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Java-based LeetCode algorithm problem solutions, regularly updated

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2695\. Array Wrapper

Easy

Create a class `ArrayWrapper` that accepts an array of integers in its constructor. This class should have two features:

*   When two instances of this class are added together with the `+` operator, the resulting value is the sum of all the elements in both arrays.
*   When the `String()` function is called on the instance, it will return a comma separated string surrounded by brackets. For example, `[1,2,3]`.

**Example 1:**

**Input:** nums = [[1,2],[3,4]], operation = "Add"

**Output:** 10

**Explanation:** 

    const obj1 = new ArrayWrapper([1,2]); 
    const obj2 = new ArrayWrapper([3,4]); 
    obj1 + obj2; // 10

**Example 2:**

**Input:** nums = [[23,98,42,70]], operation = "String"

**Output:** "[23,98,42,70]"

**Explanation:** 

    const obj = new ArrayWrapper([23,98,42,70]); 
    String(obj); // "[23,98,42,70]"

**Example 3:**

**Input:** nums = [[],[]], operation = "Add"

**Output:** 0

**Explanation:** 
    
    const obj1 = new ArrayWrapper([]); 
    const obj2 = new ArrayWrapper([]); 
    obj1 + obj2; // 0

**Constraints:**

*   `0 <= nums.length <= 1000`
*   `0 <= nums[i] <= 1000`
*   `Note: nums is the array passed to the constructor`