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. 
class com.google.common.base.CharMatcher$NegatedFastMatcher extends com.google.common.base.CharMatcher$Negated
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.base.CharMatcher$NegatedFastMatcher
  super_class: com.google.common.base.CharMatcher$Negated
{
  void <init>(com.google.common.base.CharMatcher);
    descriptor: (Lcom/google/common/base/CharMatcher;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.base.CharMatcher$NegatedFastMatcher this
        start local 1 // com.google.common.base.CharMatcher original
         0: .line 1152
            aload 0 /* this */
            aload 1 /* original */
            invokespecial com.google.common.base.CharMatcher$Negated.<init>:(Lcom/google/common/base/CharMatcher;)V
         1: .line 1153
            return
        end local 1 // com.google.common.base.CharMatcher original
        end local 0 // com.google.common.base.CharMatcher$NegatedFastMatcher this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    2     0      this  Lcom/google/common/base/CharMatcher$NegatedFastMatcher;
            0    2     1  original  Lcom/google/common/base/CharMatcher;
    MethodParameters:
          Name  Flags
      original  

  public final com.google.common.base.CharMatcher precomputed();
    descriptor: ()Lcom/google/common/base/CharMatcher;
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.base.CharMatcher$NegatedFastMatcher this
         0: .line 1157
            aload 0 /* this */
            areturn
        end local 0 // com.google.common.base.CharMatcher$NegatedFastMatcher this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/base/CharMatcher$NegatedFastMatcher;
}
SourceFile: "CharMatcher.java"
NestHost: com.google.common.base.CharMatcher
InnerClasses:
  private Negated = com.google.common.base.CharMatcher$Negated of com.google.common.base.CharMatcher
  NegatedFastMatcher = com.google.common.base.CharMatcher$NegatedFastMatcher of com.google.common.base.CharMatcher