Modul speiger.src.collections
Package speiger.src.collections.bytes.maps.impl.misc

Klasse Byte2CharArrayMap

java.lang.Object
java.util.AbstractMap<Byte,Character>
speiger.src.collections.bytes.maps.abstracts.AbstractByte2CharMap
speiger.src.collections.bytes.maps.impl.misc.Byte2CharArrayMap
Alle implementierten Schnittstellen:
Map<Byte,Character>, Byte2CharFunction, Byte2CharMap, Byte2CharOrderedMap
public class Byte2CharArrayMap extends AbstractByte2CharMap implements Byte2CharOrderedMap
A Very Specific Type Specific implementation of a ArrayMap. This type of map is for very specific use cases that usaully would have lead to Tupled Lists otherwise. It also does not allow duplication (except for array constructors) and checks from last to first. It is not designed to be used as a HashMap replacement due to the poor performance it would cause.
Note:
in this implementation SubMaps do NOT keep track of parent changes fully. For performance reasons it will just have a start/end index and not values Anything within that range will be updated appropiatly a shrink/growth of elements will break SubMaps in some ways. This can be useful but be careful, this implementation does not shrink and only grows.

  • Konstruktordetails

    • Byte2CharArrayMap

      public Byte2CharArrayMap()
      Default Constructor

    • Byte2CharArrayMap

      public Byte2CharArrayMap(int minCapacity)
      Constructor that defines the minimum capacity
      Parameter:
      minCapacity - the minimum capacity the HashMap is allowed to be.
      Löst aus:
      IllegalStateException - if the minimum capacity is negative

    • Byte2CharArrayMap

      public Byte2CharArrayMap(Byte[] keys, Character[] values)
      Helper constructor that allow to create a map from boxed values (it will unbox them)
      Parameter:
      keys - the keys that should be put into the map
      values - the values that should be put into the map.
      Löst aus:
      IllegalStateException - if the keys and values do not match in length

    • Byte2CharArrayMap

      public Byte2CharArrayMap(Byte[] keys, Character[] values, int length)
      Helper constructor that allow to create a map from boxed values (it will unbox them) with a custom length
      Parameter:
      keys - the keys that should be put into the map
      values - the values that should be put into the map.
      length - the amount of values that should be pulled from the array
      Löst aus:
      IllegalStateException - if the keys and values do not match in length

    • Byte2CharArrayMap

      public Byte2CharArrayMap(byte[] keys, char[] values)
      Helper constructor that allow to create a map from unboxed values
      Parameter:
      keys - the keys that should be put into the map
      values - the values that should be put into the map.
      Löst aus:
      IllegalStateException - if the keys and values do not match in lenght

    • Byte2CharArrayMap

      public Byte2CharArrayMap(byte[] keys, char[] values, int length)
      Helper constructor that allow to create a map from unboxed values
      Parameter:
      keys - the keys that should be put into the map
      values - the values that should be put into the map.
      length - the amount of values that should be pulled from the array
      Löst aus:
      IllegalStateException - if the keys and values do not match in lenght

    • Byte2CharArrayMap

      public Byte2CharArrayMap(Map<? extends Byte,? extends Character> map)
      A Helper constructor that allows to create a Map with exactly the same values as the provided map.
      Parameter:
      map - the values that should be present in the map

    • Byte2CharArrayMap

      public Byte2CharArrayMap(Byte2CharMap map)
      A Type Specific Helper function that allows to create a new Map with exactly the same values as the provided map.
      Parameter:
      map - the values that should be present in the map

  • Methodendetails

    • put

      public char put(byte key, char value)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      Type Specific method to reduce boxing/unboxing of values
      Angegeben von:
      put in Schnittstelle Byte2CharMap
      Parameter:
      key - the key that should be inserted,
      value - the value that should be inserted
      Gibt zurück:
      the last present value or default return value.
      Siehe auch:

    • putIfAbsent

      public char putIfAbsent(byte key, char value)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      Type Specific method to reduce boxing/unboxing of values
      Angegeben von:
      putIfAbsent in Schnittstelle Byte2CharMap
      Parameter:
      key - the key that should be inserted,
      value - the value that should be inserted
      Gibt zurück:
      the last present value or default return value.
      Siehe auch:

    • addTo

      public char addTo(byte key, char value)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Helper method to add a primitives together. If key is not present then this functions as a put.
      Angegeben von:
      addTo in Schnittstelle Byte2CharMap
      Parameter:
      key - the key that should be inserted,
      value - the value that should be inserted / added
      Gibt zurück:
      the last present value or default return value.

