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Java-based LeetCode algorithm problem solutions, regularly updated

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2888\. Reshape Data: Concatenate

Easy

DataFrame `df1` 

    +-------------+--------+ 
    | Column Name | Type   | 
    +-------------+--------+ 
    | student_id  | int    | 
    | name        | object | 
    | age         | int    | 
    +-------------+--------+ 

DataFrame `df2` 
    
    +-------------+--------+ 
    | Column Name | Type   | 
    +-------------+--------+ 
    | student_id  | int    | 
    | name        | object | 
    | age         | int    | 
    +-------------+--------+

Write a solution to concatenate these two DataFrames **vertically** into one DataFrame.

The result format is in the following example.

**Example 1:**

**Input: df1** 

    +------------+---------+-----+ 
    | student_id | name    | age | 
    +------------+---------+-----+ 
    | 1          | Mason   | 8   | 
    | 2          | Ava     | 6   | 
    | 3          | Taylor  | 15  | 
    | 4          | Georgia | 17  | 
    +------------+---------+-----+ 

**df2** 

    +------------+------+-----+ 
    | student_id | name | age | 
    +------------+------+-----+ 
    | 5          | Leo  | 7   | 
    | 6          | Alex | 7   | 
    +------------+------+-----+

**Output:** 

    +------------+---------+-----+ 
    | student_id | name    | age | 
    +------------+---------+-----+ 
    | 1          | Mason   | 8   | 
    | 2          | Ava     | 6   | 
    | 3          | Taylor  | 15  | 
    | 4          | Georgia | 17  | 
    | 5          | Leo     | 7   | 
    | 6          | Alex    | 7   | 
    +------------+---------+-----+

**Explanation:** The two DataFramess are stacked vertically, and their rows are combined.