标签:归并 right Java temp int arr ++ 多线程 left
package cn.piggy;
import java.util.Arrays;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.ForkJoinTask;
import java.util.concurrent.RecursiveTask;
public class MergePiggy {
public static void main(String[] args) throws Exception {
int []arr = {9,8,7,6,5,4,3,2,1};
ForkJoinPool forkJoinPool = new ForkJoinPool();
CountTask countTask = new CountTask(0, arr.length-1, arr);
ForkJoinTask<int[]> submit = forkJoinPool.submit(countTask);
System.out.println(Arrays.toString(submit.get()));
}
}
class CountTask extends RecursiveTask<int[]>{
/**
*
*/
private static final long serialVersionUID = 1L;
private int left;
private int right;
private int[] array;
public CountTask(int left, int right, int[] array) {
super();
this.left = left;
this.right = right;
this.array = array;
}
@Override
protected int[] compute() {
if (right - left >= 3) {
int num = right+left;
int mid = num/2;
CountTask one = new CountTask(left, mid, array);
CountTask two = new CountTask(mid+1, right, array);
one.fork();
two.fork();
int[] join1 = one.join();
int[] join2 = two.join();
mergePiggy(join1,join2);
}else {
int []temp = new int[array.length];
sort(array,left,right,temp);
}
return array;
}
private int[] mergePiggy(int[] joinOne,int[]joinTwo) {
int[] arrayTemp = new int[right-left+1];
int mid = (right+left)/2;
int k = 0;
int i = left;
int j = mid+1;
while(i<=mid && j<=right) {
if(joinOne[i]<=joinTwo[j]) {
arrayTemp[k++] = joinOne[i++];
}else {
arrayTemp[k++] = joinTwo[j++];
}
}
while(i<=mid){
arrayTemp[k++] = joinOne[i++];
}
while(j<=right){
arrayTemp[k++] = joinTwo[j++];
}
k = 0;
for(int z=left; z<=right; z++) {
array[z] = arrayTemp[k];
k++;
}
return array;
}
private void sort(int[] arr,int left,int right,int []temp){
if(left<right){
int mid = (left+right)/2;
sort(arr,left,mid,temp);
sort(arr,mid+1,right,temp);
merge(arr,left,mid,right,temp);
}
}
private void merge(int[] arr,int left,int mid,int right,int[] temp){
int i = left;
int j = mid+1;
int t = 0;
while (i<=mid && j<=right){
if(arr[i]<=arr[j]){
temp[t++] = arr[i++];
}else {
temp[t++] = arr[j++];
}
}
while(i<=mid){
temp[t++] = arr[i++];
}
while(j<=right){
temp[t++] = arr[j++];
}
int k = 0;
//将temp中的元素全部拷贝到原数组中
while(left <= right){
arr[left++] = temp[k++];
}
}
}
标签:归并,right,Java,temp,int,arr,++,多线程,left 来源: https://blog.csdn.net/qq_43613152/article/details/120401351
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