    • subFrom

      public char subFrom(byte key, char value)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Helper method to subtract from primitive from each other. If the key is not present it will just return the defaultValue How the implementation works is that it will subtract from the current value (if not present it will do nothing) and fence it to the Byte2CharMap.getDefaultReturnValue() If the fence is reached the element will be automaticall removed
      Angegeben von:
      subFrom in Schnittstelle Byte2CharMap
      Parameter:
      key - that should be subtract from
      value - that should be subtract
      Gibt zurück:
      the last present or default return value

    • putAndMoveToFirst

      public char putAndMoveToFirst(byte key, char value)
      Beschreibung aus Schnittstelle kopiert: Byte2CharOrderedMap
      A customized put method that allows you to insert into the first index.
      Angegeben von:
      putAndMoveToFirst in Schnittstelle Byte2CharOrderedMap
      Parameter:
      key - the key that should be inserted
      value - the value that should be inserted
      Gibt zurück:
      the previous present or default return value
      Siehe auch:

    • putAndMoveToLast

      public char putAndMoveToLast(byte key, char value)
      Beschreibung aus Schnittstelle kopiert: Byte2CharOrderedMap
      A customized put method that allows you to insert into the last index. (This may be nessesary depending on the implementation)
      Angegeben von:
      putAndMoveToLast in Schnittstelle Byte2CharOrderedMap
      Parameter:
      key - the key that should be inserted
      value - the value that should be inserted
      Gibt zurück:
      the previous present or default return value
      Siehe auch:

    • moveToFirst

      public boolean moveToFirst(byte key)
      Beschreibung aus Schnittstelle kopiert: Byte2CharOrderedMap
      A specific move method to move a given key/value to the first index.
      Angegeben von:
      moveToFirst in Schnittstelle Byte2CharOrderedMap
      Parameter:
      key - that should be moved to the first index
      Gibt zurück:
      true if the value was moved.

    • moveToLast

      public boolean moveToLast(byte key)
      Beschreibung aus Schnittstelle kopiert: Byte2CharOrderedMap
      A specific move method to move a given key/value to the last index.
      Angegeben von:
      moveToLast in Schnittstelle Byte2CharOrderedMap
      Parameter:
      key - that should be moved to the first last
      Gibt zurück:
      true if the value was moved.

    • containsKey

      public boolean containsKey(byte key)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      Type Specific method to reduce boxing/unboxing of values
      Angegeben von:
      containsKey in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      containsKey in Klasse AbstractByte2CharMap
      Parameter:
      key - element that is searched for
      Gibt zurück:
      if the key is present

    • containsValue

      public boolean containsValue(char value)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      Type Specific method to reduce boxing/unboxing of values
      Angegeben von:
      containsValue in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      containsValue in Klasse AbstractByte2CharMap
      Parameter:
      value - element that is searched for
      Gibt zurück:
      if the value is present

    • containsKey

      public boolean containsKey(Object key)
      Angegeben von:
      containsKey in Schnittstelle Byte2CharMap
      Angegeben von:
      containsKey in Schnittstelle Map<Byte,Character>
      Setzt außer Kraft:
      containsKey in Klasse AbstractMap<Byte,Character>
      Parameter:
      key - that is searched for.
      Gibt zurück:
      true if found
      Siehe auch:

    • containsValue

      public boolean containsValue(Object value)
      Angegeben von:
      containsValue in Schnittstelle Byte2CharMap
      Angegeben von:
      containsValue in Schnittstelle Map<Byte,Character>
      Setzt außer Kraft:
      containsValue in Klasse AbstractMap<Byte,Character>
      Parameter:
      value - that is searched for.
      Gibt zurück:
      true if found
      Siehe auch:

