二路归并，解决JAVA合并两个有序数组(时间复杂度O(n))

 public static void main(String[] args) {
        Random rand = new Random();
        int[] arr1 = new int[10];
        int[] arr2 = new int[15];
        for(int i = 0; i < 10; i++) {
            arr1[i] = rand.nextInt(50)+1;
        }
        Arrays.sort(arr1);
        for(int i = 0; i < 15; i++) {
            arr2[i] = rand.nextInt(50)+1;
        }
        Arrays.sort(arr2);

        /*---------以下是核心代码，对上面两个有序数组进行二路归并a*/
        int i = 0;
        int j = 0;
        int k = 0;
        int len = arr1.length + arr2.length;
        int[] arr = new int[len];
        while(i<arr1.length && j<arr2.length) {
            if(arr1[i]<=arr2[j]) {
                arr[k++] = arr1[i++];
            }else {
                arr[k++] = arr2[j++];
            }
        }
        if(i==arr1.length && j<arr2.length) {
            while(j<arr2.length) {
                arr[k++] = arr2[j++];
            }
        }
        if(j==arr2.length && i<arr1.length) {
            while(i < arr1.length) {
                arr[k++] = arr1[i++];
            }
        }
        String str = Arrays.toString(arr);
        System.out.println(str);
    }