2、Java中有一个Arrays类,专门用来操作array。 arrays中拥有一组static函数,equals():比较两个array是否相等。array拥有相同元素个数,且所有对应元素两两相等。fill():将值填入array中。sort():用来对array进行排序。binarySearch():在排好序的array中寻找元素。System.arraycopy():array的复制。 二、Collection , ...
Stream.of(bk2)).toArray(b ->newBook[b]);for(Book b : bks) { System.out.println(b.getName()+", "+ b.getPrice()); }//Remove duplicates using distinct()System.out.println("--Remove duplicates using distinct()--"); bks = (Book[]) Stream.concat(Stream.of(bk1), Stream.of(bk...
sets.forEach(System.out::println); } //multiset 无序可重复 @Test public void guava6(){ HashMultiset<String> set = HashMultiset.create(); set.add("d"); set.add("d"); set.add("dd"); for(String s:set){ System.out.println(s+"->"+set.count(s));...
-flag name prints the name and value of the given command line flag. -flag [+|-]name enables or disables the given boolean command line flag. -flag name=value sets the given command line flag to the specified value. -flags prints command line flags passed to the JVM. pairs. -sysprops...
Sets HashSet:一个基于HashMap的Set实现。其中,所有的值为“假值”(同一个Object对象具备和HashMap同样的性能。基于这个特性,这个数据结构会消耗更多不必要的内存。 EnumSet:值为枚举类型的Set。Java的每一个enum都映射成一个不同的int。这就允许使用BitSet——一个类似的集合结构,其中每一比特都映射成不同的enum...
static voidsetBoolean(Objectarray, int index, boolean z) Sets the value of the indexed component of the specified array object to the specifiedbooleanvalue. static voidsetByte(Objectarray, int index, byte b) Sets the value of the indexed component of the specified array object to the specified...
容器相关的操作及其源码分析 说明 1、本文是基于JDK 7 分析的。JDK 8 待我工作了得好好研究下。Lambda、Stream。 2、因为个人能力有限,只能以模仿的形式+自...
The collections framework consists of: Collection interfaces. Represent different types of collections, such as sets, lists, and maps. These interfaces form the basis of the framework. General-purpose implementations. Primary implementations of the collection interfaces. ...
This algorithm offers O(n log(n)) performance on many data sets that cause other quicksorts to degrade to quadratic performance, and is typically faster than traditional (one-pivot) Quicksort implementations. Parameters: a - the array to be sorted sort public static void sort(int[] a, int...
升级 G1 GC 后,JVM 进程大小会有所增加(Remembered Sets、Collection Sets占用),需要注意应用内存...