policy-engine-study
Introduction
Kafka
Flink
Maven
- Local Maven Repository
Examples
Spring
- herbinate validator
  - @NotNull vs @NotEmpty vs @NotBlank
Antlr
- Install
录像
Drools
- Rete
  - call
  - Production Matching for Large Learning Systems
- API
  - stateless
  - stateful
Java 8
- util
  - Collection
    - List
      - ArrayList
        
        trimToSize()
        
        ensureCapacity(int minCapacity)
        
        int size()
        
        boolean isEmpty()
        
        boolean contains(Object o)
        
        int indexOf(Object o)
        
        int lastIndexOf(Object o)
        
        Object clone()
        
        Object[] toArray()
        
        T[] toArray(T[] a)
        
        E get(int index)
        
        E set(int index, E element)
        
        boolean add(E e)
        
        void add(int index, E element)
        
        E remove(int index)
        
        boolean remove(Object o)
        
        void clear()
        
        boolean addAll(Collection c)
        
        boolean addAll(int index, Collection c)
        
        boolean removeAll(Collection c)
        
        boolean retainAll(Collection c)
        
        ListIterator listIterator(int index)
        
        ListIterator listIterator()
        
        Iterator iterator()
        
        List subList(int fromIndex, int toIndex)
        
        void forEach(Consumer action)
        
        Spliterator spliterator()
        
        boolean removeIf(Predicate filter)
        
        void replaceAll(UnaryOperator operator)
        
        void sort(Comparator c)
      - LinkedList
        
        boolean addAll(Collection e)
        
        boolean addAll(int index, Collection c
        
        boolean add(E e)
        
        void add(int index, E element)
        
        void addFirst(E e)
        
        void addLast(E e)
        
        E getFirst()
        
        E getLast()
        
        E removeFirst()
        
        E removeLast()
        
        boolean remove(Object o)
        
        E remove(int index)
        
        boolean contains(Object o)
        
        int indexOf(Object o)
        
        int lastIndexOf(Object o)
        
        int size()
        
        void clear()
        
        E get(int index)
        
        E set(int index, E element)
        
        E peek()
        
        E element()
        
        E poll()
        
        E remove()
        
        boolean offer(E e)
        
        boolean offerFirst(E e)
        
        offerLast(E e)
        
        E peekFirst()
        
        E peekLast()
        
        E pollFirst()
        
        E pollLast()
        
        void push(E e)
        
        E pop()
        
        boolean removeFirstOccurrence(Object o)
        
        boolean removeLastOccurrence(Object o)
        
        ListIterator listIterator(int index)
        
        Iterator descendingIterator()
        
        Object clone()
        
        Object[] toArray()
        
        T[] toArray(T[] a)
        
        Spliterator spliterator()
      - Vector
        
        synchronized void copyInto(Object[] anArray)
        
        synchronized void trimToSize()
        
        synchronized void ensureCapacity(int minCapacity)
        
        synchronized void setSize(int newSize)
        
        synchronized int capacity()
        
        synchronized int size()
        
        synchronized boolean isEmpty()
        
        Enumeration elements()
        
        boolean contains(Object o)
        
        int indexOf(Object o)
        
        synchronized int indexOf(Object o, int index)
        
        synchronized int lastIndexOf(Object o)
        
        synchronized int lastIndexOf(Object o, int index)
        
        synchronized E elementAt(int index)
        
        synchronized E firstElement()
        
        synchronized E lastElement()
        
        synchronized void setElementAt(E obj, int index)
        
        synchronized void removeElementAt(int index)
        
        synchronized void insertElementAt(E obj, int index)
        
        synchronized void addElement(E obj)
        
        synchronized boolean removeElement(Object obj)
        
        synchronized void removeAllElements()
        
        synchronized Object clone()
        
        synchronized Object[] toArray()
        
        synchronized T[] toArray(T[] a)
        
        synchronized E get(int index)
        
        synchronized E set(int index, E element)
        
        synchronized boolean add(E e)
        
        boolean remove(Object o)
        
        void clear()
        
        synchronized boolean containsAll(Collection c)
        
        void add(int index, E element)
        
        synchronized E remove(int index)
        
        synchronized boolean addAll(Collection c)
        
        synchronized boolean removeAll(Collection c)
        
        synchronized boolean retainAll(Collection c)
        
        synchronized boolean addAll(int index, Collection c)
        
        synchronized boolean equals(Object o)
        
        synchronized int hashCode()
        
        synchronized String toString()
        
        synchronized List subList(int fromIndex, int toIndex)
        
        synchronized ListIterator listIterator(int index)
        
        synchronized ListIterator listIterator()
        
        synchronized Iterator iterator()
        
        synchronized void forEach(Consumer action)
        
        synchronized boolean removeIf(Predicate filter)
        
        synchronized void replaceAll(UnaryOperator operator)
        
        synchronized void sort(Comparator c)
        
        Spliterator spliterator()
    - Set
      - HashSet
        
        Iterator iterator()
        
        int size()
        
        boolean isEmpty()
        
        boolean contains(Object o)
        
        boolean add(E e)
        
        boolean remove(Object o)
        
        void clear()
        
        Object clone()
        
        Spliterator spliterator()
      - LinkedHashSet
        
        Spliterator spliterator()
      - TreeSet
        
        Iterator iterator()
        
        Iterator descendingIterator()
        
        NavigableSet descendingSet()
        
        int size()
        
        boolean isEmpty()
        
        boolean contains(Object o)
        
        boolean add(E e)
        
        boolean remove(Object o)
        
        void clear()
        
        boolean addAll(Collection c)
        
        NavigableSet subSet(E fromElement, boolean fromInclusive,E toElement, boolean toInclusive)
        
        NavigableSet headSet(E toElement, boolean inclusive)
        
        NavigableSet tailSet(E fromElement, boolean inclusive)
        
        SortedSet subSet(E fromElement, E toElement)
        
        SortedSet headSet(E toElement)
        
        SortedSet tailSet(E fromElement)
        
        Comparator comparator()
        
        E first()
        
        E last()
        
        E lower(E e)
        
        E floor(E e)
        
        E ceiling(E e)
        
        E higher(E e)
        
        E pollFirst()
        
        E pollLast()
        
        Object clone()
        
        Spliterator spliterator()
    - Queue
      - PriorityQueue
  - Map
    - HashMap
    - LinkedHashMap
      - boolean containsValue(Object value)
      - V get(Object key)
      - V getOrDefault(Object key, V defaultValue)
      - void clear()
      - Set keySet()
      - Collection values()
      - Set> entrySet()
      - void forEach(BiConsumer action)
      - void replaceAll(BiFunction function)
    - TreeMap
    - ConcurrentHashMap vs Hashtable
- akka
- extends vs super
- Thread
数据结构
- 红黑树

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Object[] toArray()

    public Object[] toArray() {
        return Arrays.copyOf(elementData, size);
    }

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