #25 = Utf8               java/lang/String
  #26 = Class              #25            // java/lang/String
{
  public demo.Generated();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: invokespecial #8                  // Method java/lang/Object."<init>":()V
         4: return

  public static int add(int, int);
    descriptor: (II)I
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=2, args_size=2
         0: iload_0
         1: iload_1
         2: iadd
         3: ireturn

  public static java.lang.String hello();
    descriptor: ()Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: ldc           #14                 // String Hello from generated bytecode
         2: areturn

  public static long sumTo(int);
    descriptor: (I)J
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=4, args_size=1
         0: lconst_0
         1: lstore_1
         2: iconst_1
         3: istore_3
         4: iload_3
         5: iload_0
         6: if_icmpgt     20
         9: lload_1
        10: iload_3
        11: i2l
        12: ladd
        13: lstore_1
        14: iinc          3, 1
        17: goto          4
        20: lload_1
        21: lreturn
      StackMapTable: number_of_entries = 2
        frame_type = 253 /* append */
          offset_delta = 4
          locals = [ long, int ]
        frame_type = 15 /* same */

  public static java.lang.String classify(int);
    descriptor: (I)Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
         0: iload_0
         1: ifge          9
         4: ldc           #20                 // String negative
         6: goto          11
         9: ldc           #22                 // String non-negative
        11: areturn
      StackMapTable: number_of_entries = 2
        frame_type = 9 /* same */
        frame_type = 65 /* same_locals_1_stack_item */
          stack = [ class java/lang/String ]
}