给定已经按降序排列的arr1和arr2，输出一个数组，该数组以降序附加来自arr1和arr2的值

尝试这种方式：

public static int[] join(int[] arr1,int[] arr2){        int[] joinArr=new int[arr1.length + arr2.length];        int i=0,j=0,k=0;        while(i<arr1.length && j<arr2.length){  // coping from both the array while one of them is exhausted if( arr1[i]>arr2[j]){     joinArr[k++]=arr1[i++]; // coping from arr1 and update the index i and k. }else if(arr1[i]<arr2[j]){     joinArr[k++]=arr2[j++]; // coping from arr2 and update the index j and k. }else{     joinArr[k++]=arr2[j++]; // coping from any of arr1  or arr2 and update the index i,j and k.      i++; }        }          if(i<arr1.length){  // coping from  the array arr1 since arr2 is exhausted  while(i<arr1.length ){      joinArr[k++]=arr1[i++];  }        }        if(j<arr2.length){  // coping from  the array arr2 since arr1 is exhausted  while(j<arr2.length ){      joinArr[k++]=arr2[j++];  }        }        return Arrays.copyOf(joinArr, k);    }