    • get

      public char get(byte key)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Type Specific get method to reduce boxing/unboxing
      Angegeben von:
      get in Schnittstelle Byte2CharMap
      Parameter:
      key - the key that is searched for
      Gibt zurück:
      the searched value or default return value

    • getOrDefault

      public char getOrDefault(byte key, char defaultValue)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Type Specific getOrDefault method to reduce boxing/unboxing
      Angegeben von:
      getOrDefault in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      getOrDefault in Klasse AbstractByte2CharMap
      Parameter:
      key - the key that is searched for
      defaultValue - the value that should be returned if the key is not present
      Gibt zurück:
      the searched value or defaultValue value

    • getAndMoveToFirst

      public char getAndMoveToFirst(byte key)
      Beschreibung aus Schnittstelle kopiert: Byte2CharOrderedMap
      A Specific get method that allows to move teh given key/value int the first index.
      Angegeben von:
      getAndMoveToFirst in Schnittstelle Byte2CharOrderedMap
      Parameter:
      key - that is searched for
      Gibt zurück:
      the given value for the requested key or default return value

    • getAndMoveToLast

      public char getAndMoveToLast(byte key)
      Beschreibung aus Schnittstelle kopiert: Byte2CharOrderedMap
      A Specific get method that allows to move teh given key/value int the last index.
      Angegeben von:
      getAndMoveToLast in Schnittstelle Byte2CharOrderedMap
      Parameter:
      key - that is searched for
      Gibt zurück:
      the given value for the requested key or default return value

    • firstByteKey

      public byte firstByteKey()
      Beschreibung aus Schnittstelle kopiert: Byte2CharOrderedMap
      A method to get the first Key of a Map.
      Angegeben von:
      firstByteKey in Schnittstelle Byte2CharOrderedMap
      Gibt zurück:
      the first key in the map

    • lastByteKey

      public byte lastByteKey()
      Beschreibung aus Schnittstelle kopiert: Byte2CharOrderedMap
      A method to get the last Key of a Map.
      Angegeben von:
      lastByteKey in Schnittstelle Byte2CharOrderedMap
      Gibt zurück:
      the last key in the map

    • firstCharValue

      public char firstCharValue()
      Beschreibung aus Schnittstelle kopiert: Byte2CharOrderedMap
      A method to get the first Value of a Map.
      Angegeben von:
      firstCharValue in Schnittstelle Byte2CharOrderedMap
      Gibt zurück:
      the first key in the map

    • lastCharValue

      public char lastCharValue()
      Beschreibung aus Schnittstelle kopiert: Byte2CharOrderedMap
      A method to get the last Value of a Map.
      Angegeben von:
      lastCharValue in Schnittstelle Byte2CharOrderedMap
      Gibt zurück:
      the last key in the map

    • pollFirstByteKey

      public byte pollFirstByteKey()
      Beschreibung aus Schnittstelle kopiert: Byte2CharOrderedMap
      A method to get and remove the first Key of a Map.
      Angegeben von:
      pollFirstByteKey in Schnittstelle Byte2CharOrderedMap
      Gibt zurück:
      the first key in the map

    • pollLastByteKey

      public byte pollLastByteKey()
      Beschreibung aus Schnittstelle kopiert: Byte2CharOrderedMap
      A method to get and remove the last Key of a Map.
      Angegeben von:
      pollLastByteKey in Schnittstelle Byte2CharOrderedMap
      Gibt zurück:
      the last key in the map

    • remove

      public char remove(byte key)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      Type Specific remove function to reduce boxing/unboxing
      Angegeben von:
      remove in Schnittstelle Byte2CharMap
      Parameter:
      key - the element that should be removed
      Gibt zurück:
      the value that was removed or default return value

    • removeOrDefault

      public char removeOrDefault(byte key, char defaultValue)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      Type-Specific Remove function with a default return value if wanted.
      Angegeben von:
      removeOrDefault in Schnittstelle Byte2CharMap
      Parameter:
      key - the element that should be removed
      defaultValue - the value that should be returned if the entry doesn't exist
      Gibt zurück:
      the value that was removed or default value
      Siehe auch:

