https://openjdk.java.net/ 
public interface com.sun.java_cup.internal.runtime.Scanner
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.java_cup.internal.runtime.Scanner
  super_class: java.lang.Object
{
  public abstract com.sun.java_cup.internal.runtime.Symbol next_token();
    descriptor: ()Lcom/sun/java_cup/internal/runtime/Symbol;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.lang.Exception
}
SourceFile: "Scanner.java"