2、往数组int array[] = {1,2,3,4,5,6,7}第3个位置插入一个数8,最后的结果应该为{1,2,3,8,4,5,6,7}

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采用循环（未使用Java API）

public static void main(String[] args) {        /*         * 2、往数组int array[] = {1,2,3,4,5,6,7}         * 第3个位置插入一个数8,最后的结果应该为{1,2,3,8,4,5,6,7}         */        int array[] = {1,2,3,4,5,6,7};        int arr[] = new int[array.length+1];        Scanner sc = new Scanner(System.in);        System.out.print("请输入要插入的整数：");        int number = sc.nextInt();        for (int i = 0; i < array.length; i++) {            arr[i] = array[i];        }        for (int i = arr.length-1; i >=4; i--) {            int temp = arr[i];            arr[i] = arr[i-1];            arr[i-1] = temp;            if(i==4){                arr[i-1] = number;            }        }        for(int i = 0; i < arr.length; i++){            System.out.println(arr[i]);        }    }

利用集合的方式：

public static void main(String[] args) {        ArrayList<Integer> list = new ArrayList<>();//      int array[] = {1,2,3,4,5,6,7};//      list.add(array);        list.add(1);        list.add(2);        list.add(3);        list.add(4);        list.add(5);        list.add(6);        list.add(7);        System.out.println(list);//      ArrayList list2 = new ArrayList();//      list2.add(8);//      list.addAll(3, list2);        list.add(3, 8);        System.out.println(list);        //遍历方法一：        for (int i = 0; i < list.size(); i++) {            Object obj = list.get(i);            System.out.print(obj + ", ");        }        System.out.println();        //遍历方法二：        for (Object object : list) {            System.out.print(object + ", ");        }        System.out.println();        //遍历方法三：        Iterator it = list.iterator();        while(it.hasNext()){            Object obj = it.next();            System.out.print(obj + ", ");        }        System.out.println();    }

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