概述

主要谈一谈 Java使用fork/koin类 实现的并发排序 以及对于Stream流的支持的splitetor

mismatch() -> 寻找两个数组 第一次出现数据不一致的下标

parallelPrefix() -> 对数组进行,累加求和

parallelSetAll() -> 对数组进行置数,

parallelSort() -> 并行排序

Spliterator() -> 对数组进行切分(切分后的数据为所有的数据的组合)

奇数 x/2+1 11->6

偶数 x/2 10 ==>5

public class Use_Arrays {

@Test

public void test_mismatch() {

int []x =new int[] {1,2,3,4};

int []y =new int[] {1,3,4,5};

int index = Arrays.mismatch(x, y);

System.out.println(index);

}

@Test

public void test_parallelPrefix() {

int []x =new int[] {1,2,3,4};

//f2=f1+f2

//f3=f2+f3

Arrays.parallelPrefix(x, (k,v)->k+v);

System.out.println(Arrays.toString(x));

// 实现1-100累加求和

int []y =new int[100];

Arrays.parallelSetAll(y, k->k=1);

Arrays.parallelPrefix(y, (k,v)->k+v);

System.out.println(Arrays.toString(y));

}

@Test

public void test_parallelSetAll() {

int []x =new int[100];

x[0]=1;

Arrays.parallelSetAll(x, y->y+1);

System.out.println(Arrays.toString(x));

}

@Test

public void test_parallSort() {

IntStream stream = new Random().ints(0, 1000).limit(1000);

int[] array = stream.toArray();

System.out.println(Arrays.toString(array));

Arrays.parallelSort(array);

System.out.println(Arrays.toString(array));

}

@Test

public void test_spliterator() {

int []x =new int[11];

Arrays.parallelSetAll(x, k->k+=1);

System.out.println(Arrays.toString(x));

Spliterator.OfInt int0_100 = Arrays.spliterator(x);

int [] y=new int[(int) int0_100.estimateSize()];

int i=0;

System.out.println(int0_100.estimateSize());

System.out.println(int0_100.characteristics());

System.out.println(int0_100.getExactSizeIfKnown());

//spliterator.forEachRemaining((int k)->System.out.println(k));

OfInt int1_50 = int0_100.trySplit();

OfInt int2_25 = int1_50.trySplit();

int0_100.forEachRemaining((int k)->System.out.print(k+" "));

System.out.println();

int1_50.forEachRemaining((int k)->System.out.print(k+" "));

System.out.println();

int2_25.forEachRemaining((int k)->System.out.print(k+" "));

}

}

2:使用Spliterator实现并行输出

@Test

public void definied_Sort() {

IntStream stream = new Random().ints(0, 100).limit(100);

int[] array = stream.toArray();

Arrays.sort(array);

final int NUMS=3;// 切分的次数

ExecutorService thread_pool = Executors.newFixedThreadPool(10);

Spliterator.OfInt cut1 = Arrays.spliterator(array);

while(!thread_pool.isTerminated()) {

thread_pool.submit(()->{

OfInt split = cut1.trySplit();

thread_pool.shutdown();

split.forEachRemaining((int k)->System.out.print(k+" "));

System.out.println();

});

}

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。