    • remove

      public boolean remove(byte key, char value)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      Type Specific remove function to reduce boxing/unboxing
      Angegeben von:
      remove in Schnittstelle Byte2CharMap
      Parameter:
      key - the element that should be removed
      value - the expected value that should be found
      Gibt zurück:
      true if the key and value was found and removed
      Siehe auch:

    • remove

      public Character remove(Object key)
      Angegeben von:
      remove in Schnittstelle Byte2CharMap
      Angegeben von:
      remove in Schnittstelle Map<Byte,Character>
      Setzt außer Kraft:
      remove in Klasse AbstractByte2CharMap
      Parameter:
      key - the element that should be removed
      Gibt zurück:
      the value that was removed or default return value
      Siehe auch:

    • remove

      public boolean remove(Object key, Object value)
      Angegeben von:
      remove in Schnittstelle Byte2CharMap
      Angegeben von:
      remove in Schnittstelle Map<Byte,Character>
      Parameter:
      key - the element that should be removed
      value - the expected value that should be found
      Gibt zurück:
      true if the key and value was found and removed
      Siehe auch:

    • forEach

      public void forEach(ByteCharConsumer action)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      Type Specific forEach method to reduce boxing/unboxing
      Angegeben von:
      forEach in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      forEach in Klasse AbstractByte2CharMap
      Parameter:
      action - processor of the values that are iterator over

    • keySet

      public ByteOrderedSet keySet()
      Angegeben von:
      keySet in Schnittstelle Byte2CharMap
      Angegeben von:
      keySet in Schnittstelle Byte2CharOrderedMap
      Angegeben von:
      keySet in Schnittstelle Map<Byte,Character>
      Setzt außer Kraft:
      keySet in Klasse AbstractByte2CharMap

    • values

      public CharCollection values()
      Angegeben von:
      values in Schnittstelle Byte2CharMap
      Angegeben von:
      values in Schnittstelle Map<Byte,Character>
      Setzt außer Kraft:
      values in Klasse AbstractByte2CharMap

    • byte2CharEntrySet

      public ObjectOrderedSet<Byte2CharMap.Entry> byte2CharEntrySet()
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      Type Sensitive EntrySet to reduce boxing/unboxing and optionally Temp Object Allocation.
      Angegeben von:
      byte2CharEntrySet in Schnittstelle Byte2CharMap
      Angegeben von:
      byte2CharEntrySet in Schnittstelle Byte2CharOrderedMap
      Gibt zurück:
      a EntrySet of the collection

    • replace

      public boolean replace(byte key, char oldValue, char newValue)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Type Specific replace method to replace an existing value
      Angegeben von:
      replace in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      replace in Klasse AbstractByte2CharMap
      Parameter:
      key - the element that should be searched for
      oldValue - the expected value to be replaced
      newValue - the value to replace the oldValue with.
      Gibt zurück:
      true if the value got replaced

    • replace

      public char replace(byte key, char value)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Type Specific replace method to reduce boxing/unboxing replace an existing value
      Angegeben von:
      replace in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      replace in Klasse AbstractByte2CharMap
      Parameter:
      key - the element that should be searched for
      value - the value to replace with.
      Gibt zurück:
      the present value or default return value

    • computeChar

      public char computeChar(byte key, ByteCharUnaryOperator mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Type Specific compute method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      computeChar in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      computeChar in Klasse AbstractByte2CharMap
      Parameter:
      key - the key that should be computed
      mappingFunction - the operator that should generate the value
      Gibt zurück:
      the result of the computation

    • computeCharIfAbsent

      public char computeCharIfAbsent(byte key, Byte2CharFunction mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Type Specific computeIfAbsent method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      computeCharIfAbsent in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      computeCharIfAbsent in Klasse AbstractByte2CharMap
      Parameter:
      key - the key that should be computed
      mappingFunction - the operator that should generate the value if not present
      Gibt zurück:
      the result of the computed value or present value

    • supplyCharIfAbsent

      public char supplyCharIfAbsent(byte key, CharSupplier valueProvider)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Supplier based computeIfAbsent function to fill the most used usecase of this function If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      supplyCharIfAbsent in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      supplyCharIfAbsent in Klasse AbstractByte2CharMap
      Parameter:
      key - the key that should be computed
      valueProvider - the value if not present
      Gibt zurück:
      the result of the computed value or present value

