https://openjdk.java.net/projects/openjfx/javafx-graphics/: OpenJFX JavaFX
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public interface com.sun.javafx.runtime.async.AsyncOperation
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.javafx.runtime.async.AsyncOperation
  super_class: java.lang.Object
{
  public abstract void start();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract void cancel();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract boolean isCancelled();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract boolean isDone();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "AsyncOperation.java"