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| public Interface Map<K,V>{
int size();
boolean isEmpty();
boolean constainsKey(Object key);
boolean containsValue(Object value);
V get(Object key);
V put(Object key,Object value);
V remove(Object key);
void putAll(Map<? extends K, ? extends V> m);
void clear();
Set<K> keySet();
Collection<V> values();
Set<Map.Entry<K,V>> entrySet();
Interface Entry<K,V> {
K getKey();
V getValue();
V setValue(V value);
boolean equals(Object o);
int hashCode();
public static <K extends Comparable<? super K> ,V> Comparator<Map.Entry<K,V> comparingByKey(){
return (Comparator<Map.Entry<K,V>> & Serializable) (c1,c2)->c1.getKey().compareTo(c2.getKey());
}
public static <K,V extends Comparable <? super V>> Comparator<Map.Entry<K,V>> comparingByValue(){
return (Comparator<Map.Entry<K,V>> & Serializable) (c1,c2) -> c1.getValue().compareTo(c2.getValue());
}
public static <K,V> Comparator<Map.Entry<K,V>> comparingByKey(Comparator<? super K> cmp){
Objects.requireNonNull(cmp);
return (Comparator<Map.Entry<K,V>> & Serializable)(c1,c2) -> cmp.compare(c1.getKey(),c2.getKey());
}
public static <K,V> Comparator<Map.Entry<K,V>> comparingByValue(Comparator<? super V> cmp){
Objects.requireNonNull(cmp);
return (Comparator<Map.Entry<K,V>> & Serializable)(c1,c2)->cmp.compare(c1.getValue(), c2.getValue());
}
}
boolean equals (Object o);
int hashCode();
default V getOrDefault(Object key , V defaultValue){
V v;
return (((v = get(key)) != null) || constainsKey(key))
? v
: defaultValue;
}
default void forEach(BiConsumer<? super K, ? super V> action){
Objects.requireNonNull(action);
for(Map.Entry<K,V> entry :entrySet()){
K k;
V v;
try{
k = entry.getKey();
v = entry.getValue();
} catch (IllegalStateException ise){
throw new ConcurrentModificationException(ise);
}
action.accept(k,v);
}
}
default void replaceAll(BiFunction<? super K, ? super V, ? extends V> function){
Objects.requireNonNull(function);
for(Map.Entry<K,V> entry : entrySet()){
K k;
V v;
try {
k = entry.getKey();
v = entry.getValue();
} catch (IllegalStateException ise){
throw new ConcurrentModificationException(ise);
}
v = function.apply(k,v);
try{
entry.setValue(v);
} catch(IllegalStateException ise){
throw new ConcurrentModificationException(ise);
}
}
}
default V putIfAbsent(K key, V value){
V v = get(key);
if( v== null){
v = put(key,value);
}
return v;
}
default boolean remove(Object key,Object value){
Object vurValue = get(key);
if(!Objects.equals(curValue ,value) ||
（curValue == null && !constainsKey(key)){
return false;
}
remove(key);
return true;
}
default boolean replace(K key,V oldValue, V newValue){
Object curValue = get(key);
if( !Objects.equals(curValue,oldValue) ||
(curValue == null && !containsKey(key))){
return false;
}
put(key,newValue);
return true;
}
default V replace(K key, V value){
V curValue;
if(((curValue = get(key)) != null) || containsKey(key)){
curValue = put(key,value);
}
return curValue
}
default V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction){
Objects.requireNonNull(mappingFunction);
V v;
if((v = get（key)) == null ){
V newValue
if((newValue = mappingFunction.apply(key)) != null) {
put(key, newValue);
return newValue;
}
}
return v;
}
default V computeIfPresent(K key,
BiFunction<? super K , ? super V, ? extends V> remappingFunction){
V oldValue;
if((oldValue = get(key)) != null){
V newValue = remappingFunction.apply(key,oldValue);
if(newValue != null){
put(key,newValue);
return newValue;
} else {
remove(key);
return null;
}
}
}
default V compute(K key,BiFunction<? super K, ? super V , ? extends V> remappingFunction){
Objects.requireNonNull(remappingFunction);
V newValue = remappingFunction.apply(key,oldValue);
if(newValue == null){
if(oldValue != null || containsKey(key)){
remove(key);
return null;
} else {
return null;
}
} else {
put(key,newValue);
return newValue;
}
}
default V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction){
Objects.requireNonNull(remappingFunction);
Objects.requireNonNull(value);
V oldValue = get(key);
V newValue = (oldValue == null ?) value : remappingFunction.apply(oldValue,value);
if(newValue == null){
remove(key);
} else {
put(key,newValue);
}
return newValue;
}
}
|