Java歸併排序（遞歸實現）

--遞歸實現
public class HelloWorld {
        public static void showArray(int[] array){
                for(int i:array){
                        System.out.print(i);
                }
                System.out.println();
        }

        public static void main(String[] args) {
                int[] n={5,2,4,1,3,9,7,8,6};
                int[] tmp=new int[n.length];
                System.out.println();
                showArray(n);
                mergeSort(n,0,n.length-1,tmp);
                showArray(tmp);
                System.out.println();
        }

        public static void mergeSort(int[] array,int p,int r,int[] tmp){
                System.out.println("******mergeSort******");
                if(p>=r){return;}
                int q=p+(r-p)/2;
                mergeSort(array,p,q,tmp);
                mergeSort(array,q+1,r,tmp);
                merge(array,p,r,tmp);
        }

        public static void merge(int[] array,int p,int r,int[] tmp){
                int q,i,j,t;
                q=p+(r-p)/2;
                i=p;
                j=q+1;
                t=p;
                while(i<=q&&j<=r){
                        if(array[j]<array[i]){
                                tmp[t++]=array[j++];
                        }else{
                                tmp[t++]=array[i++];
                        }
                }
                while(i<=q){
                        tmp[t++]=array[i++];
                }
                while(j<=r){
                        tmp[t++]=array[j++];
                }
                for(i=p;i<=r;i++){
                        array[i]=tmp[i];
                }
        }

}

--非遞歸實現