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 interface com.google.common.collect.RowSortedTable<R, C, V> extends com.google.common.collect.Table<R, C, V>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.google.common.collect.RowSortedTable
  super_class: java.lang.Object
{
  public abstract java.util.SortedSet<R> rowKeySet();
    descriptor: ()Ljava/util/SortedSet;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: ()Ljava/util/SortedSet<TR;>;

  public abstract java.util.SortedMap<R, java.util.Map<C, V>> rowMap();
    descriptor: ()Ljava/util/SortedMap;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: ()Ljava/util/SortedMap<TR;Ljava/util/Map<TC;TV;>;>;

  public java.util.Map rowMap();
    descriptor: ()Ljava/util/Map;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokeinterface com.google.common.collect.RowSortedTable.rowMap:()Ljava/util/SortedMap;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public java.util.Set rowKeySet();
    descriptor: ()Ljava/util/Set;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokeinterface com.google.common.collect.RowSortedTable.rowKeySet:()Ljava/util/SortedSet;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <R:Ljava/lang/Object;C:Ljava/lang/Object;V:Ljava/lang/Object;>Ljava/lang/Object;Lcom/google/common/collect/Table<TR;TC;TV;>;
SourceFile: "RowSortedTable.java"
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtCompatible()