https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
interface com.google.common.cache.LongAddable
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.google.common.cache.LongAddable
  super_class: java.lang.Object
{
  public abstract void increment();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract void add(long);
    descriptor: (J)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      x     

  public abstract long sum();
    descriptor: ()J
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "LongAddable.java"
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtCompatible()