Package org.xyou.xcommon.seq

Class XSeq

  • public final class XSeq
extends java.lang.Object

    • Constructor Summary

      Constructors 
      Constructor Description
      XSeq()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static <V> java.util.Collection<V> addEleToCollectionIfNotNull​(java.util.Collection<V> coll, V ele)  
      static <V> void addNotNull​(java.util.Collection<V> coll, V ele)  
      static <V> java.util.List<V> distinct​(java.util.Collection<V> coll)  
      static boolean isEmpty​(java.lang.Object seq)  
      static <V> boolean isEmpty​(java.util.Collection<V> coll)  
      static <V,​T>
      java.util.List<T>      		 map​(java.util.Collection<V> coll, java.util.function.Function<V,​T> func)  
      static <V> V[] newArray​(V... arr)  
      static <V> java.util.List<V> newArrayList​(V... arrEle)  
      static <V> java.util.Set<V> newConcurrentHashSe​(java.lang.Iterable<? extends V> elements)  
      static <V> java.util.Set<V> newConcurrentHashSet()  
      static <V> java.util.Set<V> newHashSet​(V... arrEle)  
      static <V> V reduce​(java.util.Collection<V> coll, java.util.function.BiFunction<V,​V,​V> func)  
      static <V> java.util.List<V> shuffleLsLsByLsWeight​(java.util.List<java.util.List<V>> lsLs, java.util.List<java.lang.Double> lsWeight, int sizePartition)  
      static <V> java.util.List<V> shuffleLsTop​(java.util.List<V> lsItem, int numTop)  
      static <V> java.util.List<V> subLs​(java.util.List<V> ls, int sizeMax)  
      static <V> java.util.List<V> subLs​(java.util.List<V> ls, int idxStart, int count)  
      static <V extends java.lang.Number>
      double      		 sum​(java.util.Collection<V> coll)  

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • XSeq

        public XSeq()

    • Method Detail

      • newArray

        @SafeVarargs
public static <V> V[] newArray​(V... arr)

      • newArrayList

        @SafeVarargs
public static <V> java.util.List<V> newArrayList​(V... arrEle)

      • newHashSet

        @SafeVarargs
public static <V> java.util.Set<V> newHashSet​(V... arrEle)

      • newConcurrentHashSet

        public static <V> java.util.Set<V> newConcurrentHashSet()

      • newConcurrentHashSe

        public static <V> java.util.Set<V> newConcurrentHashSe​(java.lang.Iterable<? extends V> elements)

      • isEmpty

        public static boolean isEmpty​(java.lang.Object seq)

      • isEmpty

        public static <V> boolean isEmpty​(java.util.Collection<V> coll)

      • subLs

        public static <V> java.util.List<V> subLs​(java.util.List<V> ls,
                                          int idxStart,
                                          int count)

      • subLs

        public static <V> java.util.List<V> subLs​(java.util.List<V> ls,
                                          int sizeMax)

      • addNotNull

        public static <V> void addNotNull​(java.util.Collection<V> coll,
                                  V ele)

      • shuffleLsTop

        public static <V> java.util.List<V> shuffleLsTop​(java.util.List<V> lsItem,
                                                 int numTop)

      • shuffleLsLsByLsWeight

        public static <V> java.util.List<V> shuffleLsLsByLsWeight​(java.util.List<java.util.List<V>> lsLs,
                                                          java.util.List<java.lang.Double> lsWeight,
                                                          int sizePartition)

      • sum

        public static <V extends java.lang.Number> double sum​(java.util.Collection<V> coll)

      • distinct

        public static <V> java.util.List<V> distinct​(java.util.Collection<V> coll)

      • addEleToCollectionIfNotNull

        public static <V> java.util.Collection<V> addEleToCollectionIfNotNull​(java.util.Collection<V> coll,
                                                                      V ele)

      • map

        public static <V,​T> java.util.List<T> map​(java.util.Collection<V> coll,
                                                java.util.function.Function<V,​T> func)

      • reduce

        public static <V> V reduce​(java.util.Collection<V> coll,
                           java.util.function.BiFunction<V,​V,​V> func)