https://openjdk.java.net/ 
public interface sun.management.counter.LongArrayCounter extends sun.management.counter.Counter
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: sun.management.counter.LongArrayCounter
  super_class: java.lang.Object
{
  public abstract long[] longArrayValue();
    descriptor: ()[J
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract long longAt(int);
    descriptor: (I)J
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      index  
}
SourceFile: "LongArrayCounter.java"