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. 
public abstract class com.google.common.base.Ticker
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.google.common.base.Ticker
  super_class: java.lang.Object
{
  private static final com.google.common.base.Ticker SYSTEM_TICKER;
    descriptor: Lcom/google/common/base/Ticker;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 52
            new com.google.common.base.Ticker$1
            dup
            invokespecial com.google.common.base.Ticker$1.<init>:()V
         1: .line 51
            putstatic com.google.common.base.Ticker.SYSTEM_TICKER:Lcom/google/common/base/Ticker;
         2: .line 57
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  protected void <init>();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.base.Ticker this
         0: .line 36
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.google.common.base.Ticker this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/base/Ticker;

  public abstract long read();
    descriptor: ()J
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    RuntimeInvisibleAnnotations: 
      com.google.errorprone.annotations.CanIgnoreReturnValue()

  public static com.google.common.base.Ticker systemTicker();
    descriptor: ()Lcom/google/common/base/Ticker;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 48
            getstatic com.google.common.base.Ticker.SYSTEM_TICKER:Lcom/google/common/base/Ticker;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
SourceFile: "Ticker.java"
NestMembers:
  com.google.common.base.Ticker$1
InnerClasses:
  com.google.common.base.Ticker$1
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.Beta()
      com.google.common.annotations.GwtCompatible()