https://openjdk.java.net/ 
public interface java.util.concurrent.Executor
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: java.util.concurrent.Executor
  super_class: java.lang.Object
{
  public abstract void execute(java.lang.Runnable);
    descriptor: (Ljava/lang/Runnable;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
         Name  Flags
      command  
}
SourceFile: "Executor.java"