    • computeCharIfPresent

      public char computeCharIfPresent(byte key, ByteCharUnaryOperator mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Type Specific compute method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      computeCharIfPresent in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      computeCharIfPresent in Klasse AbstractByte2CharMap
      Parameter:
      key - the key that should be computed
      mappingFunction - the operator that should generate the value if present
      Gibt zurück:
      the result of the default return value or present value

    • computeCharNonDefault

      public char computeCharNonDefault(byte key, ByteCharUnaryOperator mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Type Specific compute method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      computeCharNonDefault in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      computeCharNonDefault in Klasse AbstractByte2CharMap
      Parameter:
      key - the key that should be computed
      mappingFunction - the operator that should generate the value
      Gibt zurück:
      the result of the computation

    • computeCharIfAbsentNonDefault

      public char computeCharIfAbsentNonDefault(byte key, Byte2CharFunction mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Type Specific computeIfAbsent method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      computeCharIfAbsentNonDefault in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      computeCharIfAbsentNonDefault in Klasse AbstractByte2CharMap
      Parameter:
      key - the key that should be computed
      mappingFunction - the operator that should generate the value if not present
      Gibt zurück:
      the result of the computed value or present value

    • supplyCharIfAbsentNonDefault

      public char supplyCharIfAbsentNonDefault(byte key, CharSupplier valueProvider)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Supplier based computeIfAbsent function to fill the most used usecase of this function If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      supplyCharIfAbsentNonDefault in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      supplyCharIfAbsentNonDefault in Klasse AbstractByte2CharMap
      Parameter:
      key - the key that should be computed
      valueProvider - the value if not present
      Gibt zurück:
      the result of the computed value or present value

    • computeCharIfPresentNonDefault

      public char computeCharIfPresentNonDefault(byte key, ByteCharUnaryOperator mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Type Specific compute method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      computeCharIfPresentNonDefault in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      computeCharIfPresentNonDefault in Klasse AbstractByte2CharMap
      Parameter:
      key - the key that should be computed
      mappingFunction - the operator that should generate the value if present
      Gibt zurück:
      the result of the default return value or present value

    • mergeChar

      public char mergeChar(byte key, char value, CharCharUnaryOperator mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Type Specific merge method to reduce boxing/unboxing If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      mergeChar in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      mergeChar in Klasse AbstractByte2CharMap
      Parameter:
      key - the key that should be be searched for
      value - the value that should be merged with
      mappingFunction - the operator that should generate the new Value
      Gibt zurück:
      the result of the merge

    • mergeAllChar

      public void mergeAllChar(Byte2CharMap m, CharCharUnaryOperator mappingFunction)
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Bulk method for merging Maps. If the generated value equals the getDefaultReturnValue it will simply not insert it since that is treated as "null". A "Null Value" will be treated as "Do not insert/remove" based on how the Java has specified it.
      Angegeben von:
      mergeAllChar in Schnittstelle Byte2CharMap
      Setzt außer Kraft:
      mergeAllChar in Klasse AbstractByte2CharMap
      Parameter:
      m - the entries that should be bulk added
      mappingFunction - the operator that should generate the new Value

    • size

      public int size()
      Angegeben von:
      size in Schnittstelle Map<Byte,Character>
      Setzt außer Kraft:
      size in Klasse AbstractMap<Byte,Character>

    • clear

      public void clear()
      Angegeben von:
      clear in Schnittstelle Map<Byte,Character>
      Setzt außer Kraft:
      clear in Klasse AbstractMap<Byte,Character>

    • copy

      public Byte2CharArrayMap copy()
      Beschreibung aus Schnittstelle kopiert: Byte2CharMap
      A Function that does a shallow clone of the Map itself. This function is more optimized then a copy constructor since the Map does not have to be unsorted/resorted. It can be compared to Cloneable but with less exception risk
      Angegeben von:
      copy in Schnittstelle Byte2CharMap
      Angegeben von:
      copy in Schnittstelle Byte2CharOrderedMap
      Setzt außer Kraft:
      copy in Klasse AbstractByte2CharMap
      Gibt zurück:
      a Shallow Copy of the Map